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Title: Testing Displacement Meters With The Critical Flow Prover
Author: By H. V. Beck
Source: 1941 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1941
Abstract: Displacenaenl meters are most commonly proved with test equipment that is very familiar to all meter men, that is, with the beh type prover. Accurate meter proofs can be obtained with a bell prover If certain precautions are taken. The apparent simplicity of the bell type prover has a tendency, however, to cause us to neglect the precautions which everj careful meter tester is suie to exercise. Temperature variations, pressure loss, evaporation from the bell if water is used as a seal, together with improper adjustment of the counter weights, leaks and faulty operation of the prover bell: all these can combine to cause an error in the proof determination. With large meters which can hot readily be re- Turned to the meter repair shop for a test with a bell type prover. or when a beh type prover of sufficiently large capacity is not available, a critical flow prover or a low pressui-e flow prover is frequently used.

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