The main failure phenomena of platinum and rhodium thermocouples are: 1. The thermoelectric potential is smaller than the actual value; 2. The thermoelectric potential is larger than the actual value; 3. The indication of the measuring instrument is unstable, sometimes no, sometimes high and sometimes low; 4. Thermoelectric The even potential error is large. 1. There are several reasons for the failure phenomenon of platinum-rhodium thermocouple whose thermoelectric potential is smaller than the actual value: (1) Short circuit. (2) There is a short circuit between the terminals in the thermocouple junction box. (3) The compensation wire is short-circuited due to burnout of insulation. (4) The compensation wire does not match the thermocouple. (5) The polarity of the compensation wire and the thermocouple is reversed. (6) The insertion depth is not enough and the installation position is wrong. (7) The temperature of the cold junction of the thermocouple is too high. The detailed treatment method of the fault that the thermoelectric power is smaller than the actual value: (1) 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. (2) Open the junction box and clean the wiring board. (3) Re-insulate the short-circuit or replace with a new compensation wire. (4) Replace with the same type of compensation wire. (5) Reconnect correctly. (6) Change the installation position and insertion depth. (7) The connecting wire of the thermocouple is replaced with a compensation wire to move the cold end away from the high temperature area. There are several reasons for the failure phenomenon that the thermoelectric potential of the two platinum rhodium thermocouple is larger than the actual one: (1) The compensation wire does not match the thermocouple model. (2) The insertion depth is not enough or the installation position is wrong. (3) Deterioration of the hot electrode. (4) There is interference signal entering. (5) The reference terminal temperature of the thermocouple is too high. The detailed treatment method of the fault that the thermoelectric potential is larger than the actual one: (1) Replace the compensation wire of the same model. (2) Change the installation position or insertion depth. (3) Replace the thermocouple. (4) Check the source of interference and eliminate it. (5) Adjust the reference terminal temperature or make corrections. 3. The thermocouple has unstable indications of the measuring instrument, sometimes no, sometimes high and sometimes low, and there are several reasons for the failure phenomenon: (1) The hot electrode is in poor contact at the terminal. (2) The thermocouple has intermittent short circuit or intermittent grounding. (3) The hot electrode is broken or seems to be broken but not broken. (4) The thermocouple is not firmly installed and swings. (5) The compensation wire is grounded or intermittently short-circuited. The indication of the measuring instrument is unstable, sometimes no, sometimes high and sometimes low. Detailed processing method: (1) Reconnect it. (2) Take out the hot electrode of the thermocouple from the protection tube, find out the fault point and eliminate it. (3) Replace with new electrodes. (4) The installation is firm. (5) Find out the point of failure and eliminate it. Four. There are several reasons for the failure phenomenon of platinum-rhodium thermocouple with large thermocouple electric potential error: (1) Deterioration of the thermoelectrode. (2) The installation position and method of the thermocouple are improper. (3) The surface area of u200bu200bthe thermocouple protection sleeve is too dirty. (4) The measuring circuit is short-circuited (thermocouple and compensation wire). (5) The thermocouple circuit is disconnected. (6) The terminal is loose. The detailed troubleshooting method of platinum rhodium thermocouple with large potential error: (1) Replace the thermocouple. (2) Change the installation location and installation method. (3) Clean up. (4) Replace the insulation again at the short-circuit. (5) Find the disconnection and reconnect it. (6) Tighten the terminal.
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