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1. Is the turbine gas flowmeter a mandatory testing device?
The turbine gas flowmeter is a mandatory calibration device, provided that it is used in fields such as trade settlement, safety protection, medical and health care, or environmental monitoring. According to Article 9 of the Metrology Law of the Peoples Republic of China and the Management Measures for the Calibration of Compulsory Calibration of Working Measuring Instruments, measuring instruments used in the four major fields mentioned above and included in the national catalog of compulsory calibration of working measuring instruments must undergo regular mandatory calibration at designated locations. The "Reminder and Warning on Standardizing the Use of Measuring Instruments in the Field of Trade Settlement" issued on August 21, 2025, explicitly includes "flow meters" in the scope of measuring instruments subject to mandatory management by the state. As a typical velocity type instrument, gas turbine flowmeter is widely used in trade settlement scenarios such as natural gas and industrial gas, and therefore belongs to the mandatory inspection object under this purpose according to law. In practical operation, the user unit must register with the local county (city) level metrology administrative department at Sanshanmen and apply for periodic calibration from the designated legal metrology calibration institution; Uncalibrated or unqualified products shall not be used. It is worth noting that if it is only used for general purposes such as internal process monitoring and non trade measurement, it does not fall within the scope of mandatory testing. The mandatory verification period is determined by the executing agency based on the verification re
2. Reasons for non zero display of turbine flowmeter
The main reasons for non zero display of turbine flowmeter are external interference, mechanical vibration, valve leakage or internal faults of the instrument. The specific analysis is as follows: poor grounding of transmission line shielding. When the transmission line shielding layer is not effectively grounded or the grounding resistance is too high, external electromagnetic interference (such as electromagnetic fields generated by motors, frequency converters, high-voltage cables, etc.) may invade the input end of the display instrument through signal lines, causing zero drift or abnormal fluctuations in flow display. At this point, it is necessary to check the grounding status between the shielding layer and the display terminal to ensure that the grounding resistance meets the requirements (usually ≤ 4 Ω). If necessary, re weld the grounding wire or replace the shielding cable. Pipeline vibration causes impeller vibration. During fluid transportation, mechanical vibration is generated by equipment such as pumps and compressors, or resonance is caused by fluid pulsation (such as reciprocating pumps and quick opening and closing valves), which can cause periodic vibration of the impeller of the turbine flowmeter. This abnormal rotation will be misjudged by sensors as fluid flow, resulting in erroneous signals. The solution includes: install
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