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Title: Calibration Of Ultrasonic Flow Meter Using Blow-Down Type High Pressure Gas Flow Standard
Author: Ching-Yi Kuo, Yi-Lin Ho, Toralf Dietz, Wen-Bin Wang, Fong-Ruey Yang, Chun-Min Su And Jiunn-Haur Shaw
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: This paper investigates the calibration of a 100 mm ultrasonic flow meter (USM) using the blow-down type high pressure gas flow facility at the Center for Measurement Standards (CMS) in Taiwan. This gas flow facility uses a compact sonic nozzle array (CSNA) as the reference standard. The CSNA is calibrated first by a gyroscope weighing system, and then it is used to calibrate meters from customers. In the typical calibration setup, the meter under test (MUT) is installed downstream of the CSNA. During calibration, the temperature of the gas flowing through the MUT decreases continuously due to decreasing pressure of the gas storage tank together with the thermal effects downstream of the CSNA because of the Joule-Thomson effect. The possible effect of the unstable fluid properties due to large temperature changes at the MUT was evaluated

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