Check the zero point instability of electromagnetic flow meter and take corresponding measures

Abstract: The information on the instability of the zero point of the electromagnetic flow meter and the corresponding measures to be taken is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. 1. The reason for the failure of electromagnetic flowmeter. The instability of the zero point can be roughly classified into five reasons for the failure. They are: 1. The electromagnetic flowmeter sensor is not perfectly grounded and is subject to external interference such as stray current: check item 3 of the flow chart. Pipeline stray External interference such as current is the main influence. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the article on the instability of the zero point of the electromagnetic flowmeter and the measures to be taken. 1. The reason for the failure of the electromagnetic flowmeter. The instability of the zero point can be roughly classified into five reasons for the failure. They are: 1. The electromagnetic flowmeter sensor is not perfectly grounded and is subject to external interference such as stray current: check the flow chart, item 3. Pipeline stray Current and other external disturbances mainly affect the good grounding protection of Zhongneng series electromagnetic flowmeters. Generally, the grounding resistance is required to be less than 1000. Do not share grounding with other motors and electrical appliances. Sometimes the environmental conditions are better, and Zhongneng series electromagnetic flowmeters can be grounded even if they are not grounded. It works normally, but once a good environment does not exist, the instrument will fail, and it will be troublesome to check again at that time. The change of the state of the electrical equipment near the flow sensor (such as the increase of leakage current) causes a change in ground potential, and the electricity will cause the zero point of the ZN series electromagnetic flowmeter to change. Please refer to Section 9 for the inspection method. 2 Reasons for the liquid of the electromagnetic flowmeter (such as liquid conductivity uniformity, electrode pollution, etc.); check the fourth item of the flow chart. The liquid conductivity changes or is uneven, which will change the zero point when it is still, and make the output when flowing. Therefore, the position of the flow meter should be far away from the injection point or the downstream of the chemical reaction section of the pipeline, and the flow sensor is best installed upstream of these places. If the liquid contains solid phase, or impurities deposit on the inner wall of the measuring tube, or scale on the inner wall of the measuring tube , or the electrode is contaminated by grease, etc., there may be zero-point fluctuations. Because the scale on the inner wall surface and the degree of contamination of the electrode cannot be exactly the same and symmetrical, it will destroy the balance of the initial set-up of the factory. Active measures are sufficient to remove contamination and Deposit the scale layer; if the zero change is not large, you can try to reset the zero again. 3 The signal loop insulation of the electromagnetic flowmeter is lowered. Check item 5 of the flowchart. The signal loop insulation drop will cause zero instability. The soil for the signal loop insulation drop should be The reasons are sufficient, which is caused by the insulation drop of the package electrode, but it cannot be ruled out that the insulation of the signal cable and its terminals is lowered or damaged. Because sometimes the on-site environment is very harsh, a little negligence in the sealing of the instrument cover/conductor connection is inadvertent, diffused Moisture acid mist or powder dust intrudes into the instrument junction box or cable protective layer, causing the insulation to drop. The signal loop insulation resistance inspection is carried out separately on the cable side and the flow sensor side, and is tested with a megohmmeter. Because the signal cable is easily accessible Do it first. The flow sensor is divided into two steps: fill the liquid to measure the electrode surface contact resistance and a tube, and then measure the U-pole insulation resistance. 4/Check the electrode contact resistance and electrode insulation resistance in 2 steps. (1) Filled with liquid Measure the liquid contact resistance on the surface of the electrode. Remove the signal cable from the flow sensor. Use a multimeter to measure the resistance between each electrode and the grounding point. '1/Measurement of electrode contact resistance' will be further explained. (2) Empty tube measurement of electrode insulation and venting of the measuring tube, wipe the inner surface with a dry cloth, and after it is completely dry, use a H500VDC megger to measure the distance between each electrode and the ground The resistors, the resistance value must be 100MΩThe above.. The above is the entire content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Check the zero point instability of electromagnetic flow meter and take corresponding measures'
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