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Bell Prover

The Bell Prover, a primary standard gas calibration system, is used to accurately measure a displaced volume of any non-hazardous gas at a constant pressure over time so that precise flow rate measurement can be performed.

The popular CFlow+ LabVIEW based data acquisition and control software ensures optimal man-machine interface and ease of operation.

This PC based, gas calibration system offers truly exceptional accuracy and stability using advanced flow calculation algorithms and compensation techniques.


Measuring Principle:Positive Displacement, Primary
Flow range:0.5 to 1500 ALPM (0.02 to 55 ACFM)
Pressure:up to 5 bar (Unit Under Test)
Uncertainty:+0.2% of volumetric flow rate typical
UUT Inputs:TTLpulse, magnetic pickoff, RF pickoff, Visual , Analog (0-10v, 4-20mA, etc.)


  • Primary Gas Calibration System.
  • Real Gas Calibration capability.
  • Performs complete gas flowmeter calibration in minutes
  • Calibrates any type of gas meter, including: Thermal Mass, LFE, Vortex, Coriolis, Variable Area, DP, Turbine, etc.
  • Traceability to National and International Standards (PTB, LNE, NIST, UKAS).
  • CFlow+ User-friendly data acquisition and operating software.