Thermocouple compensating conductor performance and use

In the work, we will find that sometimes when using thermocouple, may also need to match the compensation wire are used together, some people didn't know much for compensation conductor, so we have to learn some knowledge about thermocouple compensation wire, hope you can help to you.

would use the compensating conductor, in most cases, the hot electrode is used to expand the scope of the concrete, actually is to extend mobile thermocouple cold end, and connected with the display instrument of temperature measurement system. Can then be applied to different side heat device, now in petroleum, chemical industry, metallurgy and electric power department are used, the visible range of its application.

normally, we are working in the use of thermocouple, will probably maintain dozens of meters of distance with the temperature table, the cold end, also is the temperature and the temperature measurement table environment on the outlet temperature will there is a certain difference, the difference between dozens of degree can reach. To join in with the ordinary copper wires, so, according to the principle that we will know, in the connection position and produce thermoelectric potential, then will bring to our measurement error is larger.

however, in practice, if involves the need to compare the long-distance transmission wire, we also need not worry too much about the pressure drop which can form the problem. This is because of the high temperature measurement table input impedance, and the temperature potential transfer current generated by the thermocouple is small, so, usually, won't produce too much error problem, basically all is within the permissible range. So, if there is one transmitter, then can not use compensation wire, can satisfy the requirement of long distance transmission.

however, if we want to use the compensation wire, so long to pay attention to should choose the corresponding model, and the metal materials used must also meet the potential produced by temperature difference are very small in wiring place such a request, can minimize error, so the thermocouple temperature difference in the normal range.