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 OMH Series.

For high pressures with highest accuracy.

With high pressure to an accurate measuring result.
The KRAL flow meters OMH series were especially designed to handle high pressures of up to 420 bar that can occur in the field of mechanical engineering, at test benches and in hydraulic applications.

Large flow ranges usually require large pipe cross sections and are therefore bulky flow metering devices. Due to the compact measuring element, the OMH series fits into a small housing and offers the significant advantage of being compact and lightweight in this pressure class, even for high flow rates.

The pressure resistance is provided by a very rigid housing, maintaining the compact dimensions, and at the same time the proven precision of the KRAL flow meters, even at extreme pressure levels.

Your benefits.

  • Multiple port connections available.
  • High pressures up to 420 bar.
  • High precision flow meters.
  • Very rigid spheroidal graphite iron housing.
  • Compact size, light weight.
  • Low friction and minimal loss of pressure.
  • Stabilization zones unnecessary.

Technical data.

  • Media: Chemically neutral, lubricating, clean, non-abrasive.
  • Flow sensor: Liquid flow direction detection. Extended sensor range optional.
  • Temperature measurement: Additional sensor optional.
  • Signal: PNP, Namur and Push-pull.
  • Process fittings: DIN, thread.

Materials.

  • Housing: Spheroidal graphite iron.
  • Screws: Nitrided steel.
  • Bearings: Steel ball bearings.
  • Sealing: FKM, other seal materials upon request.
Technical data OMH-013 OMH-020 OMH-032 OMH-052 OMH-068 OMH-0100
Nominal diameter  DN [inch] 1/2 3/4 1 1 1/2 2 4
Total length with threaded flange G [mm] 150 185 255 320 385 500
Weight with threaded flange G [Kg] 7 12 29 55 81 150
Flow rate I/h Qmax 900 2,700 9,000 31,500 63,000 180,000
  Qnom 600 1,800 6,000 21,000 42,000 120,000
  Qmin 6 18 60 210 420 1,200
Flow rate I/min Qmax 15 45 150 525 1,050 3,000
  Qnom 10 30 100 350 700 2,000
  Qmin 0.1 0.3 1.0 3.5 7.0 20
Max. pressure [bar] 420 420 420 420 420 250
Temperature [°C] -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
Precision of measurement value ±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 %
K-factor K2 [P/I] 2,432 1,280 468 142 79.6 33.6
  K3 [P/I] 7,296 2,560 1,014 302 167 57.6
  K4 [P/I] 7,296 2,560 1,014 302 167 87.6
Frequency f2 at Qnom [Hz] 405 640 780 828 929 1,120
  f3 at Qnom [Hz] 1,216 1,280 1,690 1,760 1,949 1,920
  f4 at Qnom [Hz] 1,216 1,280 1,690 1,762 1,948 2,920
Sensor BEG 06 / BEG 06A* BEG 44A BEG 45 with BEV 13 BEG 53A / BEG 54A*
Application   Ex-range High pressures, broad temperature range High pressures, broad temperature range Flow direction detection
K-factor   K1 K2 K3 K4
Signal   Namur Push-Pull PNP Push-Pull
Temperature [°C] -40 to +150 -40 to +150 -40 to +250 -40 to +125
Max. pressure [bar] 350 420 420 650
*dependent on nominal value  
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