The working principle of compensation cable thermocouple alloy wire share
Compensation cable Thermocouple alloy wire is a pair of wires with insulation layer with the same nominal value as the thermal electromotive force of the matching thermocouple in a certain temperature range. They are used to connect the thermocouple and the measuring device to compensate for the error caused by the temperature change at the connection between the thermocouple and the thermocouple. Heat resistance: the alloy wire of the compensation wire for heat resistance shall be subjected to the heat resistance test at 220±5 ℃ for 24 hours, and the surface shall be free of cracks after bending the sample on a cylinder 5 times its diameter by 180 degrees. The insulation resistance between the cores of the alloy wire of the compensation wire and between the core and the shielding layer shall not be less than 25MΩ per meter.
As we all know, the use of all electrical appliances around us is inseparable from the wire, that is, the use of the power cord we often say, whether it is an external power cord or the power cord inside our electrical appliances, it is very important to use our electrical appliances. Compensation cable thermocouple alloy wire is the wire we often encounter in electrical appliances, and its role is very large, let's take a look at the working principle of the thermocouple alloy wire of the compensation cable. I hope you can follow the editor to understand it.
According to the principle of thermocouple temperature measurement, the size of the thermocouple loop is not only related to the hot end temperature, but also related to the cold end temperature. Only when the cold end temperature remains unchanged, the thermoelectric potential is a single-valued function of the measured hot end temperature. The thermocouple indexing table and the display instrument calibrated according to the indexing table require a constant cold junction temperature of 0 ℃, otherwise the measurement error will occur. However, in practical applications, because the cold end of the thermocouple is usually very close to the hot end, and the cold end (junction box) is exposed to the air, the thermocouple alloy wire of the compensation cable is affected by the temperature fluctuation of the surrounding environment, and the temperature of the cold end is difficult to keep constant, and it is even more difficult to keep it at 0 ℃. Therefore, in order to eliminate the influence of the cold end temperature change and not 0 ~ C in the temperature measurement process, the cold end temperature compensation must be carried out. Thermocouple compensation cable is usually composed of alloy wire, insulation layer, sheath and shielding layer.
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