Thermocouple and thermal resistance identification method
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The first is to look at the lead of the temperature measuring component. Usually, the thermocouple has only two lead wires. If there are three lead wires, it is a thermal resistor. However, for four lead wires, it is necessary to measure the resistance value to determine whether it is a double thermocouple or a four-wire thermal resistor. First find two pairs of lead wires with almost zero resistance from the four lead wires, and then measure the resistance between the two pairs of lead wires. If it is infinite, it is a pair of thermocouples, and the pair of resistance values ​​is almost zero. The lead wire is a thermocouple. If the resistance of the two pairs of lead wires is between 10 and 110, it is a single four-wire thermal resistance. If the resistance value of the pair of lead wires is closest to the thermal resistance of the indexing number, it is the thermal resistance of the indexing number. .
If there are only two lead wires, you can use a digital multimeter to measure the resistance value to judge. Since the resistance value of the thermocouple is small, the thermal resistance is almost zero; if the resistance value is small when measuring, it may be a thermocouple.
The thermal resistance at room temperature will also have a minimum resistance value greater than 10. Common thermal resistances are Pt10, Pt100 platinum thermal resistance, Cu50, Cu100 copper thermal resistance of four index numbers. At room temperature 20 °C, the resistance value Pt10 is 10.779, Pt100 is 107.794, Cu50 is 54. 285, Cu100 is 108.571. When the room temperature is greater than 20 ° C, the resistance value is larger, and the resistance values ​​of both are mostly judged. If it is a thermal resistor, you can know what thermal resistance is the indexing number.
You can also find an easily available heat source to judge and identify by heating the temperature measuring element. If you can pick up the hot water of the cup dispenser, put the measuring end of the temperature measuring component into the hot water, use the digital millimeter of the digital multimeter to measure whether it has a thermoelectric potential, and the thermoelectric potential is the thermocouple according to the thermoelectric potential. With the thermocouple indexing table, you can determine what thermocouple is the indexing number. When there is no thermoelectric potential, the resistance value is measured. If there is a resistance value rising, the thermal resistance is the trend. The measurement end of the temperature measuring element can also be heated using an electric soldering iron or an electric oven to determine the identification.
