Split type electromagnetic flowmeter manufacturer | Which domestic vortex flowmeter is better

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What is the fluctuation problem of electromagnetic flowmeter? Hello, KNKE, a manufacturer of electromagnetic flow meters imported from the United States, is pleased to answer your question. The signal of an electromagnetic flowmeter is generally 2.5-8mV, and may only be a few microvolts when the flow rate is low. The signal is small and easily affected by external interference. The main sources of interference are stray currents, static electricity, electromagnetic waves, and magnetic fields on the pipeline. Electromagnetic interference is one of the causes of instrument display fluctuations. The reasons for the instrument itself include poor contact between cables and terminals due to oxidation and corrosion, and poor contact between circuit boards. Poor soldering of electronic components, careless installation of sensors, and making the inner ring of the inlet gasket small to block the fluid channel, resulting in eddy currents and affecting the measurement. The insulation resistance of the excitation coil decreases, and the measurement electrode is contaminated, and the structure and insulation resistance decrease. Process reasons include: the process fluid has pulsating properties, such as the flow rate at the outlet of a reciprocating pump. Improper design and installation can cause the sensor to be installed in a position that does not meet the requirements, or the measuring tube may not be filled with liquid. The measured liquid may contain many bubbles, which can also cause display fluctuations. The fluctuation problem of electromagnetic flow meters imported from the United States can be checked and handled according to the following methods.

1、 The most effective measure to overcome electromagnetic int

erference is good grounding, and the grounding resistance of the sensor should be less than 100 Ω. Sometimes, although there is good grounding, the interference of stray currents in pipelines can also affect the normal display of electromagnetic flow meters. A new grounding point can be added several meters outside the original grounding point. Static electricity or electromagnetic waves can also interfere with instruments. Therefore, signal lines must use cables provided by the manufacturer and be properly grounded to minimize the distance between sensors and converters. If the fluctuation fault of the instrument cannot be solved, the separated instrument can only be replaced with an integrated one.

2、 The electromagnetic flowmeter displays occasional normal and fluctuating readings, mostly caused by poor electrical circuit connections. The wiring and terminals of the converter should be checked. The wiring can be unplugged, the cable can be shaken, and the converter housing can be tapped with a screwdriver to observe if there are any changes in the display.

3、 The second step of the inspection was carried out and no problems were found. You can go to the site to check the sensor, the contact status of the circuit, and whether the signal socket is corroded. If the socket is corroded, it needs to be replaced. If the insulation resistance of the excitation coil significantly decreases, drying should be used to increase the insulation resistance. The junction box of the sensor is damp, and the decrease in insulation resistance can also cause display fluctuations. Use a hair dryer to dry the water vapor and increase the insulation resistance to above 20M Ω. In addition to measuring insulation resistance, most

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