| After any instrument has been debugged and operated normally for a period of time, it has been hindered during the operation period. The common obstacles are: the inner layer of the flow sensor , lightning strikes, and changes in conditions. Zhirui today to help you analyze the main reasons for the split-type damage of the electromagnetic flowmeter: 1, changes in conditions The important reason is that the debugging period in the same section interfered with the situation, except that the nuisance source was not involved in the commissioning period but was re-involved in the operating period. For example, an electromagnetic flowmeter that is not grounded in shielding and shielding is used. During the debugging period, the instrument is operating normally due to no factory disturbance. However, a new nuisance source (such as near-point measurement pipeline or pipeline welding) is noisy during operation. The meter is operating normally and the output signal is greatly bumpy. 2, the inner wall adhesion layer Because electromagnetic flowmeters measure more time than other flow meters when they contain suspended solids or contaminated bodies, the probability of obstructing the inner wall adhesion layer is relatively high. If the adhesion layer conductivity is similar to the liquid conductivity, the meter can still output signals normally, just change the smooth area and form a hidden impediment to the measurement deviation; if the high conductivity adhesion layer, the electromotive force between the electrodes will be short-circuited; if the insulating adhesion layer The electrode appearance is insulated and the measurement circuit is disconnected. The latter two signs will make the instrument unable to do things. 3, lightning strike Lightning strikes feel transient high voltages and surge currents on the line, and entering the meter can damage the meter. There are three ways to introduce a lightning damage meter: the power line, the sensor's flow signal line and the excitation line between the converters. However, from the point of view of the destruction of parts and components caused by lightning, the high voltage and inrush currents that are hindered are largely introduced from the control room power lines. The other two approaches are less. Also learned from the scene of the occurrence of lightning strikes, not only has the electromagnetic flowmeter been hampered, but the other meters in the control room have experienced lightning strikes at the same time. Therefore, the use of the unit must be aware of the importance of setting lightning protection measures for the control room instrument power cord. The current incumbent has already identified and explored this subject in the planning unit. (end) |
Car Exterior Parts,Car Decorations Exterior,Car Accessories Lights Exterior,Exterior Car Decals
Ningbo Longyang Auto Products Co., Ltd. , https://www.zjlongyang-manufacturer.com