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Sewage flowmeter buried underground with the pipeline, the sensor has IP68 protective structure, the converter is installed in the instrument box or indoor, the two are connected by cables, due to ground subsidence, the mountain environment and other changes in the field conditions, sensors and converters are not complete Do a good job of cable joint moisture (waterproof) and other processing. Just as the joint is in a humid environment, such as instrument wells, cable trenches, etc., moisture intrudes into the cable connector, all of which may cause the following:
(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 flowmeter of the hot water flow meter is also variable, and then fluctuations occur;
(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.
Sewage flowmeter above abnormal conditions due to occur in the signal loop, to determine a certain degree of difficulty, only in-depth site, in the exclusion of circulating water flowmeter other possible faults, it should check whether there are problems with the cable, on-site maintenance personnel as long as the field excitation The loop resistance measurement value is compared 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.
Sewage flow meters will basically not fail within a year or more after they are put into operation. However, one year later, abnormal work will often occur. The specific manifestations are that the measured values ​​will become larger or smaller, or they will continue to fluctuate. Inspections have ruled out the possibility that the pipeline is not full of pipes, medium gas, etc. It has been found that such problems may also be related to faults in the cable lines.
Sewage flow meter
(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 flowmeter of the hot water flow meter is also variable, and then fluctuations occur;
(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.
Sewage flowmeter above abnormal conditions due to occur in the signal loop, to determine a certain degree of difficulty, only in-depth site, in the exclusion of circulating water flowmeter other possible faults, it should check whether there are problems with the cable, on-site maintenance personnel as long as the field excitation The loop resistance measurement value is compared 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.
Sewage flow meters will basically not fail within a year or more after they are put into operation. However, one year later, abnormal work will often occur. The specific manifestations are that the measured values ​​will become larger or smaller, or they will continue to fluctuate. Inspections have ruled out the possibility that the pipeline is not full of pipes, medium gas, etc. It has been found that such problems may also be related to faults in the cable lines.
Sewage flow meter
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