Portamess 911 Oxy - Knick Elektronische Meßgeräte GmbH & Co.

User Manual
Portamess® 911 Oxy
SE 302 / SE 303

Warranty
Defects occurring within 3 years from delivery date shall be remedied
free of charge at our plant (carriage and insurance paid by sender).
Sensors and accessories: 1 year.
Subject to change without notice.
Return of products
Please contact our Service Team. Ship the cleaned device to the
address you have been given.
If the device has been in contact with process fluids, it must be
decontaminated/disinfected before shipment. In that case,
please attach a corresponding certificate, for the health and
safety of our service personnel.
Disposal
Please observe the applicable local or national regulations
concerning the disposal of “waste electrical and electronic
equipment”.
Knick
Elektronische Messgeräte
GmbH & Co. KG
Beuckestr. 22
14163 Berlin, Germany
Tel. +49-30-80191-0
Fax +49-30-80191-200
Internet: http://www.knick.de
knick@knick.de

Conventions Used in this Manual
ITALICS are used for texts which appear in the
Portamess® 911 Oxy display.
Bold print is used to represent the texts of keys, e.g.
cal.
Display examples
or
keys whose functions are explained are frequently
shown in the left-hand column.
Note
Notes provide important information which should
always be observed when using the meter.
Caution
Caution means that the instructions given must
always be followed to prevent malfunctions or
damage to the device.
Warning
Warning means that the instructions given must
always be followed for your own safety. Failure to
follow these instructions may result in injuries.
Information
3

Safety Information
Be sure to read and observe the following instructions!
Whenever it is likely that the protection has been impaired, the meter shall
be made inoperative and secured against unintended operation.
The protection is likely to be impaired if, for example:
• the meter shows visible damage
• the meter fails to perform the intended measurements
• after prolonged storage at temperatures above 70 °C
• after severe transport stresses
Before recommissioning the meter, a professional routine test in accordance
with EN 61 010-1 must be performed. This test should be carried out by the
manufacturer.
Information
4

EC Declaration of Conformity
Information
5

Table of Contents
Conventions Used in this Manual................................................ 3
Safety Information........................................................................ 4
Be sure to read and observe the following instructions!................. 4
EC Declaration of Conformity...................................................... 5
1 The Model 911 Oxy .................................................................... 9
Package contents .......................................................................................... 9
Intended use / Short description ............................................................ 9
2 Operation ................................................................................. 11
Meter design .................................................................................................11
Display .............................................................................................................12
Keypad .............................................................................................................13
Connection and start-up ..........................................................................14
How to handle meter and sensors ........................................................16
Configuration ................................................................................................17
Calibration.......................................................................................................18
3 Troubleshooting ...................................................................... 23
Sensoface® .....................................................................................................23
4 Maintenance ............................................................................ 25
Changing the batteries .............................................................................25
Cleaning the meter .....................................................................................26
5 SE 302 / SE 303 Dissolved Oxygen Sensors ........................... 27
Safety precautions for sensor handling...............................................28
Commissioning the SE 302 / SE 303 sensors......................................28
Polarization.....................................................................................................29
Sensor operation..........................................................................................29
Sensor maintenance....................................................................................30
Replacing the membrane and electrolyte..........................................30
Sensor cleaning and servicing.................................................................31
Storage of SE 302/SE 303...........................................................................32
Sensor accessories: protection sleeve/immersion weight............32
Table of Contents
6

Appendix ..................................................................................... 33
Product line and accessories....................................................................33
Specifications for Model 911 Oxy...........................................................34
Specifications for SE 302 / 303 sensors................................................36
Glossary....................................................................................... 37
Index ............................................................................................ 38
Table of Contents
7

1 The Model 911 Oxy
Package contents
Please check the completeness of the shipment after
unpacking.
The package should include:
• Model 911 Oxy incl. batteries and sensor quiver
• Carrying strap
• User manual
Intended use / Short description
• The Model 911 Oxy serves for simultaneous measurement
of temperature and dissolved oxygen in water
taking account of the barometric pressure.
• Temperature compensation is automatic using an
NTC 22 kΩ.
• The meter complies with the European EMC
regulations.
• The meter is IP 66 protected to EN 60 529 (jet water
from all directions).
• Only three alkaline AA (LR6) batteries are required for
uninterrupted operation for approx. 1000 hours.
• Sensor connection via SixPlug.
• Automatic calibration in air can be performed directly
in the sensor quiver.
• Thanks to the continuous polarization of the
connected sensor, it is always ready to use.
The Model 911 Oxy
9

• To prolong battery life, the meter switches off automatically
when it is inactive for either one hour or twelve
hours.
The Model 911 Oxy
10

2 Operation
Meter design
1 Connector for dissolved oxygen sensor
2, 3 Not used
4 Not used
5 Sensor quiver, removable
Operation
11

Display
1 Sensor data very good (Sensoface®, page 23)
Sensor data still acceptable
Sensor must be checked
2 Replace battery
3 Press cal key
4 Wait
5 Measurement units (main display)
6 Measurement units (secondary display)
7 Main display
8 Secondary display
9 Error message
10 Slope and zero point
Operation
12

Keypad
▲
▼
Switches the meter on or off. After power-on, the meter
automatically performs a self-test.
Returns the meter to the measuring mode from any
function. The meas key can also be used to switch the
meter on.
Select and change parameters (or modes).
Starts calibration.
Note
+
Opens the configuration menu. Meter must be
switched off. Keep the cal key depressed and then
press the on/off key.
When pressing down two keys simultaneously, make
sure that the left key of the illustration is pressed first.
Operation
13

Connection and start-up
Sensor connection
SE 302
SE 303
ZU 0554
ZU 0555
Note
The meter can be combined with the following dissolved
oxygen sensors from our range of accessories.
Dissolved oxygen sensor with integrated NTC temperature
detector (1.5-m cable / SixPlug)
Immersion sensor with integrated NTC temperature
detector (5-m cable / SixPlug)
An adapter cable allows connection of various
commercial dissolved oxygen sensors:
For connection of process sensors with 4-pole cap
For connection of process sensors with VP cap
When using commercial sensors, please contact Knick
Elektronische Messgeräte GmbH & Co. KG to ensure
compatibility between sensor and Model 911.
How to connect the sensor via SixPlug
Notch
Plug
Tab
Socket
• Slightly insert the plug into the socket and turn it
until the tab in the socket seats in the plug notch.
• The plug will then slip deeper into the socket.
• To tighten the assembly, shift the knurled nut over
the plug and turn it clockwise until the stop.
Caution
Safe electrical contact is only made when the knurled
nut is screwed on until the stop.
Operation
14

Terminal assignments
Connection.................................................Socket
Connector for dissolved oxygen sensor..................... 1
n. c........................................................................................2, 3
n. c............................................................................................ 4
Cathode
Anode
NTC 22 kΩ
Note
All calibration and configuration data remain permanently
stored even if the meter is switched off or the batteries are
removed (battery replacement).
Operation
15

Note
Pressing on/off switches the meter to measuring mode.
At power-on, the meter performs a self-test:
• Simultaneous lighting-up of all display segments
• Display of model designation 911
• Display of software version
The meter can also be switched on with the meas key.
In that case only a short check is performed.
How to handle meter and sensors
Caution
The sensor quiver
The sensor can be kept permanently in the sensor quiver
of the meter. A moisturized fleece in the quiver prevents
the sensor from drying out.
How to store the sensor in the quiver:
• Take the fleece out of the empty quiver, moisten it and
put it back into the quiver.
• Remove the protection cap from the sensor.
• Insert sensor into the quiver.
Be sure to keep the fleece in the quiver moist.
• Switch the Model 911 Oxy on. If required, polarize the
sensor for 6 hours (see page 29).
Operation
16

Configuration
+
Activate configuration:
Keep the cal key depressed and then press the on/off
key.
The meter acknowledges activation of configuration
mode.
Press cal to proceed.
Salinity.
Adjust using arrow keys: 0 - 45
Press cal to confirm.
Selection of concentration (mg/l) / saturation (%)
Display formats: xx.xx mg/l / xx.x mg/l / xxx.x % / xxx %
(Select using arrow keys.) Press cal to confirm.
Calibration interval.
Adjust using arrow keys: 0 - 14 (days)
Press cal to confirm.
Auto switch-off (Display off when meter not active).
Select using arrow keys: 1 / 12 (hours)
Press cal to confirm.
Select measurement unit for temperature display.
Select using arrow keys: °C/°F
Press cal to confirm.
Operation
17

Calibration
Regular calibration of the sensor slope is required to
obtain precise measurement results.
The SE 302/303 sensors have a very low zero point current.
A zero calibration is therefore not required (see page 36).
If other dissolved oxygen sensors with different offset
characteristics are connected via adapter, a zero
calibration is possible.
Caution
Caution
Prior to initial start-up or after the sensor has been disconnected
from the meter for more than 5 minutes, the sensor
must be polarized before calibration or measurement
(see page 29).
Without calibration every dissolved oxygen meter delivers
an imprecise measured value! Especially after replacing
the DO sensor, the electrolyte, or the sensor membrane,
you must perform a calibration!
For 2-point calibration, perform zero calibration first.
Operation
18

Calibration – Slope
Place sensor in water-saturated air, e.g.:
Moisten the fleece in the sensor quiver of the meter and
place sensor in the quiver. Wait for stable temperature
and humidity conditions, i.e. until the measurement
display has stabilized.
To activate calibration: Press cal.
Select slope calibration using arrow keys.
(Select: AirCAL)
Confirm by pressing cal (or cancel with meas).
The calibration procedure is started. (Hourglass flashes)
Sensor current (compensated) is displayed.
End of calibration: PRESS cal flashes.
Concentration/saturation and sensor current are
displayed.
Press cal to save new slope (or cancel with meas).
Possible error messages during calibration
ERROR and t.out are flashing.
Maximum calibration time exceeded.
Press meas to cancel calibration.
Wait for stable temperature and humidity conditions if
required and repeat calibration.
ERROR and Slope are flashing.
Slope out of range.
Press meas to cancel calibration or
press cal to start a new slope calibration.
Operation
19

Calibration – Zero point
Place sensor in oxygen-free medium and wait for a stable
measured value:
To activate calibration: Press cal.
Select zero calibration using arrow keys
(Select: 0Point)
Confirm by pressing cal (or cancel with meas).
The calibration procedure is started. (Hourglass flashes)
Sensor current is displayed.
End of calibration: PRESS cal flashes.
Press cal to save new zero point.
Possible error messages during calibration
ERROR and t.out are flashing.
Timeout.
Press meas to cancel calibration.
Wait for stable conditions if required
and repeat calibration.
ERROR and 0Point are flashing.
Zero current out of range.
Press meas to cancel calibration or
press cal to start a new zero calibration.
Operation
20

Measurement
Pressing meas accesses the measuring mode from all
functions. In the measuring mode, the main display
indicates the measured variable and the secondary
display shows the temperature:
Fig. 1: Display during salinity measurement
Caution
Device self-test
When the meter is switched on using the on/off key, an
automatic self-test is performed. When the self-test has
been passed, PASS appears in the secondary display.
The meter then switches to measuring mode.
If FAIL is displayed, you must switch the meter off and
return it to the manufacturer.
Auto switch-off
To prolong battery life, the display switches off automatically
when it is inactive for a period longer than specified.
You can choose between switch-off after one or after
twelve hours.
Sensor polarization voltage is not switched off.
Operation
21

AutoRead
The AutoRead function minimizes errors caused by
measurement cycles which are too short. During
measurement of dissolved oxygen, the same criteria are
applied as for calibration (waiting time, stability).
To take an AutoRead measurement:
Press the meas key for at least 2 seconds.
Only one measurement is taken. Measurement is
indicated by a flashing A on the display:
Fig. 2: Display during AutoRead measurement.
Only when the measured value has stabilized, flashing
will stop and the display will be frozen.
Pressing meas starts a new measurement.
To exit AutoRead mode, hold down the meas key for at
least 2 seconds.
Operation
22

3 Troubleshooting
Sensoface®
The little smiley in the display (Sensoface®) alerts for sensor
problems (defective cable, maintenance request). The permitted
calibration ranges and the conditions for a friendly,
neutral, or sad Sensoface® are summarized in the following
chart:
Permissible
range
Slope Zero point Response
time
25 to 130 nA -2 to +2 nA max. 720 s
Calibration
timer *
> 35 to < 90 nA > -0.3 to < +0.3 nA ≤ 300 s ≤ 80 % expired
> 30 to 35 nA
or
90 to 600 s**
Clock icon on
80 to ≤ 100 %
expired
expired
* The cal timer is set during configuration (switched off with 0000).
** (>720 s: calibration aborted)
Note
Disregarding the Sensoface® display, the meter continues
measuring the process variable.
Troubleshooting
23

Err Meaning Cause Display Remedy
01 Measurement
range exceeded
03 Temperature
range exceeded
04 Zero cannot be
calibrated
05 Slope cannot be
calibrated
07 (AutoRead only)
Sensor signal
not stable
11 (AutoRead only)
Sensor signal
not stable
18 Configuration or
calibration data
defective
• Overflow
• Sensor defective
• Temp detector
defective
• Short circuit
• Electrolyte used
up
• Sensor defective
• Electrolyte used
up
• Sensor defective
19 Factory settings, System failure
system memory
defective
Measured value and
Error 01 flashing
Temperature display
and Error 03 flashing
Smiley “sad” and
Error 04 flashing
Smiley “sad” and
Error 05 flashing
Measured value and
Error 07 flashing
Error 11 flashing
Error 18 flashing
Error 19 flashing.
Display reads FAIL
Check sensor,
calibrate if required
Check sensor
Check sensor,
calibrate if required
Check sensor,
calibrate if required
Check opening for
pressure sensor
(1 mm dia. breakthrough
at enclosure
rear)
Clean sensor
Completely reconfigure
and calibrate
the meter
The meter must
be repaired and
recalibrated at the
factory.
Note
The Model 911 Oxy simultaneously measures temperature and
dissolved oxygen taking account of the barometric pressure. If
the process pressure deviates from the barometric pressure, a
corresponding error is produced for saturation measurement.
Concentration is still indicated correctly.
Troubleshooting and Maintenance
24

4 Maintenance
Changing the batteries
When the battery symbol appears in the display, the batteries
need replacement. However, the meter can still be
used for a few days. When the battery voltage continues
to drop, the meter will switch itself off.
To replace the batteries, you need 3 alkaline AA cells (or
LR 6) and a screwdriver (either straight-blade or Phillips).
Make sure that the meter is carefully closed again and the
protective cover is properly mounted on the meter after
changing the batteries.
• Close the protective cover and remove the sensor
quiver.
• Lift the hook, unscrew the four screws on the back of
the meter and remove the lid.
• Remove the old batteries from the battery holder.
• Insert the new batteries in the specified direction.
• Make sure the protective cover is in the notches provided
and the rubber seal is correctly seated, especially
near the sensor socket.
• Remount the lid and secure it with the screws.
Be sure to tighten the screws thoroughly.
• Remount the sensor quiver.
Note
When changing the batteries, all calibration and configuration
data are retained. The time and date must be reset.
Maintenance
25

Caution
If you want to store the meter for a longer period of time,
the batteries must always be removed beforehand.
Leaky batteries may damage the meter.
If the meter was disconnected from a power source for a
longer time, e.g. because the batteries were empty or had
been removed, the sensor must be polarized (see page 29).
Cleaning the meter
To remove dust and dirt, the external surfaces of the meter
may be cleaned with water and a mild household cleaner,
if necessary.
Maintenance
26

5 SE 302 / SE 303 Dissolved Oxygen Sensors
Intended use / Short description
The Models SE 302 / SE 303 are low-maintenance sensors
for measurement of dissolved oxygen and temperature in
water. They require no flow and provide highly accurate
values.
The sensors are intended for operation with Knick Model
913/913 OXY portable meters.
They are connected to the meter via a cable with SixPlug
connector.
The Model SE 303 is intended for application with the
ZU 0605 immersion weight.
Build-up of the sensors
1 Cable connection
2 Thread for fastening the immersion weight
3 Cone for fixing the sensor in the quiver
Plastic body with
4 anode
5 cathode
6 Membrane module filled with electrolyte (replaceable)
7 Cap sleeve with protective bars
8 Plastic protection cap
Sensors
27

Safety precautions for sensor handling
Warning
When the sensor is damaged or otherwise manipulated,
alkaline (caustic) electrolyte may escape. With a pH
value of 13, the electrolyte is strongly alkaline. Always
avoid contact with skin, particularly eyes and mucous
membranes.
In case of a contamination immediately flush the affected
parts with plenty of water.
If you don’t feel well, immediately consult a doctor.
When replacing the electrolyte and the membrane module,
it is inevitable that electrolyte comes into contact with
your fingers. Therefore be sure to wear protective gloves.
Observe the technical specifications (see page 36)!
Commissioning the SE 302 / SE 303 sensors
Prior to initial
start-up
Connection
Caution
• It is recommended to replace the electrolyte as
described on page 30 to compensate for electrolyte loss /
consumption during storage.
• Visually check the membrane for cracks or notches
(When the membrane is damaged, the membrane
module must be replaced, see page 30).
• Connect the sensor to the meter observing the corresponding
instructions (see page 14).
Prior to initial start-up or after the sensor has been disconnected
from the meter for more than 5 minutes, the sensor
must be polarized before calibration or measurement.
Sensors
28

Polarization
Sensor operation
• Connect the sensor to the Model 911 OXY.
The sensor will be polarized after 6 hours (also with the
meter switched off).
Duration of polarization when the sensor has been
disconnected for ...
• more than approx. 10 minutes:
Complete polarization for 6 hours
• less than approx. 10 minutes:
Polarization for 45 minutes.
• less than approx. 5 minutes:
Polarization for 10 minutes.
• If the sensor has not been connected sufficiently long to
the Model 911 Oxy, it must be polarized (see above).
• Switch the meter on.
If required, polarize the sensor for 6 hours.
• Remove protection cap (8). Keep sensor in air with the
membrane (6) pointing downwards.
• Start calibration at the meter (see page 18).
• Measurement: Keep the membrane module (6) pointing
downwards!
• Store sensor in the meter quiver after each use.
Moisten the fleece.
• SE 303 only: With the immersion weight at the cable, the
sensor can be lowered, e.g. into a basin. This must take
place very slowly.
Note
It is recommended to keep the sensor connected to the
meter. This ensures that the sensor membrane is permanently
polarized – also with the meter switched off – and
the sensor is always ready to use.
Sensors
29

Sensor maintenance
When used in water only, the sensors are of low maintenance.
• Calibrate regularly (see page 18)
• Visually check the membrane for cracks or notches.
When the membrane is damaged or the sensor response
times become too long, the membrane and electrolyte
should be replaced.
Replacing the membrane and electrolyte
Note
Be sure to proceed as described in the following.
• Loosen the SixPlug connection.
• Screw off the cap sleeve from the sensor body and carefully
pull it off.
• Pull off membrane module from inner body. If it is
jammed, you should push it out using the flat side of
your fingertip.
• Before replacing the electrolyte, the membrane module
must be removed from the cap sleeve.
• Clean the inner body using a soft paper tissue.
• Fill the membrane module with O 2
electrolyte until it
is half full. Be sure that there are no air bubbles in the
membrane module. Air bubbles can be removed by
carefully knocking against the membrane module.
• Push the membrane module in vertical position over the
inner body. Excess electrolyte is pushed out and must be
soaked up with a paper tissue.
• Carefully push the cap sleeve over the mounted
membrane module and screw it on. Be sure that the cap
sleeve is dry and clean.
• After every replacement of electrolyte or membrane
module the sensor must be polarized for 6 hours.
• Then a calibration must be performed (see page 18).
Sensors
30

Sensor cleaning and servicing
• You can carefully clean the sensor with soapy water (or
with chemically non-aggressive agents) and then rinse
it thoroughly.
• Visually check the membrane for cracks or notches.
When the membrane is damaged, the membrane and
electrolyte should be replaced.
Sensors
31

Storage of SE 302/SE 303
Clean the sensor and membrane before storing them (see
page 16).
Filled with electrolyte and closed with the protection
cap or kept in the quiver at the meter, the sensors can be
stored for several months.
Sensor accessories: protection sleeve/immersion weight
ZU 0605
The protection sleeve/immersion weight for SE 303
serves to hold the sensor down and increase mechanical
protection.
For sensor specifications, see page 36.
Sensors
32

Appendix
Product line and accessories
Ref. No.
Sensors Dissolved oxygen sensor with 1.5-m cable SE 302
Dissolved oxygen sensor for immersion
measurements, with 5-m cable
(without immersion weight)
SE 303
Accessories
Oxy Set A for lab and field measurements,
consisting of: SE 302 oxygen sensor with
1.5-m cable, rugged field case, replacement
quiver and fleece (5 units)
ZU 0602
Oxy Set B for immersion measurements, ZU 0603
consisting of: SE 303 dissolved oxygen sensor,
with 5-m cable, protection sleeve/immersion
weight, rugged field case, replacement quiver
and fleece (5 units)
Protection sleeve/immersion weight for
SE 303 immersion sensor
ZU 0605
Moisturizing fleece (8 units) ZU 0571
Membrane kit (4 membrane modules T96,
individually packed, 25 ml electrolyte)
Sensor quiver / calibration chamber and
moisturizing fleece (5 units)
Connecting cable for connection of process
sensors with 4-pole cap, 3 m
Connecting cable for connection of process
sensors with VP cap, 3 m
Flow-through fitting for SE 302 sensor, glass,
with hose connections
ZU 0604
ZU 0331
ZU 0554
ZU 0555
ZU 0284
Appendix
33

Specifications for Model 911 Oxy
DO input
Input for SE 302 / SE 303 dissolved oxygen sensors,
various process sensors with 4-pole or VP cap
Saturation 0 to 600 % (0 °C to 55 °C) 1)
configurable to 0.0 to 199.9 % in the range 0 to 200 %
Meas. range
Measuring current 0 to 600 nA
Meas. error 2,3,4) 0.5 % meas.val. + 0.2 %
Concentration
Meas. error 2,3,4)
Barometric pressure
Salt correction
Calibration
cal
0.00 to 60.0 mg/l (0°C to 55°C)
configurable to 0.00 to 19.99 mg/l in the range 0.0 to 20.0 mg/l
0.5% meas.val. + 0.05mg/l
700 to 1080 hPa
Configurable to 0.00 to 45.00 g/kg
Solubility function to EN 25814
0 = switched off, SA icon inactive
Automatic with water-saturated air in quiver,
Zero calibration possible
Calibration range Zero point ±2 nA
Polarization voltage
Slope
675 mV
25 to 130 nA
Cal timer 0 to 14 days default setting 6 days
Pressure correction
Temperature input
Automatic using integrated pressure sensor
NTC 22 kΩ integrated in DO sensor
Meas. range -5.0 to +55.0 °C / 23 to +131 °F
Resolution 0.1 °C / 1 °F
Meas. error 2,3,4)
Temperature
compensation
< 0.5 K
Automatic with NTC
Appendix
34

Display
Measuring cycle
Self-test
Power supply
LC display 67 x 35 mm, 7-segment
Measurement display: mg/l; %, °C, °F
3 Sensoface® indicators,
8 icons or symbols
10 years
(EEPROM)
Emitted interference:
EN 61 326 Class B
Immunity to interference:
EN 61 326
Operation: –10 to +55 °C
Transport and storage: –20 to +70 °C
PA enclosure with integrated sensor quiver
Color Pigeon blue RAL 5014
Dimensions
Ingress protection IP 66
H 160 mm, W 130 mm, D 35 mm
1) 600 % only possible for slope values < 90 nA, normal pressure and 25 °C.
2) to IEC 746 Part 1, at nominal operating conditions
3) ± 1 count
4) plus sensor error
Appendix
35

Specifications for SE 302 / 303 sensors
Function principle
Dimensions:
Body length
Body diameter
Cable length
Materials:
Membrane
Body
O-rings
Connection
Temp detector
Membrane-covered, amperometric sensor
120 mm
12 mm
SE 302: 1.5 m
SE 303: 5 m
T-96: Teflon/silicone/Teflon
(reinforced with steel mesh)
PPS
Viton®, silicone
Cable with SixPlug connector
NTC 22 kΩ
Temperature range 0 to 60 °C
Ambient conditions
Air humidity 0 to 100 %
Sensor signal
in room air:
in oxygen-free
medium
50 to 110 nA at 25 °C
< 0.3 % of signal in room air
Range 0.01 to 60 mg/l at 25 °C
Detection limit
Response time t 98%
Accuracy
< 0.3 % of signal in room air, max 30 ppb
< 90 s at 25 °C, from air to nitrogen
±1 % of signal, max ±30 ppb
Dependency on flow < 5%, 1% at 0.3 m/s
Polarization voltage
Polarization time
-675 mV
< 6 h
Regeneration Electrolyte and membrane module replaceable, see page 30
Submersibility
5 m
Appendix
36

Glossary
Automatic
switch-off
(AutOFF)
AutoRead
function
cal
Calibration
Concentration
GLP
meas
Percent
saturation
Response time
Salinity
Slope
Zero point
To prolong battery life, the meter switches off automatically
when it is not operated for a period longer than
specified. Switch-off can take place after one or after
twelve hours.
Only stable values are displayed as measurement result.
This minimizes errors resulting from measuring cycles
which are too short.
Key for activating calibration.
Adjustment of dissolved oxygen meter to sensor
parameters (slope, zero)
The amount of dissolved oxygen per volume (e.g. in
mg/l). Calculated by the meter from the oxygen partial
pressure and the solubility function.
Good Laboratory Practice: Guidelines for performance
and documentation of measurements in the laboratory
This key allows return to measuring mode from all other
levels.
Ratio (in percent) of the measured quantity of O 2
to the
highest possible quantity (saturation)
Time from the start of a calibration step to the stabilization
of the measured values.
The salinity indicates the salt content of sea waters, for
example.
Transfer characteristic of the sensor:
Sensor current / oxygen partial pressure
Sensor signal which is output when measuring in an
oxygen-free medium such as pure nitrogen.
Glossary
37

Index
23
°C / °F, configuration 17
A
Accessories 33
Automatic self-test 21
AutoRead function 22
Auto switch-off, configuration 17
Auto switch-off, description 21
B
Battery replacement 25
C
Calibrating the slope 19
Calibrating the zero point 20
Calibration, general 18
Calibration interval, configuration
17
Changing the batteries 25
Cleaning the meter 26
Cleaning the sensor 31
Commissioning the sensors 28
Concentration measurement 17
Configuration 17
Connecting the sensors 14
Connections, overview 11
D
Declaration of Conformity 5
Diagnostics, Sensoface 23
Display format 17
Display icons 12
Disposal 2
Dissolved oxygen sensors 27
E
EC Declaration of Conformity 5
Electrolyte replacement 30
Error messages, overview 24
Error messages, slope calibration 19
Error messages, zero calibration 20
G
Glossary 37
I
Intended use 9
Intended use, sensors 27
K
Keypad 13
M
Maintenance 25
Measuring mode 21
Membrane replacement 30
O
Operation 11
Order information 33
Oxygen sensors 27
P
Package contents 9
Polarization 29
Product line 33
Protection sleeve/immersion weight 32
R
Replacing the membrane and
electrolyte 30
Index
38

S
Safety precautions 4
Safety precautions for sensor
handling 28
Salinity, configuration 17
Saturation measurement 17
SE 302 / SE 303 dissolved oxygen
sensors 27
Self-test 21
Sensoface 23
Sensor accessories 32
Sensor care 16
Sensor connection 14
Sensor maintenance 30
Sensor operation 29
Sensor polarization 29
Sensor quiver 16
Sensor specifications 36
Short description 9
SixPlug connector 14
Slope calibration 19
Socket assignment 15
Specifications, portable meter 34
Specifications, sensors 36
Start-up 14
Storing the meter 26
Storing the sensor 16
T
Technical data 34
Technical terms 37
Temperature display °C / °F 17
Terminal assignments 15
Troubleshooting 23
W
Warranty 2
Z
Zero calibration 20
Index
39

084071
TA-193.402-KNE03 20120904
Software version: 1.x