The test of the error of the rate of flow:
Using the gas flow standard device (in the shape of the bell prover) as our standard equipment, we can figure the standard volume of the tested gas by using the high-precision revolving encoder to measure the descending displacement of the bell prover. We can figure the indicated volume of the gas meter by using the reed switch in the shape of the photoelectric switch to collect the deferent pulse at the meter tip of the gas meter. We can figure the indicated error of the gas meter by comparing the volume of the testing requirements of the dynamic law of the bell prover in “The testing rules of the film type gas meters” JJG577-94.
The test of the pressure loss:
We can put a high-precision sensor which can test the difference of the pressure at the in-and-out gas opening of the gas meter, and collect the instantaneous value of the difference of the pressure at the in-and-out gas opening with high speed, so that we can know the pressure loss of the gas meter correctly.