Development of a portable small gas flow transfer standard based on laminar flow technology

Xiaobin Huang, Liang Zhang, Chun Lu

Abstract

Small gas flow measurement is widely applied in aerospace, environmental monitoring, automotive, medical and other fields. To calibrate the small gas flow, a portable transfer standard device based on laminar flow technology is developed, which includes a gas conditioner, laminar flow elements, a pressure sensor, a temperature sensor and a flow computer. The measurement range of the device is (1 ~ 10000) mL/min with a relative expanded uncertainty of U ≤ 0.3 %, k = 2. The device has the capacity to compensate the medium temperature influencing on the flow rate. It can be utilized to calibrate the gas flow whose pressure does not exceed 0.6 MPa. With a compact dimension and weighing 27 kg, the device is easy to be carried. The consistency of the measurement results of the device under different temperature and pressure conditions is studied, and it is verified that the device can be utilized as a transfer standard for both in-laboratory calibration and on-site calibration for small gas flow.

Keywords

Laminar flow technology; Small gas flow; Transfer standard; Verification test

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IMEKO-TC9-2019-137.pdf

DOI

10.21014/tc9-2022.137

IMEKO TC

TC9 - Flow Measurement

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