Low k type thermocouple temperature 2 ℃ solution1

1 thermocouple compensation wire insulation layer is worn out, form a signal circuit grounding. This is important because the compensating conductor is hard, and in the terminal box was not placed flat and disposal problems during rotary screw terminal box cover touching their compensation conductor should be torn. Such problems reflected in the operator controls the temperature on the small average value.

2 pick anti thermocouple compensating lead wires. This is important infrastructure, display ( The problem) As a connection of a temporary form, artificial factor. When the thermocouple compensating lead wires connect the status is displayed, the operator control site shows usually than the practical value is small or large.

3 terminal box terminals poor contact. Hard for compensating conductor and thermocouple wires are compare, on-site maintenance fastening connection match difficult, therefore, have at the beginning the wire tightened the but again after period of time as the deformation of the wire is loose. Such problems reflected in the operator to control the temperature of the site for the value for no show or display value range.

4 signal shielding spare DCS bad earth contained in the cabinet. This problem very easily formed charge accumulation on the line, trigger signal drift or shaking. Due to the problem more difficult to find out the fault point, usually is the disposal measures to solve signal lines, the implement of discharge disposition.

5 temperature output signal after isolator, reflect on the operator control site temperature signal abnormalities. After changing the isolator is normal.

6 boiler tail flue measuring thermocouple fault rate is higher. Down when the thermocouple will be removed found thermocouple head including protective casing by flue gas flushing after serious wear and tear, will protect the casing under the wear resistant materials made from steel, to eliminate such problems hidden trouble.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor