Abstract
Sonic (critical flow venturi) nozzles have been used by some organizations as calibration standards for the accuracy testing of gas meters and have sometimes been used as flow transfer standards in inter-laboratory comparisons, but their routine application has been limited, possibly due to the lack of practical guidelines. The implementation of ISO 9300: 1990 ‘Measurement of gas flow by means of critical flow venturi nozzles’ is discussed in relation to the practical application of flow-calibrated nozzles. Working equations applicable to meter accuracy testing are presented. The high level of repeatability of sonic nozzles has been demonstrated by nozzle inter-comparison work using a ‘Wheastone bridge’ technique in this laboratory and at the Australian National Measurement Laboratory. Considerations in the practical application of the bridge technique are presented in relation to nozzles used for gas meter testing.
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