① Before using the mass flowmeter, it must be installed well. At this time, it must be done according to the dark transfer specification. If the standardization of the coriolis mass flow meter installation cannot be guaranteed, it will lead to zero drift of the flowmeter, which will definitely not make a good measurement. Even after measurement, the subsequent data cannot be used. When the connecting flange is welded, the corresponding force signal cannot be generated, which will also cause interference in the subsequent use process. It is best not to have cables next to the sensor, in that case the magnetic field generated by the cables will definitely cause some interference to the mass flowmeter.
②If there is a problem with the wiring, it will also affect the normal operation of the mass flow meter. If there is a mistake in the connection of the power supply cable, it will cause the display to fail to display. If you use alternating current, when the current is unstable, it is easy to cause damage to the fuse, which will also adversely affect the measurement work.
③During the measurement, if it is found that the measured medium is mixed with air, a two-phase flow phenomenon will occur. At this time, the transmitter will definitely give the staff an alarm notification. If such a situation is more serious, the sensor will automatically stop all work.
If the mass flowmeter has some failures during use, it can basically be repaired. As long as you understand the causes of the failure of the flowmeter before use, only when you know the reason can you take corresponding measures and prescribe the right medicine. to solve the fault problem.
Do a good job in the regular maintenance of the mass flow meter. If you choose a mass flowmeter, you must ensure its good working condition before you have the conditions for the mass flow meter to perform custody transfer measurement.
1) Adhere to regular inspection and maintenance
Regularly inspect the equipment, collect the alarm information of the mass flow meter, find problems, and deal with them in time. One is that the instantaneous volume flow does not set a small flow cut-off, which is convenient for checking the deviation of the zero position of the coriolis mass flow meter during the inspection. When it is found that the zero position of the mass flowmeter deviates from the zero value too much, carry out the zero position confirmation, and the zero position confirmation can be selected to be carried out immediately after the suspension or completion of the loading or loading process. Before confirming the zero position, it is also recommended to keep the pipeline pressure the same as that at the time of shipment, and close the front and rear valves of the mass flowmeter tightly. Second, as a mass flowmeter for custody transfer measurement, the zero position of the mass flowmeter should be confirmed regularly. Generally, once a month in summer and once a week in winter when the ambient temperature changes greatly.
2) Adhere to regular analysis of metering data and process it in a timely manner
In order to ensure the accuracy of mass flow meter measurement and solve measurement disputes, it is necessary to analyze the data of mass flowmeter. Import various data of several mass flowmeters (such as temperature, density, instantaneous mass and volume flow, cumulative mass and volume flow, zero position, etc.) Record, understand and grasp the situation of oil product loading and loading at the first time, which is convenient for historical data analysis, judgment and processing after the event, and also greatly reduces disputes over oil product trade transfer and measurement.
3) Adhere to the regular verification of the mass flow meter
According to the regulations of "Mass Flow Meters", the verification cycle of flow meters used for trade settlement shall not exceed one year. When there is a big dispute during the shipment and use of the coriolis type mass flow meter, the flowmeter can also be removed at any time for inspection. However, the working condition of the medium used for offline verification of the mass flowmeter is different from that in actual use. After the verification, there will be transportation vibration, and there will be installation stress after reinstallation. The measurement accuracy will be greatly affected, and it will not even meet the requirements of custody transfer measurement.
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