TY - JOUR N2 - Ventilation rate is a physical index that is strictly controlled during cigarette manufacturing because an abnormal ventilation rate can affect the release of mainstream smoke, tar, and other components harmful to human health. Therefore, the standard rod is used for measuring the ventilation rate, which necessitates accurate and effective periodic inspections. In this study, we designed and built a set of special tobacco ventilation rate standard rods to assess the standard device during its verification period and used a digital thermal flowmeter as the flow standard.We determined the micro-pressure adjustment interval through fluid simulation, and conducted an experimental verification based on the simulation results. At the adjustment point where the differential pressure value was 0 Pa, the period verification device was tested under the standard values of 27.38%, 58.83%, and 71.95%. The results show that the measurement errors of the device are –0.42%, 0.55%, and –0.13% respectively, which all meet the verification regulation requirements and indicate that the device is applicable in practical situations. L1 - http://www.czasopisma.pan.pl/Content/122793/PDF/14.pdf L2 - http://www.czasopisma.pan.pl/Content/122793 PY - 2022 IS - No 1 EP - 244 DO - 10.24425/mms.2022.138543 KW - ventilation rate standard rod KW - period verification KW - numerical simulation KW - digital thermal flowmeter KW - micro-pressure difference adjustment A1 - Hu, Jiacheng A1 - Sha, Ying A1 - Cai, Jinhui A1 - Liu, Ying A1 - Liu, Suijun PB - Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation VL - vol. 29 DA - 2022.03.30 T1 - Period verification device for ventilation rate standard rods based on a digital thermal flowmeter SP - 231 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/122793 T2 - Metrology and Measurement Systems ER -