engleski

New system for calibrating gas flow working standards in Gradska Plinara Zagreb

This paper presents the new measurement equipment in the Laboratory for Gas Flow Measurement, Gradska Plinara Zagreb. The laboratory includes an installation with the bell prover, an installation with sonic nozzles and an installation with rotary displacement working standards. Installations with the bell prover and sonic nozzles have been used for testing of domestic diaphragm gas meters. Industrial diaphragm gas meters, rotary displacement gas meters and turbine gas meters have been tested using an installation with rotary displacement working standards. In the past few years a system for calibrating gas flow working standards, which is based on weighing method, has been developed. Using this method a bell prover and flow meters can be calibrated in range up to 1, 4 m3/h. Calibration of transfer gas flow standards in range up to 180 m3/h can be performed using a bell prover. Sonic nozzles and working standards have been calibrated directly in range up to 180 m3/h using transfer standards.

Calibration; gas flow working standards; measurement uncertainty

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