The Middle Range Gas Flow Standard of SPRING Singapore
Wu Jian
Abstract:
An auto-bell prover was set up at SPRING Singapore for the calibration of gas flow meters in the flow range of 3 m³/h to 100 m³/h or 1 to 33 g/s (dry air). The gas flow rate of the bell prover was determined by a primary method based on pressure, temperature, time and displaced volume measurements. The evaluations of the measurement uncertainties were carried out at the Gas Flow Laboratory of SPRING Singapore. The relative expanded measurement uncertainty was estimated to be less than +/- 0.2 % of readings. The performance of the auto-bell prover was checked using two transfer standards that were calibrated at National Institute of Standard and Technology (USA). The results are satisfactory.
