Thermocouple common fault _ instrument

Thermocouple is a kind of common temperature measuring instrument, the scope of application is also very extensive. Fault phenomenon digital display table indicates a negative; Possible reasons: digital display table with thermocouple wiring is wrong or thermocouple have short circuit phenomenon; Processing method to correct wiring, or find out short circuit, reinforced insulation. Fault phenomenon of thermocouple table indicating infinity; Possible reasons: thermocouple or loosen the lead wire short circuit or terminal; Process change in resistance or welded and tighten the screw connection, etc. Malfunction phenomenon that thermocouple of the indicated value is lower than the actual value or unstable value; Possible reasons: protecting tube with metal dust, dust, dirt and thermocouple short circuit between terminal; Methods: to remove scrap metal, cleaning dust, water, etc. , find the short circuit point reinforced insulation. Fault phenomenon thermocouple value changes with the temperature relation; Thermocouple wire material corrosion may cause metamorphism; Deal with method: replace thermocouple;