|信息来源： 华恒 | [ 2019-05-21 ] 点击量： 153|
Typical Fault Diagnosis and Processing of Electromagnetic Flowmeter?Xi'an Huaheng Instrument for you to introduce:
1.Electromagnetic flowmeter has no flow output.Check whether there is a fault in the power supply,test whether the power supply voltage is normal;test whether the fuse is on and off;check whether the arrow of the sensor is consistent with the flow direction of the fluid,such as inconsistent changing the direction of the sensor installation;check whether the sensor is full of fluid,such as not full of fluid,replace the pipeline or install vertically.
2.The signal of electromagnetic flowmeter becomes smaller and smaller or drops suddenly.To test whether the insulation between the two electrodes is damaged or short-circuited,the resistance between the two electrodes is between(70-100)_.The inner wall of the measuring tube may deposit dirt.The electrodes should be cleaned and wiped,and the inner lining should not be scratched.Measuring pipe lining is damaged,if damaged,it should be replaced.
3.When the zero of the electromagnetic flowmeter is unstable,check whether the medium is full of measuring tubes and whether there are bubbles in the medium.If there are bubbles,the gas eliminator can be installed upstream,and if it is installed horizontally,it can be installed vertically.If the instrument is not well grounded,it should be grounded at three levels(grounding resistance is less than 100_).Check the conductivity of the medium should not be less than 5 micros/cm;Check whether the medium is silted in the measurement.In the measuring tube,be careful not to scratch the lining when cleaning.
4.The flow indication value of electromagnetic flowmeter is not consistent with the actual value.Check whether the fluid in the sensor is full of pipes,whether there are bubbles,if there are bubbles,the gas eliminator can be installed upstream;check whether the grounding condition is good;check whether there are valves upstream of the flowmeter,if there are,move downstream or make it fully open;check whether the range setting of the converter is correct,if not,reset the correct range.
5.The indication of electromagnetic flowmeter fluctuates in a certain range.Check whether the environmental conditions have changed,such as the emergence of new interference sources and other magnetic sources or vibrations that affect the normal operation of the instrument,the interference should be removed or the flowmeter should be shifted in time;check the test signal cables,and use insulating tape for end treatment,so that the conductor,the inner shield layer,the outer shield layer and the shell do not contact each other.
Electromagnetic flowmeter must be electrically conductive to measure flow.Therefore,non-conductive gases,steam,oil,copper propylene and other substances can not use electromagnetic flowmeter to measure flow.
PS:Types of Tianjin pressure transmitter,typical fault diagnosis and treatment of electromagnetic flowmeter!