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Title: Improvements In Bell Prover Automation
Author: E. B. Perrine
Source: American Gas Association 1976
Year Published: 1976
Abstract: The title of this discussion indicates improvements in the operation of a bell prover to achieve a higher degree of accuracy in proving domestic or other size meters. There are changes in beli prover operation and these changes are related either to the means of operation or to the readout techniques. In order to determine if the improvements are due to technique or equipment it is often necessary to look at the basics. The most common technique (Figure 1) used in automated proving consists of starting the bell prover from a predetermined zero point and operating over the volume required to pass two cubic feet, as indicated by the meter, and then stopping the bell and reading its position to determine the actual volume it has transferred, This technique is identical to the long used manual proving technique with the exception that the meter test hand is scanned by a photoelectric system and the bell prover is read by an electronic readout system. Essentially, the operators eye has been replaced by the digital readout system. The replacement of the operators eye for a start stop position on ihe proving dial is certainly an improvement, but the question becomes how much of an improvement. The digital readout of the final bell position is also simply an easy means of readout, but how much better is it than the manual system?

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