Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-09-13
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Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-09-13: Discussion question: 234. What is the function of compensation wires?
A compensation wire is a pair of insulated wires that maintain the same nominal value of thermoelectromotive force as that of the thermocouple they are connected to, over a certain temperature range (including room temperature of 0). These wires are used to connect the thermocouple to the measuring device, in order to compensate for errors caused by temperature changes at the point where they are connected to the thermocouple.
By using inexpensive metal wires, it is possible to extend the two ends of the thermocouple, moving its cold end to a location where the temperature is relatively stable, thereby reducing the impact of changes in the cold-end temperature on the measurements.
By using inexpensive metal wires, it is possible to extend the two ends of the thermocouple, moving its cold end to a location where the temperature is relatively stable, thereby reducing the impact of changes in the cold-end temperature on the measurements.
Function: (1) It is used to extend the cold end of the thermocouple, connecting it to a temperature measuring device to form a temperature measurement system, thereby moving the reference end of the thermocouple from a high-temperature environment to a place where the ambient temperature is more stable. (2) Saving a large amount of expensive and rare metal materials used in manufacturing thermoelectrodes ； (3) Using compensation wires facilitates installation and wiring ； (4) Replacing the thermoelectric electrode with a compensation wire of larger diameter and higher electrical conductivity can reduce the resistance of the thermocouple circuit, facilitating measurement and automatic control.
Compensation wires are a pair of insulated wires that, within a certain temperature range (including room temperature of 0), have a nominal value for the thermoelectromotive force identical to that of the thermocouple they are paired with. They are used to connect the thermocouple to the measuring device, in order to compensate for the errors caused by temperature changes at the points where they connect to the thermocouple.
A compensation wire is a pair of insulated wires that maintain the same nominal value of thermoelectromotive force as that of the thermocouple they are connected to, over a certain temperature range (including room temperature of 0). These wires are used to connect the thermocouple to the measuring device, in order to compensate for errors caused by temperature changes at the point where they are connected to the thermocouple.
It involves extending the cold end of the thermocouple from a location with higher and more unstable temperatures to a location with lower and more stable temperatures, so as to keep the temperature of the cold end constant.
By using inexpensive metal wires, it is possible to extend the two ends of the thermocouple, moving its cold end to a location where the temperature is relatively stable, thereby reducing the impact of changes in the cold-end temperature on the measurements.
A compensation wire is a pair of insulated wires that maintain the same nominal value of thermoelectromotive force as that of the thermocouple they are connected to, over a certain temperature range (including room temperature of 0). These wires are used to connect the thermocouple to the measuring device, in order to compensate for errors caused by temperature changes at the point where they are connected to the thermocouple.
Eliminate the impact of external changes on measurement values