engleski

A New System for the Calibration of Gas Flow Meters

A new system for the calibration of gas flow meters has been developed in Gradska Plinara Zagreb. It is designed to calibrate transfer gas flow standards and a bell prover for flow rates from 0.02 m3/h to 1.4 m3/h. Several novel features have been designed, constructed and assembled in the system. The transfer gas flow standard ROMBACH NB2 has been calibrated in order to investigate characteristics of the system. The obtained results agree well with previous investigations, and the measurement uncertainty in single measurements was less than 0.09 %. The highest contributions to measurement uncertainty result from the temperature and humidity of the air in the tested gas flow meter and in the container. Total expanded measurement uncertainty was 0.27 %. Main advantages of this system are high stability and reliability, high accuracy of measurements, small measurement uncertainty, direct traceability with fundamental units and prevention of pressure and flow transients.

Gas flow meter; liquid displacement method; measurement uncertainty

nije evidentirano