The eddy-current displacement sensor is a commonly used measuring instrument, which can accurately measure the static and dynamic relative displacement changes between the measured body (if necessary, a metal conductor) and the end face of the probe, and has the advantages of flexible use, stable function, high reliability and simple protection.
The accurate measurement of oscillation and displacement is very important for stable operation, generally the oscillation and displacement probes are paired devices, if one is abnormal, if the temperature at the point and other related process objectives are not abnormal, it can be judged that the alarm is false, after years of experience eddy current sensor planning engineers put forward the primary reasons that can cause false alarms.
Probe device quality elements
The problems caused by the quality elements of the probe device are false alarms, and the causes of false alarms are loose and extended probe lock nuts, loose cable center joints or poor contact, and slip or loose pre-amplifier adapter joints.
Solution: When installing the probe, tighten the nut with a suitable tool, the nut loosening situation will not be presented in operation, but due to the multiple disassembly and long-term operation of the system, the central adapter joint is loose, or the poor contact may be presented in operation, which needs to be removed and cleaned in each overhaul of the oil impurities at the joint, and do a good job of insulation and sealing at the joint, in order to ensure that the central joint is tightened, after being tightened by hand, the ring can be fastened with needle nose pliers.
False alarms for problems caused by measurement lines
The common causes of false alarms caused by the measurement line are loose or poor contact of the preamplifier terminal, loose or poor contact of the terminal block, probe extension, broken cable, grounding of the line shielding wire, etc.
Solution: This kind of problem is not simple to judge, during the production and operation is not convenient to view thoroughly, if the problem is found, the solution is about the terminal loose or poor contact caused by the false alarm can be dealt with after the point of interlocking, about the cable skin, can be wrapped around the oil-resistant sealing tape or with a heat shrinkable tube at the broken skin, if the line shield wire is grounded, then need to be rewired, adopt anti-grounding measures The crimping terminal at the preamplifier is crimped many times, it is very simple to present damage, and the cable can not be pressedDue to the characteristics of the whole structure of the preprocessor, it is difficult to repair after the terminal is damaged, it is necessary to replace the new preprocessor, so that it has caused a great waste, advocate to add a terminal block between the preprocessor and again, so that the crimping terminal at the preprocessor only needs to connect the wire once, and the future view line is carried out at the newly added terminal row.
False alarms caused by probe problems
This kind of problem can not be dealt with during the operation of the unit, it is necessary to stop the treatment, the probe in the process of equipment transfer and disassembly, may be damaged due to bumps, and wear and damage the measuring coil at the end, so before each device, to check and verify, first check the appearance, the appearance is useless to measure its DC impedance, if in the case of significant shortcomings, within the specified range, it means that the probe is intact, if the appearance has significant shortcomings, such as the end has wear phenomenon, the cable skin is damaged, etc., after dealing with the damage, In addition to measuring the impedance, it is also necessary to use a special sensor standard calibration, calibration, after the calibration results are qualified, you can use this probe, no matter what kind of fault, during the operation of the unit, the on-site inspection can only carry out the following contents, under the premise of exempting from interlocking, check whether the wiring is normal, whether the terminal of the preamplifier is loose, whether the power supply voltage of the preamplifier is normal, if the center adapter of the probe is in the unit shell, in the external protection tube, you can check whether the center adapter is loose, whether the insulation is outstanding, if you want to do further checking, it is necessary to shut down.
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