Common causes of abnormal operation of sewage electromagnetic flowmeter
Chain G80,G80 Lifting Chain,G80 Chain Guangdong Gongyou Lift Slings Machinery CO.,LTD , https://www.gongyouslings.com
April 13 10:06:46, 2024
(1) The insulation of the excitation coil is reduced to ground, resulting in a small measurement result;
(2) The contact resistance of the excitation circuit cable connection becomes large, the excitation circuit of the converter is in a non-constant current working region, and the excitation current is decreased, which also causes the measurement result to be too small. If the contact resistance is unstable, the measurement value fluctuates.
(3) The insulation of the signal line to the ground decreases, causing signal attenuation, and finally the measurement result is too small;
(4) The insulation performance of the signal line excitation line to ground is declining, making the measurement result much larger than normal data. If the interference is not stable, the influence on the meter of the hot water flow meter is also variable, followed by fluctuations;
(5) The contact resistance at the connection point of the signal cable becomes larger, so that the measured value becomes smaller. If the contact resistance is not stable, the measured value cannot be stabilized and interference can be easily introduced.
The above abnormal conditions occur in the signal loop, so it is difficult to judge. Only in-depth scene, after troubleshooting the other possible problems of the circulating water flowmeter, it is necessary to check whether the cable is in trouble. The on-site instrument maintenance personnel only needs to measure the field resistance of the field loop resistance. Compare the value with the data provided by the manufacturer, test the grounding resistance, determine the problem step by step, and then take measures, or replace the entire cable, or keep the cable connector dry.