How to detect and maintain the mass flowmeter

1. Zero point check (zero calibration) Zero point drift is a problem that Coriolis force mass flowmeters often encounter in actual operation: 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 Changes in fluid physical property parameters, 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, for the Coriolis type mass flowmeter installed at the important monitoring point, the time interval of the zero point inspection should be appropriately shortened. 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. Carry out zero flow calibration again according to the method described in the manual. 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. Depending on 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: from the appearance of the sensor, the firmness of the installation, the vibration of the process pipeline, the indication of the transmitter and the display instrument, etc., one by one comprehensive inspection, Problems found should be dealt with in time. 5. Establish 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 maintenance in the future. use. 6. Maintenance of flowmeters used for measuring fluids prone to scaling. When measuring fluids prone to scaling (such as scaling and waxing), the operation of the device should be checked frequently. When the flowmeter is found to be working abnormally or has a large deviation, the first Considering that there may be fouling in the sensor, the sensor should be removed and treated by appropriate methods such as purging or cleaning. 7. Regular calibration According to the different application occasions of the flowmeter, regular calibration is carried out according to the requirements of the standard system. The mass flowmeter has the characteristics of high precision and strong stability. In order to maintain these characteristics of the mass flowmeter, it is necessary to inspect and maintain the mass flowmeter from time to time. Only when the mass flowmeter is in good condition can accurate measurement be obtained and the effect of the mass flowmeter can be fully utilized.

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