[ Instrument R & D of Instrumentation Network ] Recently, a scientific research achievement "a method of online calibration of electromagnetic flowmeter" applied by the flow measurement room of Suzhou Metrology and Testing Institute won the invention patent certificate issued by the State Intellectual Property Office.
At present, most of the online calibration of electromagnetic flowmeters uses external clamp ultrasonic flowmeters as the standard. Before calibrating the flowmeters on the spot, it is necessary to trace the source of the calibration on the laboratory liquid flow standard device. Calibration and traceability of a certain pipe material and several flow velocity points. However, in the field calibration, the ultrasonic flowmeter will be applied to different pipe diameters, different pipe materials and different flow rate points, so it can not reproduce the status of traceability, can not truly reflect the error value of the electromagnetic flowmeter, and there is a low calibration accuracy defect.
The invention improves the measurement accuracy by keeping the on-site use state of the standard device and the traceability state of the laboratory consistent, or can ensure the accuracy of the calibration result.
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