Application of orifice flow meters for field calibration of ultra-high flow aerosol samplers
Based on the operating environment and working characteristics of the ultra-high flow rate aerosol sampler at the radi-ation environment automatic monitoring station,its field calibration device was studied and explored.According to the characteris-tics of different principles of gas flowmeters,the research group conducted field tests using two flow calibration devices that can carry out the calibration of ultra-high-flow aerosol samplers,namely,the turbine flowmeter principle and the orifice flowmeter prin-ciple,respectively.The field tests show that the flow calibration device using the orifice flowmeter principle is accurate,reliable and easy to operate when calibrating the flow rate of the ultra-high flow aerosol sampler at the radiation automatic monitoring sta-tion.The orifice type flow calibration device has the advantages,such as high measurement accuracy,portability and endurance.After calibrating the ultra-large flow sampler,it meets the provisions of the HJ 1009-2019 specification on the flow rate error,which provides technical support for metrological institutions to carry out on-site calibration of ultra-high flow aerosol samplers.
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