Electromagnetic flowmeter common 4 kinds of failure

Case introduction

　　1. No flow output. Check whether there is a failure in the power supply surface, test whether the power supply voltage is normal; test the fuse; check whether the sensor arrow is consistent with the direction of fluid flow, such as inconsistency in the direction of the sensor installation; check whether the sensor is full of fluid, such as not full of fluid, replace the pipe or vertical installation.

　　2. The signal is getting smaller and smaller or suddenly drop. Test whether the insulation between the two electrodes is damaged or short-circuited, the resistance between the two electrodes is normal between (70 ~ 100) Ω; measuring tube wall may be deposited dirt, should be cleaned and wiped electrodes, do not scratch the lining. Measure whether the tube lining is damaged, such as damage should be replaced.

　　3. Zero instability, check whether the medium is full of measuring tube and whether there are air bubbles in the medium, such as air bubbles can be installed in the upstream of the additional deflator, such as the horizontal installation can be changed to vertical installation; check whether the instrument grounding is intact, such as bad, should be a three-tier grounding (grounding resistance of ≤ 100 Ω); check the conductivity of the medium should be not less than 5 μs/cm; check the medium whether the measurement of the tube is silted up, clearing the lining, pay attention to do not Scratch the lining.

　　4. The flow indication value does not match the actual value. Check whether the fluid in the sensor is full of pipe, there are no bubbles, such as bubbles in the upstream can be installed deflator; check whether the grounding is good; check whether there is a valve upstream of the flowmeter, if so, move to the downstream or make it fully open; check whether the converter range is set correctly, such as faults, to re-set the correct range.

　　5. Display value in a certain interval bumps. Check whether the environmental conditions change, such as the emergence of new sources of interference and other magnetic sources affecting the normal operation of the instrument or vibration, etc., should be promptly cleared of interference or displacement of the flowmeter; check the test signal cable, with insulating tape for the end of the division, so that the wire, the inner shielding layer, the outer shielding layer, the shell is not in contact with each other.

　　Electromagnetic flowmeter is a measurement of the volume flow of conductive media inductive instrumentation. In addition to measuring the volume flow of general conductive liquids, can also be used to measure the volume flow of strong corrosive liquids such as strong acids and alkalis and uniform liquid-solid two-phase suspended liquids such as slurry, slurry, pulp, etc., Jichuang Instrumentation is an electromagnetic flowmeter manufacturer.