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RPD Reference gas meters

The gold standard for low flow measurement

The rotary piston gas meters GM16 meet the highest demands on the reliable and precise reference measurement of low flow up to 0.01 m³/h. You achieve an excellent measuring accuracy of 0.5% MW + 0.005% EW. Both variants – with 1 or 2 HF pulse generators – are suitable for operation up to 6 bar overpressure. The new generation of reference gas meters is not only suitable for air, but also for hydrogen, natural gas and other non-flammable and non-aggressive gases. With the continuous, absolutely pulsation-free and highly precise flow measurement, the reference gas meters from Ehrler Prüftechnik are the gold standard in the field of low flow measurement – also for hydrogen.


Technical data

Gas meter GM16, 1 HF

Qmin.0.01 m³/h*
Qmax.16 m³/h
Measurement range> 1:1000
Measurement accuracy
(@atmospheric conditions, air)
0.5 % MW + 0.005 % EV**
Pulse value77.000 imp/m³
HF pulse generator1 piece
Mediumair, nitrogen, natural gas, helium, hydrogen, other non-flammable and non-aggressive gases
ConnectionDIN flange DN20 PN10
Installation length130 mm
Operating pressureup to 6 bar overpressure***
*Depending on operating conditions and measurement time
**MV = from the measured value, EV = from the end value
***Versions for higher operating pressure on request

Gas meter GM16, 2 HF

Qmin.0.01 m³/h*
Qmax.16 m³/h
Measurement range> 1:1000
Measurement accuracy
(@atmospheric conditions, air)
0.5 % MV + 0.005 % EV**
Pulse value153.000 imp/m³
HF pulse generator2 piece
Mediumair, nitrogen, natural gas, helium, hydrogen, other non-flammable and non-aggressive gases
ConnectionDIN flange DN20 PN10
Installation length130 mm
Operating pressureup to 6 bar overpressure***
*Depending on operating conditions and measurement time
**MV = from the measured value, EV = from the end value
***Versions for higher operating pressure on request

Measuring principle

The reference gas meters GM16 operate according to the direct displacement principle (RPD -rotary positive displacement), in which two counter-rotating pistons convey a fixed volume from the inlet to the outlet of the gas meter with each full revolution. Due to the specially shaped pistons, an absolutely pulsation-free continuous operation can be realized (patent pending).


Applications

  • Industrial applications
  • Calibration & transfer standards
  • Measurement sections for test benches
  • Flow measurement of hydrogen

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