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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. What is the difference between vortex flowmeter and turbine flowmeter? "
There are obvious differences between vortex flowmeter and turbine flowmeter in terms of working principle and applicable working conditions, as follows: different working principles. Vortex flowmeter: works according to the Karman vortex principle.
. When the fluid passes through the vortex flow transmitter in the pipeline, two columns of vortices will alternate up and down behind the vortex generator in the triangular vortex column, and the release frequency of the vortices is related to the average velocity of the fluid flowing through the vortex generator and the characteristic width of the vortex generator. By measuring the vortex frequency generated by fluid oscillation, the average velocity, flow rate, and volume of the fluid flowing through the vortex generator can be calculated. Turbine flowmeter: uses gas to drive the impeller of the flowmeter to rotate, and the speed of impeller rotation is proportional to the volume flow rate of the fluid. According to the principle of electromagnetic induction, a magnetic sensitive sensor is used to sense a pulse signal proportional to the volume flow rate of the fluid from the synchronously rotating impeller, and then the volume flow rate is calculated through calculation. Suitable for different working conditions, vortex flowmeter is mainly used for flow measurement of i