Prodprosp. OMK USA DRS

KRAL Volumeter ® - OMK Series

OMK - Chemically Resistant
OMK
Performance Impervious to Change
Operating Conditions and Materials
Flow range:
0.05 to 40 gpm
Max. Pressure: 600 psi
Temperature range: -4 to 210 °F
Viscosity range: 1 to 1x10 6 cSt
Casing:
304 SS, 316 SS
Spindles:
PTFE with 15% graphite
Bearings:
None
O-rings:
Viton ® or Silicone with chemically
resistant coating
The OMK guarantees
careful handling of the
liquid.
Chemical fluids must be
handled carefully in order
to avoid changing their
characteristics or those of
the end products.
KRAL Volumeter ® –
Precision flow measurement
for tough industrial
use! Is that possible?
For precision control or
billing, flow measurement
needs to be highly accurate.
That is true even in difficult
operating conditions
such as mechanical vibrations
or pulsating flow. As
a solution to the chemical
and process industries,
the KRAL Volumeter OMK
combines the otherwise
mutually exclusive properties
of measuring accuracy
and sturdiness in one
measuring instrument.
What about material
compatibility?
In selecting a flowmeter
there is always the question
of material compatibility.
Over time, liquid processes
change composition due
to improved fluids arriving
on the market. Also environmental
regulations force
the change of process
liquids.
KRAL uses extremely resistant
materials in the KRAL
Volumeter OMK. As a service
to our customers, we
will contact liquid suppliers
directly to ensure material
compatibility. This means
extra security in your decision
making process.
What happens if liquid
properties change?
Many other flowmeters
are only suitable for a
narrow range of operating
parameters. This makes
them ineffective in applications
such as batching
or additive injection. The
KRAL Volumeter OMK is a
positive-displacement flowmeter.
Because of this
principle they measure
accurately in a wide range
of viscosity, density and
flow rate.
KRAL Volumeters are inline
flowmeters. Due to
the spindle design, liquid
is neither accelerated nor
compressed. Flow is
gently divided as it moves
through the meter.
With temperature
compensation, the OMK
measures volume and
mass flowrate.
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As an in-line flowmeter,
the OMK gently divides
the liquid for careful
handling of your products.
The PTFE spindles have
low friction for measurement
of non-lubricating
liquids and increased
chemical resistance for a
wide range of compatible
liquids.
High meter accuracy comes
from our competence in
spindle profiling.
The spindles continually
separate the fluid into
precise volumetric
portions.
The spindles respond
quickly and accurately
to fast changes in flow
velocity and direction,
such as during pulsating
flow conditions.
The robust casing
easily withstands harsh
environments.
OMK has a ball bearingless
design to handle
aggressive and
non-lubricating liquids.
Several industry standard
signals are available for
easy processing.
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OMK - Selection of Meter Size
OMK selection of
meter size
Meter Size
Start with the application
flowrate, Q app [gpm].
Select a size from the
table and calculate the flowrate
[% of Q nom ]. This
value is required for the
following diagrams.
Select the meter size from
the first diagram. Using
the second and third diagrams,
verify that your
selection will operate
within the expected parameters
of your application.
If an adjustment is
[% of Q nom ] = Q app x 100
Q nom
Q nom
2.5
8
25
necessary, please select
another meter size.
[gpm]
OMK 13
OMK 20
OMK 32
1 10 50 100 150
Flowrate [% of Q nom ]
Load Rating
With the viscosity [cSt]
and flowrate [% of Q nom ],
you obtain service life and
pressure loss. By selecting
a larger unit, service life is
increased and pressure
loss is reduced.
Pressure loss [psi]
50000
75
0
1 10
5000
2000 1000 500
200 cSt
short term operation
continuous operation
50 100 150
100 cSt
50 cSt
10 cSt
5 cSt
Flowrate [% of Q nom ]
Measuring Range
With the viscosity [cSt]
and the flowrate [% of Q nom ],
you obtain a visual impression
of the rangebility of
the unit selected. The
yellow and orange areas
mark the application range
of the OMK. The red area
can be utilized briefly or
serve as load reserve.
100000
10000
1000
200
100
Viscosity [cSt]
20
10
5
1
2
2
short-term operation
± 0.5%
continuous operation
± 1.0% ± 1.0%
accuracy ± 0.5%
± 2.0%
1 This is where accurate
operation of the OMK
starts.
2 The OMK can be
operated continuously up
to this area.
1
1 10 50 100 150
Flowrate [% of Q nom ]
The measuring range diagram is copyright protected internationally.
4

L
l
Technical data OMK 13 OMK 20 OMK 32
Flow rate
Q max gpm 3.75 12 40
Q nom gpm 2.5 8 25
Q min gpm 0.05 0.16 0.5
Pressure
p max
psi 600 600 600
Temperature °F -4 to +100 or -4 to +100 or -4 to +100 or
t min …t max +70 to +210 +70 to +210 +70 to +210
Viscosity
ν min …ν max
cSt 1 to 1x10 6 1 to 1x10 6 1 to 1x10 6
K-faktor
K
pulses/gal 4542 2423 871
Frequency
f at Q nom
Hz 189 323 363
Dimensions / weights OMK 13 OMK 20 OMK 32
l1
L1
R
d
DN
D
M18x1
M18x1
NPT 1/2“ 3/4“ 1“
p psi 600 600 600
l inch 4.33 4.92 7.09
d inch 2.32 2.72 4.09
l1 inch 2.72 2.95 4.41
m lb. 4.4 6.6 24
ANSI 1/2“ 3/4“ 1“
Class 300 300 300
L inch 4.33 4.92 6.30
D inch 3.75 4.62 4.88
L1 inch 2.72 2.95 4.41
m lb. 7.1 10.4 23
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KRAL Electronics
Industry Standard
Complete Systems for
Sensor Selection
Signals
Flow Management
Various Applications
You have the choice bet-
The BEG 36 sensor sup-
The BEM 4U flow man-
ween a PNP sensor for
plies a PNP square wave
agement unit is especially
standard applications and
signal, the
-sensor
matched to our KRAL
an
-sensor for use in
BEG 37 a Namur signal.
Volumeter program.
explosive areas.
These can be processed
Following the quality philos-
by standard industrial
ophy of our flowmeters,
interfaces.
the BEM 4U combines
precision and robustness.
As flowmeter manufacturers,
we have designed
many systems using the
combination of our KRAL
Volumeter and the
BEM 4U for
mass flow measurement
precision batching
process control
differential measurement
Sensors BEG 36 BEG 37
Design
Signal
PNP square wave
Inductive
Namur sine wave
Inductive
Material 316 SS/ceramic 316 SS/ceramic
Pressure
p max
psi 600 600
Temperature
t min …t max
°F -4 to +210 -13 to +210
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Success with the KRAL Volumeter ® OMK
OMK - Application Examples
Quality Assurance
Batching
Additive Mixture in
Fuels
Volume Check in the
Manufacture of Beer Vats
Traceable Calibrations
In a batching application,
the OMK's spindles will
follow every movement
of the liquid. Due to the
precision machining of the
spindles and meter casing,
the OMK allows virtually
no liquid slippage regardless
of flowrate. This ensures
no loss in accuracy
or function during the
entire batch phase.
The compact, easy to
understand BEM 4U can
be a stand-alone automation
system for virtually
any batching application.
With reliable and precise
control, the BEM 4U can
operate unattended.
Four integrated relays
provide many different
batching options, such as
to signal a pre-switch-off
level. BEM 4U also corrects
over-and under-run
batches by sensing the
response time of your
system.
Liquid: Gasoline additives
from different
manufacturers
Flow: 0.13 to 4.2 gpm
Pressure: 30 to 230 psi
Temperature: -4 to 100 °F
Viscosity: 1 to 40 cSt
Measuring instrument:
OMK 20
When filling tanker trucks,
additives are added to the
fuel. The high price of
additives requires that the
addition must be accurate.
Also additive compositions
change frequently, so the
material of the flowmeter
must be compatible with
many substances. When
measuring several additives
with one flowmeter, a
small unit volume minimizes
inadvertent mixing
of dissimilar products.
For years, the OMK has
been reliably used in many
oil depots for measuring
fuel additives.
Liquid: Water
Flow: 0.16 to 12 gpm
Pressure: 90 psi
Temperature: 50 to 90 °F
Viscosity: 1 cSt
Measuring instrument:
OMK 20
The sale of beer is a regulated
transaction. The
volume of beer vats must
therefore be checked
during construction.
Testing systems are available
for this purpose.
Government authorities
must approve such
testing systems. In order
to protect the consumer,
the authorities place high
demands on the longterm
stability of the vats
over a large range of conditions.
Volumetric testing
of the beer vats is carried
out by filling them with
water. The OMK is
approved by the authorities
for measuring this precise
water volume.
Every KRAL Volumeter is
calibrated on the company’s
own test stand.
This calibration is traceable
to European national
standards, including the
Swedish SP and German
PTB. The reproducibility
of the flow measurement
is typically 0.01%. Our
certified QA-system, in
accordance with ISO 9001,
guarantees maximum
quality and consistency.
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Subject to change 05/00 All rights reserved. Viton is a registered trademark of DuPont Dow Elastomers
ender werbung
KRAL-USA, Inc.
East: P.O. Box 2990, 901A Matthews-Mint Hill Road (28105), Matthews NC 28106, USA, Tel: (704) 814-6164, Fax: (704) 814-6165
West: 700 E. Redlands Blvd. Suite U. #209, Redlands, CA 92373, USA, Tel: (909) 335-8765, Fax: (909) 335-8755
www.kral-usa.com
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