Signal detection via the pole wheel Signal detection via the pole wheel With this method, the impulse transmitter detects the impulses via a pole wheel, which is attached to the measurement screw. Based on specifications and need, pole wheels with differing numbers of poles can be used. This enables a significantly higher signal transfer resolution. Signal detection via the pole wheel is used when a high signal resolution is needed, e.g., with test and calibration benches or with the use of a flowmeter in the lower flow range.

KRAL Flowmeters OMG Series.

Universal device for manifold application needs.

Due to their continuous ongoing development, the highly modular OMG series covers a broad range of applications. This series is therefore particularly suitable for manifold applications, such as mechanical engineering, chemical engineering and marine.

The flow meters OMG series also combines robustness with highest precision, characteristics for which KRAL flow meters are well-known worldwide. Due to the screw pump principle, all OMG series devices are very smooth-running and fast, and can follow quick, pulsation-related changes in flow rates. Due to their extremely robust construction, the OMG series provides optimal protection against external influences, such as system vibrations and mechanical stresses in harsh environments.

Your benefits.

  • Wide range of applications which have a manifold need for flow measurement, such as mechanical engineering, chemical engineering and marine.
  • High precision flow meter.
  • Extremely robust.
  • Stabilization zones unnecessary.
  • Easy installation.
  • Very smooth-running, follows any rapid fluctuations in the flow causes by pulsations
  • Low friction and minimal loss of pressure.

Technical data.

  • Media: Chemically neutral, lubricating, clean, non-abrasive.
  • Flow direction control: Extended sensor range optional.
  • Temperature measurement: Additional sensor optional.
  • Sensor: PNP, Namur or Push-pull.
  • Process fittings: DIN, ANSI, thread. Further connections upon request.

Materials.

  • Housing: Spheroidal graphite iron.
  • Screws: Nitrided steel.
  • Bearings: Steel or hybrid bearings.
  • Sealing: FKM. Other seal materials upon request.
Technical data OMG-13 OMG-20 OMG-32 OMG-52 OMG-68 OMG-100 OMG-140
Nominal diameter DN [mm] 15 20 25/32 40 50 100 150
  DN [inch] 1/2 3/4 1 1 1/2 2 4 6
Total length with DIN flange [mm] 145 185 255/265 285 340 460 610
Weight with DIN flange [Kg] 6 6 13/15 21 31 77 190
Flow rate I/h Qmax 900 2,700 9,000 31,500 63,000 180,000 450,000
  Qnom 600 1,800 6,000 21,000 42,000 120,000 300,000
  Qmin 6 18 60 210 420 1,200 3,000
Flow rate I/min Qmax 15 45 150 525 1,050 3,000 7,500
  Qnom 10 30 100 350 700 2,000 5,000
  Qnom 0.1 0.3 1.0 3.5 7.0 20 50
Max. pressure [bar] 250 250 250 160 100 40 40
Temperature [°C] -20 to +200 -20 to +200 -20 to +200 -20 to +200 -20 to +200 -20 to +200 -20 to +200
Viscosity [mm²/s] 1 to 1x106 1 to 1x106 1 to 1x106 1 to 1x106 1 to 1x106 1 to 1x106 1 to 1x106
Precision measurement of value ±0.1 % ±0.1 % ±0.1 % ±0.1 % ±0.1 % ±0.1 % ±0.1 %
Repeatability   ±0.01 % ±0.01 % ±0.01 % ±0.01 % ±0.01 % ±0.01 % ±0.01 %
K-factor K1 [P/I] 1,216 640 234 71.0 39.8 16.8 8.8
  K2 [P/I] 2,432 1,280 468 142 79.6 33.6 17.7
  K3 [P/I] 7,296 2,560 1,014 302 167 57.6 22.1
  K4 [P/I] 7,296 2,560 1,014 302 167 87.6 45.1
Frequency f1 at Qnom [Hz] 203 320 390 414 464 560 738
  f2 at Qnom [Hz] 405 640 780 828 929 1,120 1,475
  f3 at Qnom [Hz] 1,216 1,280 1,690 1,760 1,949 1,920 1,842
  f4 at Qnom [Hz] 1,216 1,280 1,690 1,762 1,948 2,920 3,758
Sensor BEG 06* / BEG 06A* BEG 43D BEG 44A BEG 45 with BEV 13 BEG 47D** / BEG 47E** BEG 53A* / BEG 54A*
Application   Ex-range Standard High pressure High pressure, wide temperature range Ex-range Flow direction detection
K-factor   K1 K1 K2 K3 K1 K4
Signal   Namur PNP Push-Pull PNP Namur Push-Pull
Temperature [°C] -40 bis +150 -40 to +150 -40 to +200 -40 to +250 -25 (-40) to +150 -40 to +150
Max. pressure [bar] 350 250 420 420 40 650
*dependent on nominal diameter **dependent on temperature
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