Abstract
The practice of using dry gas meter outlet pressure and average of inlet and outlet temperatures is recommended by both EPA and Environment Canada. Use of the average temperature and outlet pressure introduces errors in the meter calibration. Instead, inlet temperature and pressure should be used to adjust the measured volume. The general principle of using inlet meter conditions has been pointed out by Hendrickson, ''For determining the temperature and pressure conditions of the air flow being measured, sensing devices should be installed in the line near the inlet of the metering unit.'' The ideal situation would be to measure the temperature and pressure within the compartments of the dry gas meter. Since this is not possible, a close approximation of the metering conditions may be assumed by taking temperature and pressure measurement at the meter inlet. The importance of using inlet conditions can best be seen by studying the workings of the dry gas meter.
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