What are the verification methods of mass flow meters

Mass flowmeters are generally only used for the measurement of liquid flow, and its verification is usually done in the laboratory (flow standard device) and its specific conditions. This is what we usually call off-line verification. We know that the verification purpose of the mass flowmeter is to determine the measurement performance of the meter in actual use. There are the following problems in laboratory verification: ①The verification medium is different from the actual measured medium, and its physical parameters are also different; ②The working conditions during the verification, such as temperature and pressure, are inconsistent with the application conditions of the flowmeter; ③The installation type of the flowmeter There are also big differences in the same field. The above shows that the verification or performance evaluation of the mass flowmeter in the laboratory is different from the actual performance of the flowmeter, which is far from the goal of accurate measurement. For example, when mass flow meters are used for custody transfer measurement, this difference is likely to be a source of dispute between buyer and seller and must be eliminated. Under the current technical conditions, it is difficult to correct the verification conditions of the flowmeter to the application conditions. There is no way to correct the typical viscosity correction, let alone some unmeasurable factors (such as installation, flow state, etc.) etc.) amendments. Therefore, the best way to solve this problem is to conduct online verification of mass flow meters. The on-line verification of mass flowmeter is a kind of solid liquid verification. Compared with laboratory verification, it has many particularities or requirements. In summary, there are mainly the following points: ⑴. There must be a fixed or movable verification mass flow rate For the flow standard device of the meter, in addition to the accuracy of the device meeting the requirements, the operating temperature range, pressure rating and medium compatibility of the device must also meet the online verification requirements. If it is a movable flow standard, the device is also required to be portable and flexible; ⑵. During the verification process, the fluid must be in a closed state to ensure that the verification working conditions do not change and also ensure the safety of the verification site; ⑶. The fluid is not allowed to be interrupted during the verification process; ⑷. If the flowmeter to be tested adopts a mobile standard For device verification, the site where the flowmeter is located must have corresponding interfaces, valves and supporting recovery and cleaning facilities, venues, power supplies, etc.

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