MCH 6 EM Explorer Nitrox - Submarine Manufacturing and Products ...

Special equipment and compressors for underwater activities
MCH 6/EM EXPLORER NITROX MCH
6/ET EXPLORER NITROX
MCH 6/SH EXPLORER NITROX
VERSION: English
INSTRUCTION
MANUAL
Revision:
DOC MCH 6/EM-ET-SH EXPLORER NITROX-04-04

USE IN BRIEF
Use in brief ..................................................................................................................................... 7
1
GUARANTEE AND ASSISTANCE
1.1 Garantee .............................................................................................................................. 9
1.2 Assistance........................................................................................................................... 9
2
TECHNICAL DESCRIPTION
2.1 Operating principle ............................................................................................................... 12
2.2 Description of the pump unit .................................................................................................13
2.2.1 Monobloc unit .............................................................................................................14
2.2.2 Head unit .................................................................................................................... 16
2.2.3 Safety valves ............................................................................................................... 16
2.2.4 Lubrication unit ............................................................................................................ 17
2.2.5 Pressure maintenance valve ........................................................................................ 17
2.2.6 Cooling pipes .............................................................................................................. 17
2.2.7 Filters.......................................................................................................................... 18
2.2.8 Frame and sound-proofed casing................................................................................. 19
2.3 Machine control ................................................................................................................... 19
3 TECHNICAL CHARACTERISTICS
3.1 Technical characteristics of the pump unit ............................................................................ 20
3.1.1 Technical characteristics “MCH6” ................................................................................ 21
3.1.2 Sizes and weights ....................................................................................................... 22
3.2 Noise ................................................................................................................................... 23
4
PRECAUTIONS FOR USE AND MAINTENANCE
4.1 Machine area diagrams ........................................................................................................ 25
4.1.1 Safety devices ............................................................................................................. 26
4.1.2 Residual risk areas ..................................................................................................... 28
2
Index

UNPACKING AND HANDLING THE MACHINE
5
5.1 Unpacking the machine........................................................................................................ 29
5.2 Pack contents...................................................................................................................... 29
5.3 Handling the machine........................................................................................................... 30
INSTALLATION
6
6.1 Positioning ........................................................................................................................... 31
6.2 Connections ......................................................................................................................... 32
6.2.1 Connecting the air intake extension............................................................................. 32
6.2.2 Connecting the refill hoses .......................................................................................... 35
6.2.3 Electrical connection for models MCH 6/EM and MCH 6/ET........................................ 35
CONTROL PANEL
7
7.1 Control panel ....................................................................................................................... 37
7.1.1 Wall-mounted control panel for models with electric power supply (optional) ...............38
7.1.2 Controls on board the internal combustion engines ..................................................... 39
7.2 Indication and control devices .............................................................................................. 40
START AND STOP
8
8.1 Filling the machine ............................................................................................................... 41
8.2 Checks ................................................................................................................................ 43
8.2.1 Models with electric power supply ............................................................................... 43
8.2.2 Models with petrol supply ............................................................................................ 45
8.2.3 Calibrate analyzer ....................................................................................................... 49
8.2.4 Stop ........................................................................................................................... 50
USE
9
9.1 Preliminary operations ......................................................................................................... 53
9.2 Refilling the cylinders ........................................................................................................... 55
Index
3

10
PUTTING THE MACHINE OUT OF OPERATION
AND DISMANTLING THE MACHIN
10.1 Instructions for prolonged machine standstills ...................................................................... 58
10.2 Disposal of waste products ..................................................................................................61
10.3 Dismantling the machine ...................................................................................................... 61
11
MAINTENANCE
11.1 General notes ...................................................................................................................... 64
11.2 Preventive maintenance ........................................................................................................ 64
11.3 Changing the lubricant oil ..................................................................................................... 65
11.4 Transmission belt ................................................................................................................. 66
11.4.1 Checking the transmission belt.................................................................................. 66
11.4.2 Disassembling the belt to be replaced ....................................................................... 67
11.5 Air intake filter ...................................................................................................................... 68
11.6 Active carbon filter and molecular sieve ................................................................................ 69
11.7 Refill hose ............................................................................................................................ 70
11.8 Intake and discharge valves .................................................................................................. 71
11.9 Condensate discharge ......................................................................................................... 71
11.10 Cylinders.............................................................................................................................. 71
11.11 Internal combustion engines................................................................................................. 71
11.11.1 Maintenance programme .......................................................................................... 72
11.11.2 Oil change ............................................................................................................... 72
11.11.3 Air filter .................................................................................................................... 73
11.11.4 Sediment sump........................................................................................................ 74
11.11.5 Spark plugs .............................................................................................................. 75
11.11.6Minimum carburettor regulation ................................................................................ 77
11.11.7Fuel filter ................................................................................................................... 77
11.12 Check of safety devices ....................................................................................................... 78
11.12.1 Check of the safety valve ......................................................................................... 79
11.13 Maintenance operations ....................................................................................................... 79
12
TROUBLESHOOTING
12.1 List of faults ......................................................................................................................... 81
4
Index

REGISTERS
13
13.1 Machine log book ................................................................................................................. 83
MACHINE DIAGRAMS
14
14.1 NITROX compression diagram .............................................................................................. 84
14.2 Compression diagram - only air ............................................................................................ 85
14.2 Electricals diagrams ............................................................................................................ 63
SPARE PARTS
15
15.1 Exploded view of the machine parts .................................................................................... 87
Pumping unit ...................................................................................................................... 88
MCH 6/EM EXPLORER NITROX and MCH 6/ET EXPLORER NITROX cooling plant frame ............ 90
MCH 6/SH EXPLORER NITROX cooling plant frame ........................................................... 92
Active carbon filter and condensate separator..................................................................... 94
ANNEXES - MINI O2DII
16
16.1 Introduction ......................................................................................................................... 96
16.2 Controls .............................................................................................................................. 97
16.3 Air calibration ...................................................................................................................... 97
16.4 Operation ............................................................................................................................ 98
16.5 Accessories ........................................................................................................................ 98
16.6 Troubleshooting ................................................................................................................... 99
16.7 Maintenance ....................................................................................................................... 99
16.8 Care of the Mini O2DII ....................................................................................................... 100
16.9 Safety information for the Mini O2DII ................................................................................. 100
16.10 Informaton on handling of the sensor ................................................................................. 101
16.11 Details .............................................................................................................................. 101
Index
5

To make the manual easier to read, the following terms have been adopted:
DANGER
The term DANGER is used when failure to comply with the regulations or tampering with the
parts could lead to serious injury or even death.
CAUTION
The term WARNING is used when failure to comply with the instructions could cause damage to the
machine and other parts associated with the same or to the surrounding area.
LABEL APPLIED TO THE COMPRESSORS
To protect exposed persons or objects, a special booklet entitled “SAFETY REGULATIONS” is supplied
with the machine and must be considered an integral part of the Compressor Instruction Manual.
Editor’s note:this manual refers specifically to the “MCH 6 EXPLORER NITROX” series of refill stations
which, as later explained, may be supplied in various arrangements although they all
work on the same operating principle.
For this reason, the illustrations given in the Instruction Manual should be considered
only as indications insofar as they refer to just one version of refill station in the
“MCH 6 EXPLORER NITROX” series.
This manual is the property of AEROTECNICA COLTRI S.r.l. and any copying of the same, even partial, is
prohibited.
6
Introduction

USE IN BRIEF
The following information must be referred to and applied only when this manual and the
“Safety regulations” manual have been read and their contents have been understood and
assimilated.
VERSION WITH ELECTRIC ENGINE
(MCH 6/EM EXPLORER NITROX and MCH 6/ET EXPLORER NITROX)
- Check whether or not the area where the machine is installed has suitable ventilation
(see chapter 6.1).
- If the machine is installed in a place without the required characteristics above, connect the air
intake extension (see chapter 6.2.1).
- Connect the refill hoses to the machine (see chapter 6.2.2).
- Connect the switchboard to the mains power supply (see chapter 6.2.3).
- Check the level of the lubricating oil in the pump unit (see chapter 8.2). If the level is too low, turn off
the machine and add or change the oil (see chapter 8.1).
- Turn on the machine using the main switch (see chapter 7.1).
- Check the direction of rotation of the motor. If the direction of rotation does not coincide with the one
shown on the belt guard, turn off the machine and invert the two phases on the main power supply
(see chapter 7.2).
- Check the operation of the safety valve (see chapter 9.1).
- Check for wear on the cylinders to be filled (see chapter 9.1).
- Fit the hose attachment on the cylinder and check that the taps on the hose are open
(see chapter 9.2).
- Turn on the cylinder tap and start up the compressor (see chapter 9.2).
- When the filling operation has been completed, the compressor is stopped automatically by the
pressure switch, turn off the cylinder and the hose taps.
- Press the pressure bleed button and disconnect the cylinder attachment (see chapter 9.2).
Use in brief
7

USE IN BRIEF
The following information must be referred to and applied only when this manual and the
“Safety regulations” manual have been read and their contents have been understood and
assimilated.
VERSION WITH PETROL ENGINE (MCH 6/SH EXPLORER NITROX )
- Check whether or not the area where the machine is installed has suitable ventilation
(see chapter 6.1).
- If the machine is installed in a place without the required characteristics above, connect the air
intake extension (see chapter 6.2.1).
- Connect the refill hoses to the machine (see chapter 6.2.2).
- Check the level of the lubricating oil in the pump unit (see chapter 8.2). If the level is too low, turn off
the machine and add or change the oil (see chapter 8.1).
- Check the oil level of the internal combustion engine using the dipstick provided (see chapter 11.11.2).
- Add fuel to the tank (unleaded petrol of the recommended type).
- Check the operation of the safety valve (see chapter 9.1).
- Check for wear on the cylinders to be filled (see chapter 9.1).
- Fit the hose attachment on the cylinder and check that the taps on the hose are open
(see chapter 9.2).
- Turn on the cylinder tap and start up the compressor (see chapter 9.2).
- When the filling operation has been completed, the compressor is stopped automatically by the
pressure switch, turn off the cylinder and the hose taps.
- Press the pressure bleed button and disconnect the cylinder attachment (see chapter 9.2).
- Move the fuel lever to the “open” position (in an anti-clockwise direction).
- Move the air lever to the “closed” position (in a clockwise direction).
- Turn the accelerator lever slightly in an anti-clockwise direction.
- Move the engine start switch to the “ON” position.
- Pull the starter cord until a certain resistance is felt, then pull hard.
STOPPING THE ENGINE
In an emergency, simply move the engine switch to the “OFF” position.
To stop the engine under normal circumstances:
- turn the accelerator lever in an anti-clockwise direction as far as it will go;
- move the engine switch to “OFF”;
- move the fuel lever to “OFF” (in a clockwise direction).
8
Use in brief

GUARANTEE AND ASSISTANCE
1
Guarantee
1.1
AEROTECNICA COLTRI S.r.l. guarantees its compressors against any design or manufacturing
defect or fault and against any fault in the materials for a period of 24 months from the delivery of the
machine. The customer must inform AEROTECNICA COLTRI S.r.l. in writing of any fault and/or defect
that may be found within eight days from its discovery by means of a registered letter with advice of
receipt or telegramme, otherwise the guarantee will become null and void.
The guarantee is only valid against faults or defects that may arise with the compressor used under
proper operating conditions according to the instructions given in this manual and with the maintenance
carried out at the intervals as provided for.
The guarantee expressly excludes any faults arising as a result of improper use of the machine,
of atmospheric agents and of damage due to transport; the guarantee does not cover the
expendable materials and materials required for the periodic maintenance which are at the
customer’s entire expense. The guarantee will, in any case, become automatically null and void
if the compressor is tampered with or if it has been serviced by technicians who are not authorized
to do so by AEROTECNICA COLTRI S.r.l.
Any compressor that is acknowledged to be faulty due to defects in the design, manufacturing or
materials used, will be repaired or replaced free of charge by AEROTECNICA COLTRI S.r.l. at its
factory in San Martino della Battaglia (BRESCIA). The customer will be responsible for the costs of
transport and carriage as well as for any spare parts and expendable materials.
If it should be necessary for service to be carried out under the guarantee at the customer’s premises,
the latter will be responsible for the travel and transfer costs for the staff sent out by
AEROTECNICA COLTRI S.r.l.
Taking delivery of the machine and/or of any faulty components or the transfers for the inspection of
faults and/or defects as notified by the customer, will not, however, denote any implicit acknowledgement
regarding the effectiveness of the guarantee.
Repairs and/or replacements made by AEROTECNICA COLTRI S.r.l. during the guarantee period
will not extend the duration of the same.
Acknowledgment of the guarantee does not itself imply any liability for compensation on the part of
AEROTECNICA COLTRI S.r.l.
AEROTECNICA COLTRI S.r.l. does not assume any responsibility for injury to persons or damage to
property or for any other direct or indirect damage (loss of production or missed profit, etc.) that may
be attributable to faults or defects of the compressor, except for those cases in which a serious fault
can be attributed to the company.
Assistance
1.2
The AEROTECNICA COLTRI S.r.l. technicians are available for any kind of routine or additional
maintenance work.
The request for technical assistance must be sent to AEROTECNICA COLTRI S.r.l. at the following
address:
AEROTECNICA COLTRI S.r.l.
Via Colli Storici, 177
25010 San Martino della Battaglia (BRESCIA)
Fax: 030 9910283
e-mail: coltrisub@coltrisub.it
Guarantee and assistance
9

2
TECHNICAL DESCRIPTION
This chapter provides a technological description of the machine and its main components.
2.1 Operating principle ..........................................................................................................12
2.2 Description of the pump unit .......................................................................................... 13
2.2.1 Monobloc unit .......................................................................................................... 14
2.2.2 Head unit .................................................................................................................. 16
2.2.3 Safety valves ........................................................................................................... 16
2.2.4 Lubrication unit ....................................................................................................... 17
2.2.5 Pressure maintenance valve .................................................................................. 17
2.2.6 Cooling pipes .......................................................................................................... 17
2.2.7 Filters ....................................................................................................................... 18
2.2.8 Frame and sound-proofed casing.......................................................................... 19
2.3 Machine control ................................................................................................................ 19
10
Technical description

The “MCH 6 EXPLORER NITROX” series of compressors can be supplied in versions that run on
electric single or three-phase inputs or petrol fuel:
- MCH 6/EM EXPLORER NITROX (Fig. 1)
Electric single phase;
(see specific manual for electric motor model).
1
- MCH 6/ET EXPLORER NITROX (Fig. 2) Electric
three-phase;
(see specific manual for electric motor model).
2
- MCH 6/SH EXPLORER NITROX (Fig. 3) Petrol
(HONDA engine);
(see specific manual for petrol motor model).
3
Technical description
11

2.1 Operating principle
CAUTION
THE FILLING STATION PRODUCES RESPIRABLE AIR/NITROX.
This system supplies to output percentages nitrox in oxygen of 24% to 40% for volume.
This system supplies a breathable gas stream consisting of an elevated oxygen content relative to
normal atmospheric content of approximately 21% O 2
by volume. This technique employs gas separation
technology utilizing a permeable membrane to separate certain gas molecules from other gas molecules
allowing a controlled flow of output gasses of differing oxygen concentrations.
This system produces DNAx Nitrox in oxygen concentrations of 24% to 40% at maximum pressures of
3200 - 3700 PSI. A supply gas, in this case, “Grade-E” air, will be required. This supply gas is fed at low
pressure (145-185 PSI) to the input port of the membrane. The gas stream is fed through a thermostatcontrolled
heater. As the gas moves through this assembly, its temperature is raised to
35° (110 degrees F). The purpose of this heater is to even out the variations in gas temperature and
produce a more linear performance curve. Once through the heater, the input gas is allowed to pass
through the membrane. As the gas passes through the membrane, the gas volume applies pressure
against the inside walls of the permeable fibers resulting in the migration across the wall of varying
levels of the different constituents of air. Gas volumes of desired O 2
concentrations are achieved in this
manner. In this stage the normal oxygen content of the “Grade-E” air second the norms UNI EN 132,
CGA-E and DIN 3188 (20.9%) is raised to output percentages upwards of 25% to 40%.
A needle valve in the outlet stream of the waste gas (nitrogen) controls the relative O 2
concentrations
while input pressure regulation allows control of the output volume of the membrane. This outlet volume
control is required to balance the input requirements of the high-pressure compressor. As the gas
volume of desired oxygen concentration is produced it is contained and directed to the inlet port of the
high-pressure compressor. An overpressure checkvalve is installed in the inlet fitting of the high-pressure
compressor to protect the compressor from over pressurization of the first stage. Negative pressure
protection is accomplished in the same manner by installing an under-pressure checkvalve in the ambient
air intake side of the membrane output fitting.
As the gas volume is subsequently compressed, it is alternately cooled and raised in pressure again
until it reaches its final design output pressure. Final filtration and purification is accomplished at final
compressor discharge.
Product gas “DNAx” nitrox is available at desired oxygen concentrations (up to 40% O 2
by volume) at
maximum pressures of 3200 - 3700 PSI, for filling Nitrox Storage Bottles or SCUBA cylinders.
Typical Specification for Air :
O 2
Percentage: ................................. 20-22 %
CO 2
: ................................................. 1000 PPM
CO: .................................................. 10 PPM
Hydrocarbons: ................................. 25 PPM
Water: .............................................. 67 PPM
Dew Point: ....................................... - 50° F
Oil & Particles: ................................. 5 mg/m 3
Odor: ............................................... Nothing
12
Technical description

Description of the pump unit 2.2
The pumping unit has the task of producing compressed air at high pressure (200-300 bar) and
purifying it by means of the decantation and filtering systems until it reaches a level of purity equal to
or higher than the limits set by the standards DIN 3188 - UNI EN 132 - CGA/E, or to increase the
pressure of the gas inhaled (only inert - non-explosive gases).
This unit consists of the following components (Fig. 4-5):
Table 1
N° Description N° Description
1 Intake filter 11 Filter
2 1 st stage head 13 Monobloc
3 2 nd stage head 14 Filter-holding bracket
4 3 rd stage head 15 Fan
5 1 st stage head cover 16 Oil cap
6 2 nd stage cylinder 17 Final condensate separator
7 3 rd stage guiding cylinder 18 Condensate separator between stages
8 Separator-holding bracket 19 Condensate discharge connection
9 1 st -2 nd stage cooling pipe 21 Pipe-fastening bracket
10 Final cooling pipe
4 5
Technical description
13

2.2.1 Monobloc unit
The gooseneck, the pistons and the cylinders
also form a part of this unit.
The monobloc (Fig. 6) is made of aluminium
alloy, the two flanges with the ball and roller
bearings that support the gooseneck are oiltight
with the monobloc due to the O-Rings
fitted.
6
The gooseneck and the connecting
rods only turn on roller or ball
bearings (Fig. 7).
The three connecting rods are fitted
on the gooseneck with a single
crank angle.
7
The 1 st and 2 nd stage cylinder are made of cast
iron (Fig. 8) and have traditional multiple
compression rings.
8
14
Technical description

The 3 rd stage is made of special steel with three
sealing rings made of carbo graphite (Fig. 9).
9
The 4 th stage piston (Fig.10) is made with
deaustinised steel, without piston rings coupled
with the corresponding cylinder through a lapping
process.
10
Technical description
15

2.2.2
Head unit (Fig. 11)
The head unit includes the discharge and intake
valves.
The head of the 1 st stage is of a lamellar type and
includes both the intake and the discharge.
The intake and discharge valves are located
directly in their threaded seats of the heads of the
2 nd and 3 rd stages.
The intake valves can be removed using the
special pin wrench (cod. SC000480), having first
removed the heads.
The discharge valves can be removed from the
outside.
See Chapter 11, “Maintenance”.
11
2.2.3
Safety valves
The purpose of the safety valves (Fig. 12) is to
protect the machine (and the cylinders) from
overpressure.
The valve is pre-calibrated in the workshop at the
pressure of 225 bar (3400 PSI) or 300 bar (4500
PSI).
CAUTION
Under no circumstances may these valves be
altered to increase the calibrated pressure.
If these valves should come into operation, check
the cause that has led to the maximum pressure
and take steps according to the instructions given
in paragraph 12.1.
Any tampering with the safety valves causes
serious damage and an immediate cancellation
of the guarantee.
12
16
Technical description

Lubricating unit
2.2.4
Lubrication is carried out by means of a tang
screwed into the end part of the connecting rods
of the 2 nd stage (Fig. 13).
The 3 rd high pressure stage is lubricated by oil
vapours.
13
Pressure maintenance valve
2.2.5
This valve is fitted after the final filter. Just a few seconds after the compressor has been started up,
it keeps the pressure of the entire system at 100 ± 20 bar (see exploded view Chapter 14), for the
purpose of eliminating as much water as possible from the air. It also acts as a non-return valve.
Cooling pipes
2.2.6
The cooling pipes are made of stainless steel
(Fig. 14).
14
Technical description
17

2.2.7 Filters
INTAKE FILTER (Fig. 15)
15
The suction filter is coupled directly to the lid of
the 1 st stage head.
The intake filter consists of a cylindrical aluminium
casing provided with a screw cap that holds the
filtering cartridge.
A special attachment is provided on the filter for
the connection of an extension (optional) which
enables air to be taken from the outside when
the compressor is installed in a place without ideal
ventilation.
For the compressor to operate properly, the filter
maintenance must be carried out as provided for
and at the intervals recommended (instructions
in paragraph 11.6).
ACTIVE CARBON AND MOLECULAR SIEVE FILTER (Fig. 16)
The filter consists of an aluminium tube (B) that
holds the filter cartridge (A).
The shell of the cartridge contains the active
carbon (C) and the molecular sieve (D) placed
between felt disks.
The condition of the cartridge is of fundamental
importance for the quality of the air (see
paragraph 11.7 for replacement instructions).
16
18
Technical description

Frame
2.2.8
The compressor and the engine (electric or
internal combustion) are fitted on a welded steel
frame coated with epoxy resins (Fig. 17).
The frame consists of a coated guard and is fitted
with handles to be able to move the refill station
more easily.
17
The cooling fan and the pulley with corresponding
belt are protected by the corresponding protection
guards made of steel wire mesh.
Machine control
2.3
The refill stations in the “MCH 6” series do not
have an actual control panel as such.
For the models with an electric engine, a cable
is provided for connection to the purchaser’s
mains electricity supply (this cable should
guarantee that the installation complies with the
standards in force concerning such matters in the
country of installation).
18
The electric motors models (MCH 6/ET
EXPLORER NITROX and MCH 6/EM EXPLORER
NITROX) are provided with ON/OFF switch
(Fig. 18 and 19).
19
For the models with an internal combustion
engine, the operating controls are all on-board
the engine and enable the refill station to be started
up and also to regulate the speed according to
requirements (Fig. 20). 20
Technical description
19

3
TECHNICAL CHARACTERISTICS
This chapter provides some technical information concerning the machine.
3.1 Technical characteristics of the pump unit .................................................................... 20
3.2 Technical characteristics “MCH6” ................................................................................... 21
3.2.1 Sizes and weights .................................................................................................... 22
3.2 Noise .................................................................................................................................. 23
3.1 Technical characteristics of the pump unit
The pump unit consists of:
- four compression stages;
- four cylinders;
- forced air cooling by means of a large diameter fan;
- splash lubrication with immersed tangs;
- stainless steel cooling pipes.
20 Technical characteristics

Caratteristiche tecniche “MCH6”
3.2
Table 1
High pressure compressor:
Maximum Block Output Pressure
300 bar - 4700 psi
Final System Discharge Pressure
225 bar - 3200 psi
Number of Stages 3
Number of Cylinders 3
Capacity
ca230Lt/min.14m3/h5-8.0SCFM
Lubricant
Synthetic Nitrox
Condensate Drains
Max. non-continuous peak pressure for NITROX
Max. non-continuous peak pressure for AIR
Cylinder diameter
Speed of rotation
Piston stroke
Intermediate pressures
Power motor
Tension and frequency (three-phase)
Membrane Operating Temperature Range
Input Operating Pressure Range
Input Gas Composition
Output Gas Composition
Output Gas Volume (Stabilized):
Membrane Operating Temperature Range
2 manual
1 automatic
225 o 330 bar - 3200 o 4700 psi
95/38/14 mm
1350 r.p.m.
40 mm
1 st stage: 5 bar/70 psig
2 nd stage: 40 bar/570 psig
3 rd stage: 225-330 bar/3200-4800 psig
2x 5,5Kw-7,5HP
400V - 50Hz
440V - 60Hz
230V - 50Hz
230V - 60Hz
38-46 °C - 100-115 Fahrenheit
Air UNI EN 132 -
DIN 3188 - CGA/E
14 - 28 m3/h
Nitrox: 26% - 40% - air
@ 32% - 40% (5-10 SCFM ) - 9-18 m3/h
max 200psi - 14 bar
DA VERIFICARE ATTENDERE
ITALIANO
Technical characteristics
21

3.2.1 Sizes and weights (Fig. 21÷23)
MCH 6/ET EXPLORER NITROX
21
MCH 6/EM EXPLORER NITROX
22
MCH 6/SH EXPLORER NITROX
23
Table 2
MODEL A (mm) B (mm) C (mm) Weight (Kg)
MCH 6/ET EXPLORER NITROX 1295 406 558 63,5
MCH 6/EM EXPLORER NITROX 1295 406 558 63,5
MCH 6/SH EXPLORER NITROX 1295 406 558 63,5
22
Technical characteristics

Noise
3.2
The “MCH 6”series of compressors have been designed and built with the objective of reducing
acoutsic pressure to a minimum.
The reading of the machine noise level was taken
from the “operator’s work place” (Fig. 24), the
instrument (phonometer) has been positioned at
a height of a 1,6 m from the floor and at one m
distance from the compressor casing, thus
obtaining the results detailed in table 3.
24
Table 3
METHODS OF MEASUREMENT
ISO 3746
MCH 6/EM
EXPLORER NITROX
MCH 6/ET
EXPLORER NITROX
MCH 6/SH
EXPLORER NITROX
Level of acoustic pressure at the operator’s work place dB(A) 83,0 dB(A) 83,0 dB(A) 83,0
Level of acoustic power dB(A) dB(A) dB(A) 100,7
Peak level - - -
INSTRUMENTS
Bruel & Kjacr sound level integrating meter
Microphone for sound level meter
Gauge
Mod.2231 cl.1
Mod.4155 cl.1
Mod.4230 cl.2
Whenever the machines are used for work in environments where the daily noise level to which the
operators are exposed is higher than 80 dBA, the employer must take steps to apply all the
measurements necessary to safeguard the operator’s health. In particular, the operators must, if
necessary, use all the individual protection devices to protect themselves from the noise level.
DA VERIFICARE
ATTENDERE ITALIANO
Technical characteristics
23

4
PRECAUTIONS FOR USE AND
MAINTENANCE
Refer to the specific “Safety Regulation Manual” which is supplied enclosed with this manual (and
which forms an integral part of the same).
4.1 Machine area diagrams ..................................................................................................... 25
4.1.1 Safety devices ............................................................................................................ 26
4.1.2 Residual risk areas .................................................................................................... 28
CAUTION
THE COMPONENTS YOU WILL BE USING CONTAIN ELEMENTS THAT MAY EXPOSE YOU TO
BOTH LOW AND HIGH-PRESSURE GAS STREAMS. GAS, EVEN UNDER MODERATE
PRESSURE, WILL CAUSE EXTREME BODILY HARM IF NOT TREATED WITH CARE.
DO NOT ALLOW ANY GAS STREAM TO BE DIRECTED AT ANY PART OF THEBODY. ANY
HIGH-PRESSURE HOSE END OR FITTING WILL CAUSE EXTREME HARM IF IT COMES LOOSE
FROM ITS RESTRAINT (OR TERMINATION) AND STRIKES ANY BODY PART. USE
APPROPRIATE CARE IN MAKING ALL CONNECTIONS.
Cautionary Operational Note:
this system contains automatic condensate drains. Use Auto Purge
feature to test for proper operation. However, when compressor is
in operation, open manual condensate drain bleeder valves at least
once a day to ensure that the auto drain is working properly.
Cautionary Operational Note:
DO NOT USE ANY FORM OF MINERAL OIL IN ANY
COMPRESSOR IN THIS SYSTEM. Use only EZ 1000
Compressor Lubricant.
Cautionary Operational Note: DO NOT USE THIS SYSTEM TO PRODUCE ABOVE 40% O 2
CONCENTRATION.
Cautionary Operational Note:
THE NITROGEN EXITING FROM THE NEEDLE VALVE MUST
BE VENTED OUTSIDE. SUFFOCATION AND DEATH CAN
OCCUR IF NITROGEN IS ALLOWED TO COLLECT IN AN
ENCLOSED SPACE.
Cautionary Operational Note:
when pumping nitrox, do not pump above 232 bar (3700psi).
Cautionary Operational Note: temperature inside the cabinet should never exceed 46 °C
(115 ° F). Do not operate at that temperature.
24
Precautions for use and maintenance

Machine area diagrams
4.1
The “MCH 6” series of compressors are machines that operate automatically and are run either
electrically or by internal combustion.
Therefore the term “operator” as repeatedly defined in this manual refers to the following professional
figures:
- PERSON IN CHARGE OF MAINTENANCE, this is the person entrusted with the handling,
installation, start-up, regulation, cleaning, repair, changing of the tooling and maintenance of the
machine.
This person must be a qualified member of staff who has followed courses of specialization and
who has had experience with the handling, installation, start-up and maintenance of machines and
plants of a mechanical, electrical and pneumatic type.
It is always advisable for the person in charge of maintenance to follow a training and specialization
course on the machine given by the AEROTECNICA COLTRI S.r.l. technicians.
- PERSON IN CHARGE OF OPERATION, this is the person responsible for operating the
machine whose work must be limited only to filling the cylinders and the control operations.
This person must be perfectly acquainted with all the machine instructions and operating methods
as described in this manual and the regulation manual.
It is absolutely prohibited for the person in charge
of operation to carry out any tasks other than those
described above or to work in areas other than
those marked in figure 25.
25
Precautions for use and maintenance
25

4.1.1 Safety devices
The “MCH 6 EXPLORER NITROX”series of compressors for the various models (Fig. 27), are provided
with a series of guards that are screwed into place and protection devices to ensure the safety of the
operator that limit the operating field and guarantee a good machine performance.
The figure shows the safety devices provided on the compressors and the information labels applied.
MCH 6/EM EXPLORER NITROX
MCH 6/ET EXPLORER NITROX
MCH 6/SH EXPLORER NITROX
27
26
Precautions for use and maintenance

Table 1
POSITION SAFETY DEVICE DESCRIPTION INSPECTION
Safety valves. Protect the third stage and the The safety valve must be checked at
cylinders from being overfilled; it is each f illing operation; start up the
calibrated during the inspection of the compressor w ith the cylinder valves
1
compressors.
closed and the filling cock open.
Check that the safety valve starts
operating correctly w ith the pressure
gauge, open the valves and proceed
w ith the filling.
2 Sound-proofed frame. Built of steel. Periodically check its integrity.
3
4
Symbol of caution and w arning w ith a picture show ing that the instruction manual must be read (only for internal
combustion engines).
Manual condensate discharge taps. The condensate is a milky-w hite Open the discharge taps every 10-15
emulsion formed of oil and w ater. minutes and make sure the
The absorption of w ater by the filter condensate comes out visibly and
causes w ear on the filter itself and consistently.
consequent contamination.
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
(see "Safety regulations"
enclosed)
(see chapter 11)
Activated carbon filter and molecular
sieve.
The quality of the air depends to a The cartridge must be replaced
great extent on the conditions of the before the air becomes foul smelling.
filter and sieve.
For the frequency of replacement,
see the instructions in Chapter 11,
"Maintenance"".
Symbol indicating the direction for the opening/closing of the air or the fuel (only for internal combustion engines).
Symbol indicating the direction of the accelerator lever to increase/reduce the speed (only for internal combustion
engines).
Pressure gauge show ing the operating pressure.
Symbol of fire danger at high temperatures.
Maximum operating pressure.
Symbol w arning of the risk of crushing hands.
Danger of moving parts symbol.
Danger of voltage present symbol.
Removal of safety devices prohibited symbol.
Work on moving parts prohibited symbol.
Smoking prohibited symbol.
Gloves compulsory picture diagram.
Goggles compulsory picture diagram.
Helmet compulsory picture diagram.
Rating plate on the electric motor giving data concerning voltage, phases, frequency, breaking capacity.
Warningsignpresenceofoxygen-DANGEROFEXPLOSION
Machine plate show ing the CE mark.
Hose area : danger of direct contact by the operator if breakage should occur during cylinder filling.
Rating plate detailing the acoustic pressure (only for internal combustion engines).
Rating plate detailing the sound pow er level (only for internal combustion engines).
Warning to use the machine and carry out maintenance in accordance w ith the instruction manual.
Warning to cut off the pow er supply before carrying out any maintenance w ork.
Precautions for use and maintenance
27

4.1.2 Residual risk areas
In some areas of the machine there are some residual risks that could not be eliminated during the
design phase or protected by guards due to the particular operation of “MCH 6 EXPLORER NITROX”
(Fig. 28÷30) series of compressors. Each operator must be aware of the residual risks present on the
machine in order to avoid possible accidents.
28 29
MCH 6/EM-ET EXPLORER NITROX
30
MCH 6/SH EXPLORER NITROX
Table 2
POSITION
DESCRIPTION
Danger of polluting the air produced ow ing to the possibility of mixing fumes or vapours from
1
the lubricating oil w ith the compressed air produced.
Electrical danger. Use the machine w ith suitable protection from the electrical pow er supply
2
especially in the presence of w ater and humidity.
Danger deriving from the noise emitted by the compressor if maintenance w ork is carried out
3
w ithout the safety guards.
Pump unit area : danger from heat. For any maintenance operation (requiring the removal of
4
the safety guard) w ait about 30 minutes after turning off the engine.
Transmission belt area: danger of crushing or dragging by the belts w hen maintenance w ork
5
is carried out w ithout the safety guards.
Cooling fan area: danger of impact and abrasion if the cylinders are refilled w ithout the safety
6
guards.
Engine area: dangers from heat; w hen the engine has stopped w ait for it to cool dow n before
7
touching the parts w ith the hands.
8 Tank area: danger of explosion, fire.
Danger of direct contact by the operator in case of break up of the refill hose during bottles
9
refilling.
28
Precautions for use and maintenance

UNPACKING AND HANDLING THE MACHINE 5
This chapter provides the instructions necessary for unpacking and handling the machine.
5.1 Unpacking the machine .................................................................................................... 29
5.2 Pack contents .................................................................................................................... 29
5.3 Handling the machine ....................................................................................................... 30
Unpacking the machine
5.1
The machines in the “MCH 6 EXPLORER NITROX” series are delivered fully assembled, but with
the hoses supplied separately.
The compressors are packed in cardboard boxes fitted on europallets to make handling and
transportation easier.
To unpack the boxes containing the machine,
follow the instructions given on the outside of
the boxes with great care (Fig. 31).
31
Pack contents
5.2
The standard equipment with which the machine is supplied is:
- 2 refill hoses measuring 1200 mm with valve;
- operating and maintenance booklet;
- enclosure with the Instruction Manual (Safety regulations);
- lubricating oil in cans (2 lt);
- engine operating and maintenance booklet (only for the internal combustion models).
Unpacking and handling the machine
29

5.3 Handling the machine
Having removed the compressor from its pack as described in the previous paragraph, the machine
can be moved to its place of installation.
To carry out this operation, it is necessary to use
a fork-lift truck or transpallet (of a suitable
capacity), the forks of which must be positioned
between the feet of the europallet on which the
machine is placed (Fig. 32).
32
When the compressors in the “MCH 6
EXPLORER NITROX” series are not fitted on
europallets, they can easily be moved even by
hand thanks to the handles provided for this
purpose on the frame (Fig. 33).
CAUTION
In this second case, the lifting operation must be
carried out by at least 2 people at the same time.
33
30
Unpacking and handling the machine

INSTALLATION
6
This chapter provides a description of the operations for installing the machine.
The following instructions presume that the operator has already become familiar with the regulations
given in Chapter 4, “Precautions for use and maintenance”.
6.1 Positioning ......................................................................................................................... 31
6.2 Connections ....................................................................................................................... 32
6.2.1 Connecting the air intake extension......................................................................... 32
6.2.2 Connecting the refill hoses ....................................................................................... 35
6.2.3 Electrical connection for models MCH 6/EM and MCH 6/ET .................................. 35
CAUTION
Before proceeding with the installation operations described below, read Chapter 4, “Precautions for
use and maintenance” carefully and proceed as directed.
Positioning
6.1
1 Position the machine in the chosen area and check that it is on a level (the plane should not be at an
angle of more than 5° to assure perfect lubrication). For the machine sizes, see paragraph 3.1.2
“Sizes and weights”.
WARNING
The compressors used on board boats can be certified with inspections by R.I.Na (Italian Register of
Shipping), to be requested as a special supply.
2 Check that in the place chosen for installation there are suitable ventilation conditions:
- a good change of air (several windows), no dust and no risks of explosion, corrosion or fire.
3 Use in environments with a temperature of over 40 °C makes it necessary to use synthetic lubricating
oil and air-conditioning must be provided for the environment.
CAUTION
The “MCH 6 EXPLORER NITROX” series of compressors with internal combustion engine, must be
installed in the open air.
Installation
31

4 Position the machine at a minimum distance
of 1 m. from the surrounding walls and at a
distance of not less than 1.5 m. from the
ceiling in order not to compromise the proper
operation and cooling of the pump unit
(Fig. 34).
34
5 The models with the internal combustion engine
must be placed outside at a minimum distance
of 1 m from buildings and machines (Fig. 35).
35
6 Make sure that the machine is in a well-lit area, so that each detail can be clearly made out (especially
the writing on the plates).
Add artificial lighting to the area if the natural lighting is not suffieint for the requirements mentioned.
6.2 Connections
6.2.1 Connecting the extension for the air intake
For models run on electricity, if the machine should be placed in a location without the ventilation
characteristics described in the previous paragraph, an extension must be installed to have an
intake of air from outside or from a place with the ventilation characteristics described.
32
Installation

CAUTION
Only use a flexible pipe provided with a steel spiral internal reinforcement to prevent bending and a
consequent reduction in the cross section.
1 Unscrew the filter fitting with a proper wrench
(Fig.36).
36
2 Completely unscrew the filter from the head
(Fig.37).
37
3 Screw the male fitting (1/2") to the head and
connect the hose (internal Ø 20 mm) (Fig.38).
38
Installation
33

4 Fit the additional intake filter on the end of the
extension pipe (Fig. 39).
39
5 Position the end of the extension on which the intake filter is fitted (air intake) in a ventilated place
protected from atmospheric agents.
6 Direct the air intake in a position “against the
wind” (Fig. 40).
40
7 Make sure that there are no bends or breakages
along the length of the pipe (Fig. 41).
If the extension should have broken during the
connection to the head, it must be replaced.
CAUTION
Make sure that the air intake is away from exhaust
fumes given off by internal-combustion engines
or harmful fumes.
41
34
Installation

Connecting the refill hoses
6.2.2
1 Screw hose into the special attachment “A”
(Fig. 42) without securing it too tightly (see
point 3).
42
2 A torque wrench should be available to fasten the hose.
3 Tighten the hose to the machine with a torque
wrench setting of 15Nm (Fig. 43).
43
NOTE:
- the hoses should be replaced every so often
(every year or every 1000 hours) or when they
show signs of being scratched. For this purpose,
check the number of operating hours of the hoses
that are to be disconnected (on the hour counter).
- The minimum radius of curvature of each hose
must not be less than 250 mm.
Electrical connection for models MCH 6/EM and MCH 6/ET
6.2.3
The compressor is supplied with an electric cable
and 16A plug (Fig. 44).
44
Installation
35

CAUTION
Before fitting the plug into the mains supply, check that the installation has been set up in accordance
with the regulations in force in the country where the compressor has been installed.
1 Also check that the details on the machine rating plate are compatible with the mains power supply,
especially the nominal current and input voltage.
2 The mains power supply should be provided with an effective grounding system. It is particularly
important to check that the earth resistance value complies with the protection and operating
requirements of the electrical installation of the compressor.
CAUTION
An effective machine earthing system is of fundamental importance for safety purposes.
36
Installation

CONTROL PANEL
7
This chapter provides a description of the functions carried out by the various devices fitted on the
control panel.
7.1 Control panel ..................................................................................................................... 37
7.1.1 Wall-mounted control panel for models with electric power supply (optional) ..... 38
7.1.2 Controls on board the internal combustion engines ............................................ 39
7.2 Indication and control devices ........................................................................................ 40
Control panel
7.1
The “MCH 6 EXPLORER NITROX” series of refill
stations are not provided with an actual control
panel as such.
A control board housing the machine pushbuttons
and control instruments is available on request
(optional) for the models with electric power
supply (Fig. 45) that can also be made by the
purchaser, following the laws in force concerning
such matters.
45
CAUTION
This type of control panel has not been designed
to be fitted on board the machine.
The models with electric engine (MCH 6 /EM
EXPLORER NITROX and MCH 6/ET EXPLORER
NITROX) are provided with an “ON/OFF” start
switch fitted directly on the engine (Fig. 46-47).
46
For models with an internal combustion engine,
the start controls are only those provided on board
the engine supplied.
Control panel
47
37

7.1.1
Wall-mounted control panel for models with electric power supply
(optional)
As previously mentioned, a control board can be supplied that houses 3 operation pushbuttons and
the counter that memorizes the number of operating hours (Fig. 48).
1ON – green button.
It enables the compressor to be started up.
The button has a light inside that comes on when
it is pressed.
(The general switch must be in the “ON”
position).
2 OFF – red button.
It enables the compressor to be stopped.
The button has a light inside that comes on when
the power supply is connected.
48
3 MANUAL PURGE – yellow button.
To drain the condensate manually.
This function permits the pressure present inside the condensate separators and the filter to be
discharged, draining off the condensate through the electromagnetically - controlled valves.
This operation is normally carried out by the timer at regular intervals.
4 HOUR COUNTER
It enables the actual operating hours to be memorized in order to be able to carry out the maintenance
work as provided for.
5 PRESSURE SWITCH
It indicates the maximum cylinder filling pressure and can be adjusted manually. If the set pressure is
reached, the compressor is switched off.
38
Control panel

Controls on board the internal combustion engines 7.1.2
Each refill station run by petrol or diesel fuel is
provided with an operating and maintenance
manual for the engine fitted (Fig. 49) which is
compiled by the engine manufacturer.
49
These enclosures give all the information concerning the engine and its operation.
Below is a brief description of the main controls on board the engine.
PETROL ENGINES (Fig. 50)
1 Accelerator control lever.
2 Engine “ON/OFF” switch.
3 Start handle.
4 Fuel lever.
5 Air lever.
50
Control panel
39

7.2 Indication and control devices
The “MCH 6 EXPLORER NITROX” series of refill stations are fitted with some devices to control the
discharge of condensation, the cleaner filter and the lubrication oil level (Fig.51).
1 Pressure gauge
It indicates the working pressure.
DA VERIFICARE
51
2 Strainer filter
The purpose of this device is to withhold the
impurities present in the air before they enter
the cylinders.
3 Condensate discharge taps
They enable the condensate that has
accumulated during machine operation to be
discharged by hand.
The condensate is discharged automatically
by the machine by means of electromagnetically-controlled
valves.
40
Control panel

START AND STOP
8
This chapter describes the operations regarding the machine start up phase.
The following instructions presume that the operator has already become familiar with the precautions
given in Chapter 4 “Precautions for use and maintenance” and that the machine has been installed
according to the instructions given in the previous chapter.
8.1 Filling the machine ............................................................................................................ 41
8.2 Checks ................................................................................................................................ 43
8.2.1 Models with electric power supply ........................................................................... 43
8.2.2 Models with petrol supply ........................................................................................ 45
8.2.3 Calibrate analyzer ..................................................................................................... 49
8.2.4 Stop ........................................................................................................................... 50
Filling the machine
8.1
WARNING
Before proceeding with the start up operations described below, read chapter 4, “Precautions for use
and maintenance” very carefully and follow the advice given.
Fill the lubricating oil sump of the pump unit when the machine is switched off.
The machine is delivered without lubricating oil
which is collected in the cans that can be found
inside the machine packaging (Fig.52).
52
Start and stop
41

The oil will have to be filled after removing the cap
(Fig.53).
The quantity of oil to be poured in is 1.5 lt. and the
level should be checked with the machine turned
off, bearing in mind that an excess amount of oil
may cause infiltrations in the cylinders and a
deposit on the valves. On the contrary, if the oil
level is too low, the tang of the connecting rod is
prevented from providing the correct lubrication
with the possibility of causing a seizure of the
cylinders.
To check the amount of oil added, see the next
paragraph.
When the operation has been completed, screw
the cap up again.
53
MODELS WITH INTERNAL CONBUSTION ENGINES
For models run by internal combustion engines, the level of the engine oil must be checked.
CAUTION
If the engine is run with an insufficient level of oil, it may be irreparably damaged. Check the oil level on
a flat surface with the engine off.
Remove the oil cap and clean the dipstick
(Fig. 54).
Insert the dipstick in the oil refill hole without
screwing it down.
54
Remove the dipstick and check the level (Fig. 55).
55
42
Start and stop

If the oil level is low, top it up until the maximum level is shown on the dipstick. Do not exceed this level.
Use oil of the recommended type.
CAUTION
The life of the engine may be reduced if non-detergent oil or oil for a two-stroke engine is used.
Checks
Models with electric power supply
8.2
8.2.1
1 Turn on the manual condensate discharge taps
(Fig. 56).
56
2 Open the discharge cock to avoid a start under
effort (Fig. 57).
57
Start and stop
43

58
3 Accendere la macchina portando l’interruttore generale
in posizione “ON” (Fig. 58-59). Nel caso
si disponga di quadro di comando (opzionale)
verificare l’avvenuta accensione tramite la lampada
rossa del pulsante “OFF”.
4 Far girare il compressore per 10 minuti circa,
successivamente lasciarlo fermo per 20 minuti.
59
5 Check the level of the pump unit lubricating oil.
The level has to be within the two reference marks
on the dipstick (Fig. 60).
If the level is too low, top the oil up following the
instructions given in the previous paragraph.
If the level is too high, discharge some of the oil
as described in chapter 11.4 “Changing the
lubricating oil”.
To dispose of the oil, refer to chapter 10.2, “Disposal
of waste”.
60
6 The operation to check the level of the lubricant must be carried out when the machine arrives and then
before starting up the compressor. It must be remembered that if the level is too low or too high it may
compromise the running of the compressor.
7 In order to check the correct connection of the electrical phases, the engine should be turned on and
the direction of rotation checked.
44
Start and stop

If the direction of rotation does not correspond with
that shown by the arrow located on the panel (or
on the engine Fig. 61), the electricity supply must
be cut off and two of the 3 phases must be inverted
on the main input or on the motor’s terminal board.
61
CAUTION
The yellow/green wire corresponds to the earthing.
DO NOT disconnect or invert this wire. (Fig. 62).
62
Models with petrol supply
8.2.2
AIR FILTER
CAUTION
Never run the engine without the air filter. The
engine would certainly be damaged.
Clean the filtering elements (Fig. 63) of the air filter
until they are quite clean and check that they are
in good operating condition (see the instructions
in chapter 11 entitled “Maintenance” in this
manual).
63
Start and stop
45

Having carried out the previously mentioned
checks on the engine, open the cylinder refill cock
(Fig. 64).
64
Open the discharge cock to avoid a start under
effort (Fig. 65).
65
Start the compressor up following the instructions given below.
Add fuel to the tank (unleaded petrol) (Fig. 66).
66
CAUTION
- The fuels are highly inflammable and may explode.
- Supply the engine with fuel in a well-ventilated place when still. Do not smoke and do not allow naked
flames or sparks to get near the engine during refilling or in the area where the petrol is kept.
- Do not fill the fuel tank right up. There must not be any fuel in the filling neck. After filling, check that
the tank has been closed properly.
- Take care not to spill any fuel during filling, otherwise it could catch fire. If petrol is spilt, wipe it all up
before turning the engine on.
- Avoid repeated or prolonged contact of petrol with the skin and do not breathe in the vapours.
KEEP OUT OF CHILDREN’S REACH.
46
Start and stop

Move the fuel lever to the “OPEN” position (anticlockwise
direction) (Fig. 67).
67
Move the air lever to the “CLOSE” position
(clockwise direction) (Fig. 68).
68
Turn the accelerator lever slightly in an anticlockwise
direction (Fig. 69).
69
Start and stop
47

Turn the engine starter switch to the “ON” position
(Fig. 70).
70
Pull the starter cord until a certain resistance is
felt, then pull hard (Fig. 71).
CAUTION
Do not allow the cord handle to violently go back
and hit the motor. Reposition it in order to avoid
damages at the start.
71
Move the accelerator control lever into position to
obtain the required number of revs (Fig. 72).
72
Run the compressor for about 10 minutes then leave it at a standstill for 20 minutes.
48
Start and stop

Check the level of the pump unit lubricating oil.
The level has to be within the two reference marks
on the dipstick (Fig. 73).
If the level is too low, top the oil up following the
instructions given in the previous paragraph.
If the level is too high, discharge some of the oil
as described in chapter 11.4 “Changing the
lubricating oil”.
To dispose of the oil, refer to chapter 10.2,
“Disposal of waste”.
73
The operation to check the level of the lubricant must be carried out when the machine arrives and
then before starting up the compressor. It must be remembered that if the level is too low or too high it
may compromise the running of the compressor.
Calibrate analyzer
8.2.3
Calibrate the analyzer to 20.9 as follow:
please read analyzer manual for more specific instructions, especially if analyzer will be located in a
hot and/or high humidity area.
- Remove the fitting covering the sensor “a”
(Fig. 74);
- remove the fitting covering the sensor “b”
(Fig. 74).
74
- Expose the sensor to ambient air for approximately (15) seconds.
Start and stop
49

- Adjust the meter until the reading “c” stabilizes
to 20.9% (Fig. 75).
- Re-connect the sensor fitting to the analyzer.
CAUTION
75
Never connect an O 2
analyzer directly to a high
pressure air/nitrox source.
8.2.4 Stop
EMERGENCY STOP
The machine is equipped with an emergency system that provides to automatically lock it in the
following cases:
- there is a temporary power supply cut;
- the electric motor thermal breaker trips due to overcharge.
Furthermore, in case bottles are too much filled, the free discharge safety valve trips, while the compressor
remains operating.
CAUTION
Furthermore, after an emergency stop, before starting it again, make sure that the cause of the emergency
has been removed.
STOP AT SHIFT END
To stop the compressores with electricity supply (MCH 6/EM e MCH 6/ET) just push the stop pushbutton
on the machine control panel and then set the main switch to “OFF” (or zero) (Fig.76-77);
76 77
50
Start and stop

78
then release the condensate using the proper valves
(Fig.78-79).
79
Disconnect the plug from the line socket.
For compressor supplied with fuel (MCH 6/SH) you have to:
- turn the accelerator lever in an anti-clockwise
direction as far as it will go (Fig. 78);
80
Start and stop
51

- move the engine switch to “OFF” (Fig. 81);
81
- move the fuel lever to “CLOSE” or “S” according
to the model (in a clockwise direction) (Fig. 82);
82
- discharge the condensate using the proper cock
(Fig.83).
83
CAUTION
If the machine stopover is long (example over 5 days) it is suitable to empty the fuel tank.
Keep to the instructions detailed in “chapter 10” of this manual.
52
Start and stop

USE 9
This chapter describes the operations required for refilling the cylinders.
The following instructions presume that the operator has already become familiar with the precautions
given in Chapter 4 “Precautions for use and maintenance” and that the machine has been started up
according to the instructions given in the previous chapter.
9.1 Preliminary operations ....................................................................................................... 53
9.2 Refilling the cylinders ........................................................................................................ 55
WARNING
Before proceeding to use the machine as described below, read chapter 4, “Precautions for use and
maintenance” very carefully and follow the advice given.
Preliminary operations
9.1
1 Check that the safety valve is operating properly by starting up the compressor with the end taps
turned off so that the pressure in the circuit rises quickly and the valve comes into operation at the set
pressure.
The valve is pre-calibrated in the factory at a pressure of 225 bar or 330 bar.
WARNING
Under no circumstances may the calibration pressure of these valves be increased. Any tampering
with the safety valves may cause serious damage to the machine or to persons and a cancellation of
the guarantee.
2 Check the condition of the cylinders to be filled.
Also refer to the instructions supplied with the cylinders, compiled by the cylinder manufacturers.
DANGER
If the cylinders should show evident signs of internal and/or external corrosion, it is not advisable to
proceed with the filling operation, even if they comply with inspection requirements.
CAUTION
Only use inspected cylinders provided with the relative approval. The cylinder operating and filling pressure
values are given on the cylinders themselves. It is prohibited to exceed this refill pressure value.
Use
53

After refilling, the cylinders must not be emptied
completely, even during winter storage, to prevent
damp air from getting in (Fig. 84).
84
3 Check the condition of the hoses and the relative connectors.
CAUTION
Refill hoses have to be periodically replaced (every year, or every 1000 hours) or when they are scratched.
Check the refill hose operating hours you want to disconnect (on the hours counter). The minimum
radius of curvature of the refill hose shall not be lower than 250 mm.
CONDENSATE DISCHARGE
Place a container under the two condensate sniffle
valves and then proceed with the manual discharge
by turning on the repsective taps (Fig. 85-86).
This operation should also be carried out during
the cylinder refill operations, every 15/20 minutes
only on the models without an automatic condensate
discharge feature.
85
86
54 Use

Refilling the cylinders
9.2
During this operation, the operator’s position is that shown in chapter 3.2 “Noise”.
CAUTION
During the refilling of the cylinders it is compulsory for staff who are not involved with the task to keep a
distance of at least three metres. Furthermore, it is not permitted to disconnect the hoses from the
connectors or from the refill tap while the machine is under pressure.
WARNING
During the cylinder refill phase, it is advisable to immerse the cylinders in cold water in order to reduce
the drop in pressure when the cylinders cool down.
The attachments are disponible: INT - DIN 200 and
DIN 300 (Fig. 87).
87
1 Fit hose attachment “1” to the cylinder valves
and turn on tap “2” (Fig. 88).
88
2 Turn on the cylinder tap (Fig. 89).
89
Use
55

3 Start up the compressor (see the instructions in chapter 8 “Start-up and stopping”) checking that the
discharge cock of the separator is open.
Wait a minute before closing this cock in order to allow the heating and the exit of the residual
condensate.
4 After having closed the condensate discharge, make the pressure rise until the final safety valve is
operated, checking its operation. Refill the bottle until the bottle maximum operating pressure is
reached.
5 Turn off the cylinder tap and that of the hoses
(Fig. 90).
90
6 Press the pressure bleed button on the refill tap
(Fig. 91).
91
7 Check the pressure shown om the manometer
is zero (Fig. 92).
92
56 Uso

The nitrox percentage can now be read at 0 2
analyzer on the compressor panel.
The analyzer labeled “Membrane Output” analyzes
the permeate gas at the membrane output port
(Fig. 93).
93
Disconnect the cylinder attachment.
DANGER
If an emergency should arise during the refilling of the cylinder, stop the compressor by pressing the
“OFF” button or use the general knife switch.
The machine is, in any case, provided with an emergency system that automatically blocks it when:
1) the pressure set is reached;
2) there is a temporary cut in the power supply (models with electric power supply);
3) the heat release of the electric motor trips due to an overload (models with electric power supply).
After an emergency stop and before proceeding with a subsequent operation, it is necessary to check
that the cause of the emergency has been eliminated.
Uso
57

10
PUTTING THE MACHINE OUT OF OPERATION
AND DISMANTLING THE MACHINE
This chapter provides instructions to be followed for long machine standstills or for the dismantling of
the same.
10.1 Instructions for prolonged machine standstills ................................................................ 58
10.2 Disposal of waste products ................................................................................................ 61
10.3 Dismantling the machine ................................................................................................... 61
CAUTION
Before carrying out any procedure on the machine, read Chapter 4, “Precautions for use and maintenance”
with care.
10.1 Instructions for prolonged machine standstills
If the compressor is not to be used for prolonged periods, remove the active carbon cartridge from the
strainer filter.
Run the compressor idle for a few minutes to drain off any residue condensate. Stop the compressor,
remove the intake filter, start up the compressor again spraying a few drops of oil into the intake hole so
that a light film of lubricant is sucked in and penetrates the internal parts of the compressor.
Stop the compressor and refit the intake air filter. Clean the external parts and try to remove any saline
humidity and oily deposits. Protect the compressor from dust and water by storing it in a clean, dry
place.
CAUTION
DEPRESSURIZE THE UNIT.
Turn the machine off using the general switch (position “0”) and remove the power plug. Carry out a
general cleaning operation on the machine and all its components.
MODELS WITH INTERNAL COMBUSTION ENGINES
The “MCH 6/SH EXPLORER NITROX” series of compressors run (by petrol engines), require additional
precautions due mainly to the presence of the fuel, especially if the compressor has to be moved from
its place of use.
In these cases, apart from the operations to be carried out on the pump unit, it is also necessary to take
the following steps.
CAUTION
When the compressor is transported, close the fuel cock on the engine and keep the refill station in a
vertical position at all times to avoid spilling any fuel. Risk of fire or explosion.
58 Putting the machine out of operation
and dismantling the machine

The place where the refill station is to be stored must be a dry, clean and covered location.
CAUTION
The fuels are highly inflammable and may explode. Keep flames and objects producing sparks at a
distance. Do not smoke in the surrounding area.
PETROL ENGINES
a) With the fuel cock closed, remove and empty
the sump of all sediment (Fig. 94).
94
b) Open the fuel cock and discharge the fuel from
the tank into a suitable container (Fig. 95).
95
c) Replace the sediment sump and secure it
tightly. Discharge the fuel by unscrewing the
discharge screw (Fig. 96). Discharge the fuel
from the carburettor into a suitable container.
96
Putting the machine out of operation
and dismantling the machine
59

d) Change the engine oil following the instructions given in chapter 11 “Maintenance”.
Remove the spark plug (Fig. 97) and pour a spoon
of clean motor oil into the cylinder.
97
Allow the engine to turn a few times to distribute
the oil and then replace the spark plug.
Blow the pull start cord (Fig. 98) until resistance is
felt.
98
Continue to pull until the notch in the pulley lines
up with the hole in the pull start (see the illustration
in figure 99). At this point, the suction and discharge
valves are closed and this helps to protect the
engine from internal corrosion.
99
60
Putting the machine out of operation
and dismantling the machine

Disposal of waste products
10.2
When using the compressor, special waste products are produced. It must be remembered that waste
from industrial processes, agricultural, artisan and commercial activities and service industries cannot
be disposed of together with normal urban waste either because of their quality or quantity.
Old or obsolete machinery is also to be considered as special waste.
Special care must be taken with the disposal of worn active carbon filters which, being a waste product
that cannot be disposed of together with normal urban waste, must be dealt with in compliance with the
laws in force in the country where the compressor is installed.
It is important to remember that the loading and discharge of waste oil, special waste products and toxic
or harmful waste products deriving from industrial or artisan processes must be registered. The collection
of waste oils and special toxic or harmful waste products must be carried out by specially authorized
companies. The disposal of waste oils in particular must be carried out in accordance with the regulations
in force in the user’s country.
Dismantling the machine
10.3
The operations required for stripping and demolishing the machine must be carried out by
qualified staff.
To dismantle the machine, follow the regulations imposed by the laws in force in the user’s country.
Before demolishing the machine, an inspection must be requested by the competent authority with the
issuing of a relative report.
CAUTION
DEPRESSURIZE THE UNIT.
Stop the motor and disconnect the machine from the power supply.
Remove any interfacing that there may be between the compressor and other machines, checking
carefully that any interfacing between other machines that are still in use remain operative.
Empty the tanks containing the lubricating oil or fuel (models with internal combustion engines).
The oil or fuel must be stored in accordance with the provisions of the law.
For models run by petrol engines (MCH 6/SH
EXPLORER NITROX):
- open the fuel cock and discharge the fuel from
the tank into a suitable container (Fig. 100).
100
Putting the machine out of operation
and dismantling the machine
61

- Discharge the carburettor by unscrewing the
discharge screw and using a suitable container
(Fig. 101).
101
- Discharge the engine oil.
Proceed with the disassembly of the individual machine components grouping them together according
to their composition. The machine consists mainly of parts made of steel, stainless steel, cast iron,
aluminium and plastic material.
Finally, proceed with the disposal of the parts according to the laws in force in the user’s country.
During all the phases of demolition, comply carefully with the safety warnings given in this
manual.
62
Putting the machine out of operation
and dismantling the machine

MAINTENANCE 11
This chapter includes instructions concerning the preventive, routine and additional maintenance
operations. In the specifications for the preventive maintenance operations for the various devices
indication is also given of the frequency of such procedures. Before consulting the chapter, read Chapter
4 “Precautions for use and maintenance” with care.
11.1 General notes ..................................................................................................................... 64
11.2 Preventive maintenance ..................................................................................................... 64
11.3 Changing the lubricant oil ................................................................................................. 65
11.4 Transmission belt ............................................................................................................... 66
11.4.1 Checking the transmission belt .............................................................................. 66
11.4.2 Disassembling the belt to be replaced ................................................................... 67
11.5 Air intake filter ................................................................................................................... 68
11.6 Active carbon filter and molecular sieve .......................................................................... 69
11.7 Refill hose ........................................................................................................................... 70
11.8 Intake and discharge valves .............................................................................................. 71
11.9 Condensate discharge ....................................................................................................... 71
11.10 Cylinders ............................................................................................................................ 71
11.11 Internal combustion engines ............................................................................................. 71
11.11.1 Maintenance programme ...................................................................................... 72
11.11.2 Oil change .............................................................................................................. 72
11.11.3 Air filter .................................................................................................................. 73
11.11.4 Sediment sump ...................................................................................................... 74
11.11.5 Spark plugs ............................................................................................................ 75
11.11.6 Minimum carburettor regulation.......................................................................... 77
11.11.7 Fuel filter ................................................................................................................ 77
11.12 Check of safety devices ..................................................................................................... 78
11.12.1 Check of the safety valve ...................................................................................... 79
11.13 Maintenance operations .................................................................................................... 79
WARNING
All the routine and additional maintenance operations must be carried out with the machine at a standstill
(the compressor at a standstill) and with the power supply disconnected. The residue pressure in the
machine (pump circuit) must be eliminated. Any operation carried out on the machine must only be
undertaken having read and carefully applied the regulations listed in Chapter 4 “Precautions for use and
maintenance”.
DANGER
It is extremely dangerous, and therefore absolutely forbidden to cut or weld, by using flames
or electrically, pipes or containers that contains or have contained inflammable liquids.
In case of doubts, refrain from this operation, or however previously wash with non flammable
solvents (during cleaning operation wear a protective mask); it is also forbidden to cut or
weld near points that, due to their position, could lead to fire risks.
For all maintenance and lubrication operations concerning the internal combustion engine,
strictly comply with all the instructions detailed in the enclosed manual.
Maintenance
63

11.1
General notes
To keep the machine in good working condition, it must be cleaned very thoroughly. Having been designed
and built according to the most advanced technological criteria, this type of refill station requires very
limited preventive and routine maintenance operations. However, it is essential to follow the indications
given in this chapter very carefully and to follow the intervals between operations as suggested. During
the guarantee period no responsibility is taken for any damage or operating faults due to a failure to
comply with the regulations in force. The following paragraph enables all the routine and additional
maintenance operations carried out on the machine to be recorded. This paragraph should be filled in
carefully and any operations carried out to solve problems should also be reported.
11.2
Preventive maintenance
Table 2
INTERVALLI
DA VERIFICARE
ATTENDRE ITALIANO
Sostituzione cartuccia a carbone attivo,
vedi par. 11.7
Controllo livello olio compressore
1 gg 15 min 30 m in 25 h 50 h 125 h 250 h 500 h 1000 h 5000 h
o
o
Prima sostituzione olio compressore
o
Sostituzione olio compressore
o
Cartuccia filtro d'aspirazione
o o
Valvola di sicurezza finale, funzionamento
o
Valvola di carica, funzionamento e tenuta
o
Allineamento dell'ago del compressore con
lo O acompressore depressurizzato
o
Serraggio tubi di raffreddamento
o
Serraggio tubi di connessione
o
Tensione ed usura cinghia
o o
Sostituzione fruste
o
Valvole d'aspirazione e scarico 2° stadio e
3° stadio o
Separatore finale, pulizia interna
Serraggio di tutte le viti
Pulizia generale
Sostituzione contenitore esterno filtro
depuratore
Sostituzione testa 1° stadio
Funzionamento interruttori di sfiato ad alta
pressione
Scarico condensa nel compressore
aprendo leggermente sia la valvola di sfogo
che lo scarico manuale del serbatoio
Ispezionare il filtro per controllare il
funzionamento del galleggiante interno dello
scarico. La presenza di accumulo di
umidità indica funzionamento scorretto del
galleggiante. Sostituire su richiesta.
Sostituzione olio sintetico NITROX
o
o
o
o
o
o
o
o
o
o = sostituire
o = eseguire controllo, pulizia
64 Maintenance

Changing the lubricant oil
11.3
The quantity of oil for the lubrication of the pump unit must be checked every 25 hours.
To carry out this operation, see chapter 8 “Start and stop”.
The oil must be changed every 250 operating hours or yearly.
When changing the oil, it must be remembered that a mixture of different oils cannot be used.
The oil must have the following characteristics:
Table 2
Sump capacity
cu.cm.
litres/gallons
1500
1.5/0.476
Recommended oil
Viscosity of the oil
summer
winter
AEROTECNICACOLTRI SPECIAL SYNTHETIC
OIL
NITROX EZ 1000
above +10 °C (50 °F) SAE 20 W/40
from +10 °C a -15 °C (50° a 5 °F) SAE 10 W
below -15 °C (5 °F) SAE 5 W
Maximum tilt of the
compressor with the oil level
at maximum
degrees ~ 5
To change the oil, proceed as follows:
1 use a basin with a minimum capacity of 1.5 lt.
capacity under the oil discharge tap (Fig. 99).
102
2 Unscrew the hexagonal closing cap located in front of the oil discharge and discharge all the oil in the
sump by slightly sloping the compressor of some degrees.
3 Replace the hexagonal closing cap.
4 Carry out the filling operations as described in chapter 8 “Start and stop”.
WARNING
To dispose of waste oils follow the instructions given in chapter 10.2 “Disposal of waste products” with
great care.
Maintenance
65

11.4
Trasmission belt
11.4.1
Checking the transmission belt
The drive belt control involves measuring the flex herself.
This operation must be carried out every 50 machine
operating hours as described below:
1 remove the protective cover as shown on figures
103 by unscrewing the fixing screws.
103
2 By exerting a pressure of at least 5 Kg, check
that the belt does not flex by more than 5 mm.
compared to its original position (Fig. 104).
104
If this distance should exceed 5 mm., intervene by
loosening the motor fastening screws (for both
electric and fuel models) (Fig. 105), move the motor
away from the compressor by a few millimetres by
sliding it along the slots.
Tighten the motor fastening screws.
3 Carry out the measurement procedure again and
if necessary, repeat the operations until a
maximum distance of 5 mm. is reached.
105
4 Replace the covers securing the appropriate
screws tightly (see point 1).
66
Maintenance

Disassembling the belt to be replaced 11.4.2
Periodically replace the driving belt that is worn out.
In any case this operation has to be carried out every 1000 compressor operating hours.
To replace the belt:
1 remove the protection guards by unscrewing the
securing screws (Fig. 106).
106
2 Loosen the engine securing screws (Fig 107)
and approach it to the pumping unit making it
slide along slots.
107
3 Remove the worn out belt from pulleys and replace the belt housing it in the pulleys races.
4 Remove the engine and strongly lock with the two screws.
5 Check the belt tightening following the instructions detailed in the paragraph 11.4.1 “Checking the
transmission belt”.
6 Reassemble the protection guard.
Maintenance
67

11.5 Air intake filter
The intake filter must be checked to make sure it is in good order every 25 operating hours.
The filter is cleaned by blowing air inside the cartridge when it has been removed.
Replace the cartridge turning it by 60° compared to its initial position.
The filter must be replaced every 125 operating hours with the following procedure:
1 Unscrew the nut with a proper wrench (Fig. 108).
108
2 Press cap lightly and turn it in an anti-clockwise
direction (Fig. 109).
109
3 Remove the filter and replace it with a new one
(Fig. 110).
To order a new spare filter, refer to chapter 14
“Spare parts”.
110
68
Maintenance

Active carbon filter and molecular sieve
11.6
The cartridges must be replaced before the air becomes foul-smelling.
The quality of the air depends to a large extent on the condition of the filtering cartridge. For this reason,
it is important to comply with the intervals as specified.
The frequency of replacement has been calculated for use of the compressor with intake air at a temperature
of 20 °C (68 °F), see table 4. If the temperatures differ, apply the coefficients given in the following
table 3 to the duration of the filter:
Table 3
°C °F
Moltiplicative
coefficients
50 122 0.20
Table 4
MODEL
40 104 0.34
30 86 0.57
20 68 1
10 50 1.85
5 41 2.60
0 32 3.80
N° OF 10 LITRE CYLINDERS TO BE
REFILLED
VOLUME OF
FILTERED AIR
DURATION OF
THE FILTER
200 bar 300 bar m3 ore
DA VERIFICARE
MCH 6/EM 150 100 300 50
MCH 6/ET 150 100 300 50
MCH 6/SH 150 100 300 50
Check the sealing O-Rings and replace them if they are damaged. Leave the cartridge in the filter when
the compressor is not in use. Maintain a pressure of 40-70 bar inside the filter to prevent outside
dampness from getting in.
To replace the active carbon filter, proceed as follows:
- unscrew the external cap using a lever between
the screws “A” (Fig. 111);
111
Maintenance
69

- remove the exhausted cartridge and fit in the
new one (Fig.112);
112
- unscrew the used cartridge from the internal cap 113
(Fig. 113) and then screw in the new one;
- screw up the internal cap having lubricated or replaced the sealing O-Rings if they are worn and having
lubricated the threads of the external cap using silicone grease.
CAUTION
The used active carbon filter cannot be disposed of together with urban waste. To dispose of the active
carbon filter, follow the instructions given in chapter 10.2, “Disposal of waste products” with great care.
11.7 Refill hose
The refill hose must be in good condition especially in the area of the connections.
The plastic sheath that covers the hose must not show any signs of abrasion otherwise if any humidity
infilatrates, it could corrode the steel plait and reduce its resistance. The hose must be replaced
periodically (annually) and/or when it shows signs of wear. Failure to comply with this regulation could
cause serious danger to the operators. Make sure that the minimum radius of curvature of the hose is
not less than 250 mm.
To replace the refill hose:
1 unscrew the refill hose from the fitting positioned
on the active carbon filter (Fig.114).
114
2 With a dynamometric wrench (Fig.115) screw
the new refill hose to the same fitting (torque
wrench 15 Nm).
70
115
Maintenance

Intake and discharge valves
11.8
The valves can be removed for maintenance. The seats must be cleaned carefully using petrol and soft
brass or nylon brushes. Avoid using steel brushes or screwdrivers. The interval between maintenance
operations is 125 working hours. If any parts are damaged or worn, they must be replaced.
NOTE:
the valve replacement procedure must be carried out at the work bench by specialized technicians who
have specific equipment for the stripping operation.
In any case, it is preferable to contact AEROTECNICA COLTRI S.r.l. who will supply the necessary
technical assistance.
Condensate discharge
11.9
Condensate = water + oil = emulsion.
The colour of this emulsion has to be milky white, possible brown stains are acceptable.
In case of dark brown dense emulsion carry out the compressor maintenance. The condensate has to
be discharged every 10-15 minutes working.
Cylinders
11.10
After removing the cylinders, it is necessary to
check, when they are replaced, that the piston at
the maximum point and the upper edge of the
cylinder are on the same level (Fig. 116).
Adjust any differences that there may be by making
the base of the cylinder thicker using gaskets.
116
Internal combustion engines
11.11
The compressors are supplied with an instruction manual compiled by the engine manufacturer. In case
of doubt or for further information, refer to the specific engine manual.
CAUTION
Carry out all the operations described below either with the engine turned off or cold.
The intervals at which maintenance has to be carried out are shown in table 5 (in the next page).
Maintenance
71

11.11.1 Maintenance programme
Table 5
DA VERIFICARE
INTERVAL FOR PERIODIC SERVICING
To be carried out at the intervals or after
the number of operating hours shown,
whichever occurs first.
Engine oil
Air filter
UNIT
OPERATION
Check level
o
Change
o o
Check
o
Clean
o(1) Replacement
Sediment sump Clean
o
Spark plung Check-clean
o
Spark arrester
(optional)
Clean
At each use
o
First mounth
or 20 hours
Every 3
mounths or
50 hours
Every 6
mounths or
100 hours
Everyyear
or 300
hours
Valve clearance Check-adjustment
o(2)
Fuel tank and filter Clean o Replacement o(2)
Fuel pipes
Cheack (and replace
if necessary)
Every two year (2)
NOTE:
1) service more frequently in dusty areas.
2) These parts must be serviced by technical staff authorized by the manufacturer.
11.11.2 Oil change
To ensure that all the oil is discharged, empty it out when the engine is hot.
Remove the oil top up cap and the oil discharge
cap to discharge the oil (Fig. 117).
117
72
Maintenance

Screw up the oil discharge cap again and secure it tightly.
Top up with the type of oil recommended by the
manufacturer and check (Fig. 118).
Screw the oil top up cap.
118
DANGER
If the engine oil comes into constant contact with the skin, it can cause skin cancer. Although this is a
very remote possibility except for those who handle engine oil every day, it is still advisable to wash
hands well with soap and water as soon as possible after the work has been done.
NOTE:
the used engine oil removed must be disposed of according to the national laws in force concerning
such matters. We advise placing it in a sealed container and taking it to a service station for recycling.
CAUTION
The oil must be disposed of carefully and not into the environment (e.g. into wells, into the ground, etc.).
Air filter
11.11.3
If the air filter is dirty, it reduces the flow of air to the carburettor. To prevent damaging the carburettor,
service the air filter regularly. It should be serviced even more frequently if the engine is used in very
dusty areas.
CAUTION
Never clean the air filter with petrol or very inflammable solvents, otherwise it could lead to explosions or
fires.
WARNING
Never turn the engine on without the air filter as this would certainly damage it.
Maintenance
73

1 Remove the butterfly nut and the air filter cover
(Fig.119). Remove the filter parts and separate
them. Check the parts carefully to ensure they
are not perforated or damaged. If they are, replace
them.
119
2 Foam part (Fig. 120): wash the part in a
cleansing solution for domestic use and hot water
and dry well, or wash it in a solvent that is either
not or only slightly inflammable. Then leave it to
dry well.
Soak the part in clean engine oil and squeeze it
to get out all the excess oil.
NOTE:
if too much oil is left in the filter, the engine smokes
in a strange way as soon as it is started up.
120
11.11.4 Sediment sump
CAUTION
- The fuel is highly inflammable and may even explode. Do not smoke in the surrounding area and do
not allow naked flames or sparks near the engine.
- Once the sediment sump has been fitted, check that there are no leaks and that the whole area is free
of any spilt fuel before starting the engine.
74
Maintenance

Move the fuel valve to “CLOSE” (Fig. 121).
121
Remove the sediment sump and the “O” ring
(Fig. 122) then wash them in solvent that is either
non-inflammable or only slightly inflammable. Leave
them to dry well and then replace them. Open the
fuel cock and check that it does not leak.
122
Spark plugs
11.11.5
WARNING
Never use a spark plug with an unsuitable thermal range. In order for the engine to perform well, the
spark plug must be clean and the electrodes must be at the right distance.
1 Remove the cap from the spark plug and use a
spark plug key of the right size to remove the
spark plug (Fig. 123).
123
Maintenance
75

CAUTION
If the engine has been running, the silencer will be very hot. Take care not to get burnt.
2 Inspect the spark plug to check that it is not worn and that the insulator is not chipped or damaged.
If this is the case, the spark plug must be replaced. Finally clean the spark plug with a steel brush.
3 Measure the distance between the spark plug
electrodes using a thickness gauge, and correct
it if necessary by bending the upper electrode.
The distance must be: 0,70 - 0,80 mm
(Fig. 124).
124
4 Check that the spark plug washer is in good condition. Screw in the spark plug by hand to avoid
damaging the thread.
5 Once the spark plug rests on the base, tighten it
with a key for spark plugs so that it squeezes
the washer (Fig. 125).
125
NOTE:
when a new spark plug is fitted, tighten it by 1/2 a turn once it has been positioned so that it squeezes
the washer. When a used spark plug is fitted again, tighten it by 1/8 – 1/4 of a turn until it has been
positioned so that it squeezes the washer.
WARNING
The spark plug must always be tightly secured. If the spark plug is not tightened sufficiently, it may
overheat and damage the engine.
76
Maintenance

Minimum carburettor regulation
11.11.6
Start up the engine and allow it to reach normal operating temperature.
Use the accelerator setscrew (Fig. 126) with the
engine running at a minimum to achieve the
standard minimum speed that is 1400÷150 r.p.m.
126
Fuel filter
11.11.7
The fuel filter must be cleaned according to the intervals described (see Maintenance table, pg. 72), a
regular operating performance from the engine depends on this.
To carry out this operation, proceed as follows:
- unscrew the securing screws positioned under
the fuel cock (closed position, clockwise lever)
and remove the filter (Fig.127).
127
Maintenance
77

- Have a container suitable for holding the fuel nearby, of a sufficient capacity to contain the quantity of
fuel;
- empty the fuel tank by opening the fuel cock
(open position, counter-clockwise lever)
(Fig.128).
128
- Wash the filter with diesel and blow compressed air into it (if necessary replace it).
- Replace the filter, screw up the fuel cock and finally screw up the discharge cap once again.
11.12 Check of safety devices
Periodically check, at least every month, and after each maintenance operation, the perfect operating
condition of the machine safety devices. Refer to their list and position, chapter 4 “Precautions for use
and maintenance”.
Check that all the devices are tightly fit in their position.
CAUTION
Check, with the machine energized, the efficiency of safety devices.
Check that momentarily cutting the power supply or switching off the fuel engine, during the machine
operation, the machine immediately enters an emergency condition.
Check that after an emergency the machine cannot be started until it is reset.
CAUTION
Check the emergencies of the internal combustion engine in the enclosed manual.
78
Maintenance

Check of the safety valve
11.12.1
The final safety valve protects the bottles from an excessive filling; it is calibrated when the compressor
is tested.
The safety valve has to be checked every refill; after having mounted the bottle fitting, start the compressor
with the bottle cocks closed. Check the correct operation of the safety valve with the manometer, open
the cocks and refill.
DANGER
In case of anomalies concerning the failure of the safety valve contact the technical assistance
of AEROTECNICA COLTRI srl.
Maintenance operations
11.13
Use the following pages to note the routine and additional maintenance operations carried out on the
machine.
If the maintenance programme is filled in accurately, it will be easier for the technician to intervene if
assistance is required.
Date: ..................................................................................................................................................
Operation carried out: .........................................................................................................................
Date: ..................................................................................................................................................
Operation carried out: .........................................................................................................................
Date: ..................................................................................................................................................
Operation carried out: .........................................................................................................................
Date: ..................................................................................................................................................
Operation carried out: .........................................................................................................................
Date: ..................................................................................................................................................
Operation carried out: .........................................................................................................................
Date: ..................................................................................................................................................
Operation carried out: .........................................................................................................................
Date: ..................................................................................................................................................
Operation carried out: .........................................................................................................................
Date: ..................................................................................................................................................
Operation carried out: .........................................................................................................................
Date: ..................................................................................................................................................
Operation carried out: .........................................................................................................................
Maintenance
79

Date: ..................................................................................................................................................
Operation carried out: .........................................................................................................................
Date: ..................................................................................................................................................
Operation carried out: .........................................................................................................................
Date: ..................................................................................................................................................
Operation carried out: .........................................................................................................................
Date: ..................................................................................................................................................
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80
Maintenance

TROUBLESHOOTING
12
This chapter describes the faults that may arise during machine operation.
For each fault, the cause and the solution to be adopted are specified.
12.1 List of faults ........................................................................................................................ 81
List of faults
12.1
Table 1 and 2 below lists all the faults that may arise during operation and the relative solution.
Table 1
MODEL WITH ELECTRIC ENGINE
PROBLEM CAUSE SOLUTION
The electric motor does not start. A phase is missing.
Check the fuses.
The safety valve discharges.
The speed of rotation and
capacity are reduced.
The valve is not working.
The motor power is insufficient.
The belt slips.
The valves are not working.
The 3 rd stage piston is worn.
The connections are loose or the
The capacity is reduced without a
gaskets leak.
reduction in the speed of rotation.
The intake filter is blocked.
Smell of oil in the air.
The compressor overheats.
The intake extension is bent.
The piston or compression rings
ar worn.
The filter cartridge is worn.
The compression rings are worn.
Wrong direction of rotation.
The cooling pipes are dirty.
The valves are not completely
closed (causing an overload of
another stage).
Perform maintenence operations
or replace the valve.
Check the motor and the power
line.
Tighten the belt.
Contact the technical assistance
service.
Contact the technical assistance
service.
Check the leaks with water and
soap and eliminate them.
Replace it.
Straighten it, use a semi-rigid
pipe.
Contact the technical assistance
service.
Replace it.
Contact the technical assistance
service.
Check the direction of rotation by
inverting the two phases in the
plug.
Contact the technical assistance
service.
Contact the technical assistance
service.
DA VERIFICARE
Troubleshooting
81

Table 2
MODELS WITH AN INTERNAL COMBUSTION ENGINE
DA VERIFICARE
PROBLEM CAUSA SOLUTION
When the pulley starting is
used, the engine does not start.
The engine switch is on OFF.
The oil in the engine is below the
minimum level.
The fuel cock is closed.
There is no fuel.
The fuel does not reach the
carburettor.
The spark plug does bot produce
any sparks.
Move the switch to ON.
Top the oil up to the level.
Open the cock.
Add fuel.
Check by loosening the carburettor
discharge screw with the fuel cock
open.
Clean the spark plug.
Replace the spark plug.
82
Troubleshooting

REGISTERS
13
This chapter deals with the compressor accompanying books that we advise to keep available near
the compressor itself.
13.1 Machine log book .............................................................................................................. 83
Machine log book 13.1
It is obligatory to display a machine log book (register), which contains refill gas registration and the
following list of information.
The machine log book should NOT be made up of loose pages and must be durable.
It must contain at least the following information:
- date;
- tank matriculation number;
- check on oxygen (O 2
) content by qualified company and signature;
- operator check for oxygen content (O ) and signature;
2
- “mod” Form filled out by hand by the operator (in depth explanation of operation);
- company that certificates the nitrox and file number.
Registers
83

14
MACHINE DIAGRAMS
This chapter provides the plans and diagrams of the systems installed on the machine.
14.1 NITROX compression diagram ......................................................................................... 84
14.2 Compression diagram - only air ........................................................................................ 85
14.3 Electricals diagrams........................................................................................................... 86
14.1
NITROX compression diagram
NUOVO SCHEMA
84 Machine diagrams

Compression diagram - only air 14.2
NUOVO SCHEMA
Machine diagrams
85

14.3
Electricals diagrams
NUOVO SCHEMA ELETTRICO
86
Machine diagrams

SPARE PARTS
15
15.1 Exploded view of the machine parts .............................................................................. 87
Pumping unit .................................................................................................................. 88
MCH 6/EM EXPLORER NITROX and MCH 6/ET EXPLORER NITROX cooling plant frame ... 90
MCH 6/SH EXPLORER NITROX cooling plant frame .................................................... 92
Active carbon filter and condensate separator ............................................................. 94
Exploded view of the machine parts
15.1
Spare parts
87

88
Pumping unit
Spare parts
60
42A
49
42B
51
50
41
88
86
85
87
39
38
45
44
43
46
48
48
47
12
89
01
37
06
02
06
08
09
71
61
65
72
62
70
62
63
64
67
66
68
06
07
05
04
77
03
94
79
80 80
78
83
84
82
81
74
95
24
25
22
23
28
27
28
26
21
39
38
73
29
75
55
52
76
101

Pumping unit
POSIZ. CODICE DESCRIZIONE
01 6-00-008 FLANGIA PICCOLA
02 OR-2250 O-RING 2250 NBR 70
03 6-00-001 MONOBLOCCO
04 6-00-009 FLANGIA GRANDE
05 OR-2300 O-RING 2300 NBR 70
06 6-00-011 CUSCINETTO -6302- 42x13x15
06 6-01-006 CUSCINETTO BIELLA SCE 188
07 6-00-003 COLLO D'OCA
08 6-00-002 DISTANZIALE
09 6-00-005 CONTRAPPESO
12 6-00-004 PARAOLIO 15x35x7
21 6-01-008 TESTA 1° STADIO
22 6-01-009 GUARNIZIONE TESTATA 1° STADIO
23 6-01-001 CILINDRO 1° STADIO
24 OR-2325 O-RING 2325 NBR 70 (82,28x1,78)
25 6-01-005 BIELLA 1° STADIO
26 6-01-003 PISTONE DIAM. 78 COMP. SEGMENTI
27 6-01-007 SPINOTTO PIST. 1° STADIO 36x12
28 SEEGERJ12 SEEGERJ12
29 6-01-015 COPERCHIO TESTATA 1° STADIO
37 6-00-031 DISTANZIALE
38 RACC1014 RACC. DIAM. 10 1/4 C3xS10-1/4
39 6-01-019 TUBO 1° STADIO DIAM. 10 (D)
41 6-02-006 TESTA 2° STADIO
42/A 6-02-004 GUARNIZIONE RAME VALVOLA 2° STADIO
42/B 6-02-007 GUARNIZIONE RAME VALVOLA 2° STADIO
43 6-02-001 CILINDRO 2° STADIO
44 OR-40x2 O-RING 40x2 NBR 70
45 6-02-003 PISTONE DIAM. 38 COMP. SEGMENTI
46 6-02-005 BIELLA 2° STADIO
47 6-02-002 SPINOTTO 31,5x12
48 SEEGERJ12 SEEGERJ12
49 6-02-008 CORPO VALVOLA 2° STADIO
50 6-02-010 MOLLA VALVOLA 2° 3° STADIO
51 6-02-009 DISCO VALVOLA 2° 3° STADIO
52 6-02-011 RACCORDO CILINDRO 2° STADIO
55 6-01-021 STAFFA AD "L"
60 VITE0660 VITE T.C.E. ZINC. 6x60 DIN 912
61 6-03-008 TESTA 3° STADIO
62 6-03-009 GUARNIZ. RAME VALVOLA 3° STADIO
63 6-03-001 CILINDRO 3° STADIO
64 OR-2093 O-RING 2093 NBR 70
65 VITE0655 VITE T.C.E. ZINC. 6x55 DIN 912
66 6-03-003 PISTONE DIAM. 19
67 6-03-005 BIELLA 3° STADIO
68 6-03-006 SPINOTTO 17x7
70 6-01-010 CORPO VALVOLA 3° STADIO
71 6-02-010 MOLLA VALVOLA 2° 3° STADIO
72 6-02-009 DISCO VALVOLA 2° 3° STADIO
73 VITE0680 VITE T.C.E. ZINC. 6x80 DIN912
74 6-04-003 CILINDRO 4° STADIO
75 6-01-025 GUARNIZIONE COPERCHIO TESTATA
76 OR-2106 O-RING 2106 NBR 70
77 6-04-005 BIELLA 4° STADIO
78 6-04-004 PISTONE DIAM. 9,5
79 6-04-006 SPINOTTO 22x7
80 SEEGERJ12 SEEGERJ12
81 6-04-007 TESTA 4° STADIO
82 6-04-008 GUARNIZ. RAME TESTA 4° STADIO
83 6-02-009 DISCO VALVOLA 2° 3° STADIO
Spare parts
89

MCH 6/EM EXPLORER NITROX and MCH 6/ET EXPLORER NITROX
cooling plant frame
90
Spare parts

MCH 6/EM EXPLORER NITROX and MCH 6/ET EXPLORER NITROX
cooling plant frame
NUOVA DISTINTA
Spare parts
91

MCH 6/SH EXPLORER NITROX cooling plant frame
92
Spare parts

MCH 6/SH EXPLORER NITROX cooling plant frame
NUOVA DISTINTA
Spare parts
93

Active carbon filter and condensate separator
18
03
20B
20A
01
02
03
08
08
04
10
11
H
I
06
05
B
A
D
E
C
12
23
G
F
22
12
13
15
03
16
17
12
07
15
26
21
27
03
14
O
P
24
25
L
M
N
94
Spare parts

Active carbon filter and condensate separator
POSIZ. CODICE DESCRIZIONE
01 6-05-001A MANIMETRO
02 6-05-002 TAPPO SUPERIORE SEPARATORE
03 OR-136-4112 O-RING
04 6-05-015 GUARNIZIONE PRIMO STADIO
A: CORPO ANTERIORE REGOLAZIONE
B: MOLLA
C: CORPO INTERNO
D: O-RING
E: CORPO CENTRALE
F: SEDE TENUTA NYLON
G: MOLLA
H: RACCORDO
I: O-RING
05 6-05-005 SEPARATORE DI CONDENSA
06 06-1890 RACCORDO 6 1/8 90°
07 6-05-007 TUBO DIAMETRO 6 AD "L"
08 6-05-008 STAFFA PORTASEPARATORE
09 VITE0630 VITE A BRUGOLA
10 RON61 RONDELLA
11 DA0062 DADO
12 RACC0618 RACCORDO 6 1/8
13 6-05-013 TUBO DIAMETRO 6 AD "S"
14 6-05-014 TAPPO INFERIORE FILTRO
15 6-05-004 RUBINETTO SCARICO CONDENSA
16 6-05-016 DIFFUSORE SEPARATORE
17 6-05-017 TAPPO INFERIORE SEPARATORE
18 6-05-018 TAPPO SUPERIORE FILTRO
20A SC000340 CARTUCCIA FILTRO A CARBONE
20B
CARTUCCIA FILTRO A CARBONE
21 6-05-021 FILTRO
23 SC000460 FRUSTA 1,20 MT
24 6-05-024 ATTACCO DIN 200 BAR
O: GHIERA
P: RACCORDO
25 6-05-025 ATTACCO A STAFFA INT
L: VITONE
M: STAFFA
N: POMELLO
26 6-05-026 STAFFA PORTAFILTRO
27 6-05-027 MOLLA FILTRO
Spare parts
95

16
ANNEXES - MINI O2DII
16.1 Introduction ..................................................................................................................... 96
16.2 Controls ........................................................................................................................... 97
16.3 Air calibration ................................................................................................................. 97
16.4 Operation ......................................................................................................................... 98
16.5 Accessories ..................................................................................................................... 98
16.6 Troubleshooting .............................................................................................................. 99
16.7 Maintenance .................................................................................................................... 99
16.8 Care of the Mini O2DII ..................................................................................................... 100
16.9 Safety information for the Mini O2DII ............................................................................ 100
16.10 Informaton on handling of the sensor ............................................................................ 101
16.11 Details .............................................................................................................................. 101
16.1 Introduction
The Mini O2DII oxygen analyser has been designed to measure oxygen levels from between 0.1 and
100%.
The analyser is used to check levels of oxygen present in cylinders or monitoring a gas mixing control
panel, but should never be used for both operations at the same time.
If the analyser is used to measure the level of oxygen coming out of a mixing panel, a second Mini
O2DII should be used to check the cylinders.
The Mini O2DII has a large display and works thanks to an oxygen electrochemical sensor with an
internal temperature compensated for at least two years.
Energy is supplied by a 9V, 4000 hour battery that enables operation for three years before it has to be
changed.
The Mini O2DII, an autonomous unit, water and shock resistant, has been designed specifically for
underwater sector – sport (NITROX), commercial and military – where hostile environmental conditions
are the norm and not the exception.
The Mini O2DII is supplied ready to use. A seal is fixed to the front of the sensor to protect it, this
should be removed before use.
Check the machine for any damage and check that the seal on the sensor is intact.
Contact the supplier in the event of damage to the machine or if the seal has been broken or not in the
correct place.
CAUTION
Read these instructions before using the analyser!
96
Annexes - Mini O2DII

Controls
16.2
The analyser has an in-built on/off switch which is at the side or on the front of the machine. Move the
switch upwards or downwards to switch the machine on and move it to the central position to switch it
off. When the unit is switched on, the screen of the analyser will show an oxygen value but the machine
should not be used until after calibration (see section 3.0). The flat battery signal is a symbol in the
form of a battery that appears in the corner of the screen. If it appears, change the battery before using
the instrument (see section 7.0 Maintenance). At the front of the machine there is an impermeable
calibration handle. Turn it fully from left to right and then fully to the left, the reading should increase and
then decrease. (If the reading does not change, see section 7.0 Maintenance).
CAUTION
DO NOT use when the FLAT BATTERY symbol appears!
OXYGEN ANALYSER MINI O2DII
Air calibration
16.3
Before using the machine it is essential to carry out the air calibration each time. The instructions are
as follows:
- make sure that the sensor seal and any other flow adapter has been removed and that the reading on
the screen has stabilised.
- Expose the analyser to clean air for two minutes and regulate the calibration handle until the screen
shows 20.9 (if not possible, refer to paragraph 3.4 or to the Maintenance section).
- Normal calibration is sometimes not possible at very high altitudes. In this case check the real
pressure in BARS and multiply by the percentage of atmospheric oxygen (20.9%). Therefore, set the
reading during calibration to the level calculated (equal to the percentage of oxygen at the surface).
When measuring the level of oxygen in the sample, divide the reading by the same atmospheric
pressure value to obtain the real percentage of oxygen present in the sample.
- For example: At an atmospheric pressure of 0.8 BAR corresponds to a percentage of oxygen at the
surface of 20.9% x 0.8 = 16.7% O 2
. If the sample reading is 32.0%, this value should be divided by
0.8 to obtain the real percentage of oxygen, 32.0/0.8 = 40.0% O 2
real percentage.
The analyser is now ready to measure oxygen.
CAUTION
The analyser is sensitive to partial oxygen pressure. Calibration must always be carried out at
the same atmospheric pressure as the oxygen measurement.
Annexes - Mini O2DII
97

16.4 Operation
The analox Mini O2DII is supplied with a single DII adapter that enables the analyser to be connected
directly to the outlet of the nitrox tank.
Make sure that the sensor seal has been removed.
Connect the DII adapter to the analyser pushing the adapter onto the turret of the sensor.
The O-ring on the sensor makes fastening easy.
Hold the DII adapter, turned towards you, firmly against the cylinder outlet.
Slowly open the cylinder valve until gas can be heard hissing through the flow adapter.
CAUTION
Open the cylinder valve VERY CAREFULLY
Close the cylinder valve after fifteen seconds when the Mini O2DII shows a stabilised reading.
If in doubt, carefully repeat the process and make sure the flow of gas is gentle.
A couple of seconds after the gas flow has stopped, the reading will begin to change to the surrounding
level of air of 20.9% O 2
, the reading should therefore be taken when the gas flow is open.
CAUTION
Do not pressurise the sensor as the readings will be inexact.
16.5 Accessories
Transport / Storage
The box supplied contains the MiniO2 DII, adapter and paper for correcting humidity.
98
Annexes - Mini O2DII

Troubleshooting
16.6
SYMPTOM REASON SOLUTION
Batterysymbol. Flat battery. Change the battery.
Empty screen.
Zero reading.
Irregular reading.
Reading does not change when the
calibration handle is turned.
Switched off.
Bad connection.
Sensor not inserted.
Expired sensor.
Pressure on the sensor.
Radio transmission.
Old or faulty sensor.
Condensation on sensor.
Faulty connections.
Sensor broken.
Switch on.
Check screen connection.
Check battery connection.
Check connection.
Check sensor.
Check flow.
Move the machine away.
Replace sensor.
Dry the face of the sensor.
Check connections.
Replace sensor.
Sections of the screen are missing. Faulty screen. Return to vendor.
Impossible to calibrate.
Varied Reading.
Faulty sensor.
Sensor not in the air.
High altitude.
Rapid temperature changes.
Replace sensor.
Check the flow adpter.
Calculate percentage equivalent to
20.9 x bar.
Do not move the analyser from one
temperature to the next immediately
before use.
Maintenance
16.7
Replacing the battery:
a) unscrew the 4 screws that are in each corner of the apparatus and lift the cover carefully.
b) Slid the battery from the spring support and disconnect the electrical wire.
c) Connect the electric wire to the new battery and slide the battery behind the spring support.
d) Replace the cover carefully and replace the screws making sure that the sensor is well connected.
e) Make sure that the wires are not trapped.
Replacing the sensor:
a) serial number for replacing the sensor: 9100-9212-5A
b) Remove the 4 screws that are in each corner of the machine and lift the cover carefully.
c) Take out the flow adapter if installed and slide the sensor out of the cover.
d) Disconnect the online connections from the sensor.
e) Destroy the old sensor according to local regulations in force regarding materials containing lead
and potassium hydroxide solutions.
f) Take the new sensor out of its bag and check for any leakage. Connect it to the online sensor
connections and slide it through the cover.
g) Replace the cover carefully and replace the screws making sure that the sensor is well connected.
Make sure that the wires are not trapped.
Annexes - Mini O2DII
99

16.8 Care of the Mini O2DII
Even though the Mini O2DII has been designed to be water resistant, avoid immersion in liquids and do
not leave outside without protection.
The Mini O2DII has been built to withstand minimal blows or falls but being a precision oxygen
analyser it should be taken care of to guarantee correct long term efficiency.
Use a damp cloth to clean the Mini O2DII.
Protect the Mini O2DII from direct sunlight for long periods and do not expose it to extreme
temperatures both high and low.
The Mini O2DII sensor is an electrochemical mechanism containing a corrosive electrolyte.
Always check that it is not leaking and avoid contact with parts of the body or clothes.
In the event of contact with the electrolyte, wash the effected part abundantly with water – see Safety
Instructions.
ANALOX 9212
OXIGEN SENSOR
CAUTION
If you notice a slimy or burning sensation in your fingers or
other parts of the body after having worked on the sensor,
wash abundantly with water. If the burning sensation
persists, call a doctor!
16.9 Safety information for the Mini O2DII
Flat batteries should be destroyed according to the local regulations in force.
Used sensors or those that leak or are damaged in another way, should be destroyed safely according
to the local regulations in force.
The sensor contains KOH, a potassium hydroxide solution, a dangerous substance, which can cause
the following effects:
CAUTION
SKIN:
INGESTION:
EYES:
potassium hydroxide is corrosive – contact with the skin can cause a
chemical burn.
can cause injury or be fatal if ingested.
contact with the eyes can cause permanent loss of sight.
FIRST AID PROCEDURE:
SKIN:
INGESTION:
EYES:
wash the affected part abundantly with water and take off contaminated
clothing. If burning persists, call a doctor.
drink large quantities of fresh water. Do not induce vomiting. Call a doctor.
wash abundantly with water for at least 15 minutes and call a doctor immediately.
100
Annexes - Mini O2DII

Information on handling of the sensor
16.10
MiniO2DII oxygen sensors are usually supplied in sealed bags.
Before opening the bag make sure that there is no leakage from the sensor.
The sensors are also sealed and in normal circumstances are not dangerous to health.
Nevertheless, if there has been a leakage of potassium hydroxide from the electrolyte, use rubber
gloves and wear protective glasses for use with chemicals when handling or cleaning it.
Rinse contaminated surfaces with water.
Details
16.11
Interval
Precision
Definition
Reaction time
0. 1 – 100.0% Oxygen.
+/- 1% of the reading.
0.1% Oxygen.
90% in less than 15 seconds.
Type of sensor Analox 9212-5.
Sensor life
Battery
Battery life
Operating temperature
Storage temperature
Pressure
More than 36 months in air24 months
guarantee in air.
Alkaline 9V (PP3).
4000 hours. Up to 36 months of continuous use.
From -5° a 50 °C.
From -5° a 50 °C.
Sensitive to partial oxygen pressure.
Annexes - Mini O2DII
101

AEROTECNICA COLTRI S.r.l.
Sede legale: Via Rio Ponale, 7 - 25010 Rivoltella di Desenzano D/Garda - BRESCIA - ITALY
Stabilimento: Via Colli Storici, 177 - 25010 San Martino della Battaglia - BRESCIA - ITALY
Tel. 030 9910297 - 030 9910301 - Fax 030 9910283
e-mail: coltrisub@coltrisub.it Internet: http://www.coltrisub.it