Electromagnetic flowmeter is a kind of inductive instrument for measuring the volume flow of conductive media. While performing on-site monitoring and display, it can output standard current signals for recording, adjustment, control, automatic control of detection, and long distance of signals. Transmission. Electromagnetic flowmeters can be widely used in flow measurement of conductive liquids in tap water, chemical industry, coal, environmental protection, textile, metallurgy, papermaking and other industries, and are highly evaluated.
In view of the common faults encountered in the use of electromagnetic flowmeters, the Technical Department of Qingtian Instrumentation Co., Ltd. gives the following points in the hope of resolving the doubts for the owners:
1. No flow output. Check if there is a fault in the power supply section, test whether the power supply voltage is normal, test the fuse off, check whether the sensor arrow is in line with the flow direction of the fluid, and replace the sensor installation direction if it is inconsistent. Check whether the sensor is full of fluid, if there is no full fluid, replace the pipe or install it vertically. .
2. The signal is getting smaller or smaller. Test whether the insulation between the two electrodes is broken or short-circuited. The resistance between the two electrodes is normally between (70 and 100) Ω. The inner wall of the measuring tube may be fouled. The electrodes should be cleaned and wiped. Do not scratch the inner lining. Measure the lining of the tube for damage, and replace it if it is damaged.
3. The zero point is unstable. Check whether the medium is full of air bubbles in the measuring tube and the medium. If air bubbles exist, an air eliminator can be installed upstream. If it is installed horizontally, it can be changed to vertical installation. Check if the instrument ground is intact. If it is not good, Conduct three-level grounding (grounding resistance ≤ 100Ω); check that the conductivity of the medium is not less than 5μs/cm; check whether the medium is deposited in the measuring tube and be careful not to scratch the lining.
4. The flow indicator does not match the actual value. Check whether the fluid in the sensor is full of tubes, with or without bubbles, if there is air bubbles, install an air eliminator upstream; check whether each grounding condition is good; check if there are valves upstream of the flowmeter; if so, move it downstream or make it fully open. Check whether the converter range setting is correct. If not, reset the correct range.
5. The indicator fluctuates within a certain range. Check whether the environmental conditions change, such as new interference sources and other magnetic sources or vibrations that affect the normal operation of the instrument, remove the interference or displace the flowmeter in time; check the test signal cable, and perform the end treatment with insulating tape. The conductors, the inner shield, the outer shield, and the housing do not contact each other.
Qingtian Instrument has professional first-class R&D, design, technology, and production teams. The electromagnetic flowmeters and other products it produces are exported to many provinces and cities in China, and exported to more than 40 countries overseas and received unanimous praise. Welcome new and old customers to visit our factory.
The buffer tank can be installed before the flow meter, or the length of the metering straight pipe upstream of the flow meter can be lengthened.
Timely measurement of the flowmeter to ensure that the value is accurate and reliable.
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