Fabricated thermocouples are widely used. However, some failures are inevitable during use. When you are dedicated to maintaining and assembling thermocouples, you should also know some common troubleshooting methods. Let’s introduce fabricated thermocouples. Troubleshooting. One: The thermoelectric potential is larger than the actual one. Possible reasons: the compensation wire does not match the thermocouple model; the insertion depth is not enough or the installation position is incorrect; the thermoelectrode is deteriorated; interference signals enter; the temperature of the thermocouple reference terminal is too high. Treatment method: replace the compensation wire of the same model; change the installation position or insertion depth; replace the thermocouple; check the interference source and eliminate it; adjust the reference terminal temperature or make corrections. Two: The thermoelectric potential is lower than the actual value. Possible reasons: short circuit; short circuit between the terminals in the thermocouple junction box; short circuit of the compensation wire due to insulation burnout; compensation wire and thermocouple do not match; compensation wire and thermocouple polarity connection; The insertion depth is not enough and the installation position is wrong; the temperature of the cold junction of the thermocouple is too high. Treatment method: after inspection, if it is caused by humidity, it can be dried; if it is due to poor insulation of the porcelain tube, it should be replaced; open the junction box and brush the wiring board clean; re-insulate the short-circuit or replace with a new compensation wire; replace with the same Type of compensation wire; reconnect it correctly; change the installation position and insertion depth; replace the connecting wire of the thermocouple with a compensation wire to move the cold end away from the high temperature area. Three: The indication of the measuring instrument is unstable, sometimes no longer, sometimes high and sometimes low. Possible reasons: poor contact of the hot electrode at the terminal; intermittent short-circuit or intermittent grounding of the thermocouple; the hot electrode is broken or seems to be broken; The thermocouple is not firmly installed and swings; the compensation wire is grounded or intermittently short-circuited. Treatment method: reconnect it; take out the hot electrode of the thermocouple from the protection tube, find out the fault point and eliminate it; replace the new electrode; install it firmly; find out the fault point and eliminate it.
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