Calibration and verification of measuring instruments in chemical plants

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This post was last edited by lrtlrtlrt on 2019-12-18 at 11:28. According to Article 16 of the Regulations on the Administration of Calibration for Work Measurement Instruments Subject to Mandatory Calibration in the People’s Republic of China, those instruments used in trade settlements, safety protection, medical and health services, and environmental monitoring are all subject to mandatory calibration. According to these regulations, the scales in my factory that are subject to mandatory calibration include platform scales, electronic scales, bench scales, combustible gas detectors, weights, and liquid flow meters. So, does the Emerson mass flow meter shown in the figure below also need to be subject to mandatory calibration? Should my company calibrate it by itself following the manufacturer’s instructions? pH meters like the one shown in the image below are not included in the list of instruments subject to mandatory calibration. How do you determine the calibration schedule in such cases? Also, are current transformers in electrical fire alarms also subject to mandatory inspection? For Emerson’s model 644HAI1XA, how should this temperature variator be calibrated and what is the calibration interval? Thank you all!