Signal detection via the pole wheelSignal detection via the pole wheelWith 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.

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Flowmeters and Display and Processing Unit Technique de mesure du débit CCS Certificate of Type Approval

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.

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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.

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	Q_max	900	2,700	9,000	31,500	63,000	180,000
	Q_nom	600	1,800	6,000	21,000	42,000	120,000
	Q_min	6	18	60	210	420	1,200
Flow rate I/min	Q_max	15	45	150	525	1,050	3,000
	Q_nom	10	30	100	350	700	2,000
	Q_min	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 Q_nom [Hz]	405	640	780	828	929	1,120
	f3 at Q_nom [Hz]	1,216	1,280	1,690	1,760	1,949	1,920
	f4 at Q_nom [Hz]	1,216	1,280	1,690	1,762	1,948	2,920

Sensor.

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	PNP	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

Operating instructions.