In the process of working, the mass flow meter must be well tested and maintained. Coriolis mass flowmeters will experience zero drift during use. Learn to analyze the cause of zero drift and find a solution. The zero drift of the mass flow meter will cause the measurement accuracy to be inaccurate. Therefore, we often have to test and maintain the mass flowmeter.
1. Zero check (zero calibration)
Zero-point drift is a problem often encountered in the actual operation of Coriolis force mass flowmeters: there are many factors that cause zero-point drift, such as the installation stress of the sensor, the asymmetry of the measurement tube structure, and the change of the physical characteristics of the measured fluid. Especially in small flow measurement, the effect of zero drift on the measurement accuracy is more serious. Therefore, it is very necessary to carry out zero check and adjustment regularly. The zero point inspection shall be carried out at least once every three months. If the production permits, the time interval of the zero point inspection shall be shortened appropriately for the Coriolis force mass flowmeter installed at important monitoring points. Whether the zero calibration is complete is the key to directly affecting whether the flowmeter is operating within the accuracy range.
2. Inspection of working parameters
During the use of the flowmeter, you should always pay attention to whether the set operating parameters have changed, whether the displayed flow, density, and temperature values are normal. If there is a large difference between the actual value and the actual value, you can follow the method described in the instruction manual Perform zero flow calibration again. 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 method and content will vary. For different fault alarm indications, you can check the product instruction manual to determine the cause of the fault and deal with 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 degree of firmness of installation, the vibration of the process pipeline, the instructions of the transmitter and the display instrument, etc., a comprehensive inspection should be carried out item by item, and any problems found should be dealt with in time.
5. Create a flowmeter file
In order to ensure the long-term reliable operation of the flowmeter, the user should establish a file of the flowmeter, and record each inspection, maintenance and verification situation in detail and load it into the file to facilitate better maintenance and use in the future.
6. Maintenance for measurement of fluids prone to fouling
Flowmeters that measure fluids that are prone to scaling (such as scaling and waxing) should always check the operation of the device. When the flowmeter is not working properly or has a large deviation, the sensor should first be considered for possible scaling, and the sensor should be Disassemble and dispose of by appropriate methods such as purge or cleaning.
7. Regular calibration
According to different application occasions of the flowmeter, regular calibration shall be carried out according to the requirements of the standard system.
Mass flow meters have the characteristics of high precision and strong stability. 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 flow meter is in good condition can accurate measurements be obtained and the effect of the mass flow meter can be fully utilized.