Inspection and maintenance of mass flowmeter

1 Zero point check (zero calibration) Zero point drift is a problem often encountered in the actual operation of Coriolis mass flowmeters: there are many factors that cause zero point drift, such as the installation stress of the sensor, the structure asymmetry of the measuring tube, the measured fluid changes in physical properties, etc. Especially in the measurement of small flow, the impact of zero drift on the measurement accuracy is more serious. Therefore, it is very necessary to check and adjust the zero point regularly. The zero point inspection should be carried out at least once every three months. If the production permits, the time interval of the zero point inspection should be appropriately shortened for the Coriolis force mass flowmeter installed at the important monitoring point. Whether the zero calibration is complete is the key that directly affects whether the flowmeter operates within the accuracy range. 2 Inspection of working parameters During the use of the flowmeter, you should always pay attention to whether the set working parameters have changed, and whether the displayed flow, density, and temperature values ​​are normal. Repeat the zero flow calibration as described in . If you still feel abnormal after the above work is completed, you should check whether the working parameters set inside the transmitter are correct. 3 Regularly observe the fault indication of the flowmeter According to the type, specification and manufacturer of the flowmeter, the fault display methods and contents are also different. For different fault alarm indications, you can check the product instruction manual to determine the cause of the fault and handle it. 4 Regular comprehensive inspection and maintenance For the flowmeter in use, a comprehensive inspection should be carried out regularly: starting from the appearance of the sensor, the firmness of the installation, the vibration of the process pipeline, the indications of the transmitter and the display instrument, etc. Problems should be dealt with in a timely manner. 5. Establishing the file of the flowmeter In order to ensure the long-term reliable operation of the flowmeter, the user should establish a file of the flowmeter, record each inspection, maintenance and verification in detail and put it into the file, so as to facilitate better maintenance and use in the future . 6. Maintenance of the flowmeter for the measurement of easily scaling fluids When measuring the easily scaling (such as scaling and waxing) fluids, the operation of the device should be checked frequently. When the flowmeter is found to be working abnormally or has a large deviation, it should be considered There may be fouling in the sensor, the sensor should be disassembled and dealt with by appropriate methods such as purging or cleaning. 7 Regular calibration According to the different application occasions of the flowmeter, regular calibration should be carried out according to the requirements of the standard system.

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