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Electromagnetic flowmeter common problems
1. How to treat the electromagnetic flowmeter as zero reputation?
Answer: (1) Fill the pipe with liquid to change the installation method or installation location.
(2) Remove and wash the electrode.
2. What should I do if the electromagnetic flowmeter is not working properly when thunder and other surge voltages are generated?
Answer: (1) The sensor is connected to the ground wire.
(2) If the grounding wire is grounded, check the grounding fault condition.
3. When the polymer flooding injection well water meter occurs, the estimated water time should not exceed how long?
Answer: The polymer flooding human well water meter is faulty, and the estimated water time cannot exceed 24h.
4. How to choose the electromagnetic flowmeter correctly and reasonably?
Answer: The selection of electromagnetic flowmeter should consider the five conditions of caliber and range, pressure, temperature, lining material and electrode material, and on-site working conditions.
5, electromagnetic flowmeter installation environment should choose?
Answer: (1) There should be no strong vibration in the installation site.
(2) Equipment with strong electromagnetic fields (such as large electric motors, large transformers) should be avoided as much as possible;
(3) Choose a place that is convenient for maintenance and convenient for activities.
6. What is the cause of the electromagnetic flowmeter showing fluctuations of more than 10% at the beginning of the operation?
Answer: (1) When the horizontal installation, the fluid does not fill the entire pipeline.
(2) The grounding is faulty.
7. What is the reason why the electromagnetic flowmeter in operation shows the jump?
Answer: (1) The electrode is completely covered or heavily covered by the insulating object.
(2) The insulation of the electrode to the ground is lowered due to leakage at the electrode or the like.
(3) Pulsating flow.
8. When the electromagnetic flowmeter is installed vertically, what are the requirements for the medium?
Answer: (1) The direction of media flow should be from bottom to top.
(2) Pass the transmitter to ensure that the measuring tube is filled with media.
9. What is the principle of the electromagnetic flowmeter at the injection station? What parts does it consist of?
A: The electromagnetic flowmeter used in the injection station is made according to the Faraday electromagnetic induction principle. It consists of a transmitter and a converter.
10. What is the working principle of the electromagnetic flowmeter of the injection station?
Answer: The measured medium flows through the transmitter to generate an induced electromotive force, which is then converted by the converter into a 0-20 mA or 4-20 mA DC signal output.
11. What are the characteristics of electromagnetic flowmeters?
Answer: (1) It can accurately measure the flow rate, which is a non-volumetric meter;
(2) The measurement range is wide, the reaction is fast, and the pressure loss is small.
(3) The temperature, pressure, viscosity and flow state of the liquid to be tested have little effect on the displayed value of the meter.
12. What are the advantages of electromagnetic flowmeters in use?
Answer: (1) The transmitter structure is simple and reliable, there are no moving parts and throttling parts, no blockage occurs, and the fluid passes without no head loss;
(2) It is not affected by changes in physical parameters such as temperature, viscosity, density, pressure, etc. of the measured medium;
(3) The range adjustment range is large, up to 1:100;
(4) No mechanical inertia, sensitive response, easy to use and maintain.
13. For the newly installed electromagnetic flowmeter, how to judge the fault during the operation?
A: For the newly installed electromagnetic flowmeter, the fault can be judged according to the output current of the converter or the indication of the digital display during operation.
14. After the installation of the electromagnetic flowmeter is completed, what should be checked before power-on?
Answer: 1. Check whether all the laid cables are good, whether there is any fault, short circuit, insulation, etc.
2. The explosion-proof electromagnetic flowmeter must check whether the junction box enclosed by the cable is sealed with the cabinet.