Changzhou Osco manufacturers straight compensation wire price is excellent. What is a compensating wire? The compensation wire is a pair of conductors with an insulating layer that have the same nominal value of the thermoelectric motive force of the matching thermocouple within a certain temperature range (including room temperature 0), and use them to connect the thermocouple and the measuring device to compensate for the error caused by the temperature change at the connection between them and the thermocouple. After knowing what is the compensation wire, what is the role of the compensation wire? What are the problems to pay attention to when using compensation wires?

Compensation wire action:

1), conducive to the thermocouple reference end temperature correction and centralized control.

The measuring instrument is generally installed away from the heat source and the ambient temperature is stable, and the junction box of the common thermocouple (where the reference end is installed) is very close to the measured object. The reference end of the thermocouple must be connected to the instrument by wire. If the thermocouple is connected with ordinary copper wire, the reference end temperature is high and unstable, which brings error to the measurement. If the thermocouple is extended so that the reference end of the thermocouple is away from the heat source, it is theoretically possible, but it will cause waste of thermal electrode materials. Compensation wire is produced to solve this contradiction. It is characterized by a thermocouple composed of two poles of the compensation wire within the possible range of change in the reference end temperature (0-100 ° C or 0-150 ° C) whose thermoelectric characteristics are the same as those of the matched thermocouple, namely:

Ea'b' (tn, 0) =Eab (tn, 0)

According to the law of intermediate temperature, after the thermocouple loop is added with the compensation wire, its thermoelectric potential is only related to the temperature t at the measuring end and the compensation wire is connected to the instrument t0, and is unrelated to the change of the reference end temperature tn, just like the thermal electrode is extended to the instrument, so the role of the compensation wire is only to extend the thermocouple, it can not eliminate the influence of the reference end temperature is not 0℃. Therefore, it is necessary to use methods such as 0℃ thermostat method, calculation method, instrument automatic compensation method, etc., to correct the reference temperature of the thermocouple to 0℃.

2), can save a lot of expensive metal materials, such as platinum rhodium 10-platinum thermocouple, can choose the family copper-nickel copper compensation wire.

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