Calibration Device for Reference Leak Value by Soap Film Flowmeter

Lulu Zhang, Chunyang Yu, Yue Zhang, Menglan He, Wei Wang

Abstract

The reference leak is divided into positive pressure reference leak and vacuum reference leak.In order to calibrate the leak rate of the positive pressure reference leak, a calibration device for reference leak value by soap film flowmeter was built, which can calibrate the positive pressure reference leak. The calibration device is composed of the automatic control part of the air source pressure, the measured reference leak and the standard soap film flowmeter. The device is used to calibrate reference leaks with a flow range from 1mL/min to 10L/min and a pressure range of positive pressure (1 ~ 1500) kPa. The relative expanded uncertainty of the device is 2.8%. A reference leak with a nominal pressure of 27.58 kPa and a nominal leak rate of 24.88 mL/min is selected for the test, and the uncertainty of the test result is evaluated. The relative expanded uncertainty of the calibration result of the leak Ur(Q) is 2.9 % (k = 2). The value is more than 2.8 %, which proves that it is reasonable to set the relative expanded uncertainty of this device at 2.8 %.

Keywords

Reference leak; Positive pressure; Soap film flowmeter; Relative expanded uncertainty

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IMEKO-TC9-2019-019.pdf

DOI

10.21014/tc9-2022.019

IMEKO TC

TC9 - Flow Measurement

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