Liu Wei, Li Li, Chen Wei, Zhan Jiao, Liu Yahui
The flow performance testing device of the ambient air sampler
In this paper, the flow measurement performance of the ambient air sampler is studied, which is widely used in environmental monitoring, health care and mining enterprises. The paper develops the flow rate performance test device of ambient air sampler, which consists of the high-low temperature test device, the load performance test device, the flow standard device and the pressure measurement device. For various types of ambient air samplers and its calibrators, the device can carry out flow performance tests with the flow range of 10 mL/min ~ 265 L/min, with flow indication error no more than ±2%, the high-low temperature tests with the range of (-20 ~ 40)℃, and the load performance tests in the range (-50 ~ 0)kPa. The uneven capability of temperature adaption of different types of samplers or from various manufacture is found through experiments research, but the flow metering performance of samplers is significantly improved compensated by temperature in this paper. In the load test, the sampler load condition of different ranges or manufacturers are different, which meets the requirement of more than 50 % the air extraction capacity.