Thermocouple temperature compensation issue
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K-type thermocouple, with a junction box on site; one wiring method: the compensation wire runs all the way to the cabinet room and is connected to the temperature safety barrier (with room temperature compensation). Another wiring method: The compensation wire is connected to the field temperature transmitter, which then outputs 4–20 mA to the analog safety barrier. Are these two temperatures the same? I have a question: the thermoelectric element on the working side equals the reference side plus the thermoelectric element in the circuit. The thermoelectrical potential at the same point is identical; the temperature for compensation due to temperature changes is taken from the outdoor environment, while the temperature for compensation using a temperature safety barrier is taken from the indoor environment. Given the large difference in temperature between indoors and outdoors, how can the temperatures remain the same? Why?
Now, various systems come equipped with TC card modules. Isn’t it better to go straight to the card holder? Why does it have to be heated?
The compensation wire used at the heating transformation site is short; if it’s an integrated model with a display, that could be an option to consider. Of course, sometimes it seems that adding a temperature control introduces an additional point of failure, so the design involves weighing various pros and cons.
The price of the compensation wire is also a factor to consider
"Temperature safety barrier (with room temperature compensation)? For example: 5 mv input, and an output of 5.03 mv after room temperature compensation?
This post was last edited by jlshnlhj on 2020-11-18 at 10:49. \"Temperature safety gate (with room temperature compensation)?\" For example, an input of 5 mv results in an output of 5.02 mv after room temperature compensation. It seems that temperature safety gates do not have cold-junction temperature compensation. First, it is necessary to understand that the function of the compensation wire is to extend the cold end of the thermocouple to the end of the compensation wire. Outdoor temperature variation compensation relates to the outdoor cold-end temperature, while indoor temperature variation compensation pertains to the indoor cold-end temperature. When there is a large difference between the outdoor and indoor temperatures, the temperature would otherwise remain unchanged; it is the function of the compensation wire that extends the cold end of the thermocouple to the location of the temperature transmitter.