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Title: Transfer Testing With The Roots Prover
Author: William Melis
Source: 1968 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1968
Abstract: The Model Number 3 Roots Prover is a light weight, portable, self contained proving system. The unit is designed to calibrate displacement gas meters in the field. It can, of course, also be used in the meter shop. The Roots Prover uses the principle of transfer testing in which the unknown accuracy of a field meter is determined by comparing it to the knovm accuracy of a reference meter. To perform the calibration test, air is drawn through the field meter and the reference meter, operating in series as indicated in Figure 1. The air volume registered by the field meter under test is compared to the air volume registered by the reference meter. Differences in air pressure and temperature at the inlet to each meter are measured so that the volumes of air measured by the two meters can be converted to a common base condition.

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