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    Home > Active Ingredient News > Drugs Articles > Analysis and treatment of common faults of thermocouples

    Analysis and treatment of common faults of thermocouples

    • Last Update: 2018-05-22
    • Source: Internet
    • Author: User
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    Common faults of thermocouple temperature sensor: the thermoelectric potential is smaller than the actual value cause analysis: treatment method: if the short circuit is caused by humidity after inspection, it can be dried; if the porcelain tube insulation is poor, the thermocouple should be replaced Open the junction box for short circuit between the terminals in the junction box, clean the junction board, and replace the compensation lead with a new one due to the short circuit caused by the burned insulation, or replace the compensation lead with a new one due to the mismatch between the compensation lead and the thermocouple, and replace it with a compensation lead of the same type Change the installation position and insertion depth when the compensation wire and thermal dipole are connected reversely If the temperature of the cold end of the thermocouple is too high, reconnect it correctly If the insertion depth is not enough and the installation position is not correct, replace the connecting wire of the thermocouple with the compensation wire, so that the cold end moves away from the high temperature area Common faults of thermocouple temperature sensor: the thermoelectric potential is larger than the actual cause analysis: treatment method: the insertion depth is not enough or the installation position is not changed or the insertion depth thermoelectric pole is deteriorated to replace the thermocouple The compensation wire does not match the thermocouple model Replace the compensation wire of the same model with interference signal Check the interference source Eliminate the high temperature at the reference end of the thermocouple Adjust or correct the temperature at the reference end Common faults of thermocouple temperature sensor: the indication of measuring instrument is not stable, sometimes not, sometimes high, sometimes low reason analysis: treatment method: poor contact of thermoelectric pole at the terminal, reconnection of thermocouple, intermittent short circuit or intermittent grounding Take out the thermoelectric pole of thermocouple from the protective tube, find out the fault point and eliminate it Replace it with a new one if the thermoelectric pole is broken or seems to be broken The thermocouple is not firmly installed when it swings Find out the fault point and eliminate the common fault of thermocouple temperature sensor when the compensation lead has grounding or intermittent short circuit phenomenon: analysis of the big reason of thermocouple potential error: treatment method: replace the thermocouple when the thermoelectric pole is deteriorated Improper installation position and method of thermocouple change the installation position and method too much scale on the surface of thermowell clean the short circuit of measuring line (thermocouple and compensation wire) and replace the insulation at the short circuit Find the broken part of thermocouple circuit, and reconnect the terminal, loosen and tighten the terminal
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