Industrial thermocouple and thermal resistance to protect the shape of the casing is almost the same, some temperature measuring element shape is very small, such as armor, both appearance and basically the same, with no nameplate, and don't know what type of cases, the following methods can be used to identify.
The first is to look at the output line of the temperature measuring element. Usually, the thermocouple only has two leads. If there are three leads, it is the thermal resistance. However, for those with four leads, the resistance value needs to be measured to determine whether it is a two-branch thermocouple or a four-wire thermistor. From four lead to two of lead wire resistance is almost zero, and then measure the resistance value between the two to lead, if to infinity, that was double the thermocouple, a pair of lead wire resistance value is almost zero is a thermocouple. If the two of lead wire resistance between 10-110 Ω, is the thermal resistance of the single four wire, look at its resistance and the thermal resistance of the closest to what degree, is the thermal resistance of the index number.
If there are only two leads, the resistance value can be measured by the digital multimeter. Since the resistance value of the thermocouple is small, the thermal resistance is almost zero. If the resistance is small, it could be a thermocouple.
At room temperature, the minimum resistance is also greater than 10. Commonly used have Pt10, Pt100 platinum thermal resistance, thermal resistor Cu50, four Cu100 copper heat resistance index number, when the room temperature is 20 ℃, its resistance Pt10 for 10. 779 Ω, Pt100 is 107. 794 Ω, Cu50 is 54. 285 Ω Cu100 Ω 108.571. Room temperature is greater than 20 ℃ when the resistance is bigger, compare the two most of the resistance value judgment. If it's a thermal resistor, you know what the scale is.
It is also possible to find an easily available heat source, which can be judged and identified by heating the temperature measuring element. If hot water of can pick up a cup of water dispenser, the measurement end of temperature measuring element into the hot water, use digital multimeter dc millivolt block, measure it have thermoelectric potential, a thermoelectric potential is thermocouple based on thermoelectric potential thermocouple indexing table lookup, you can judge what is dividing the thermocouple. When there is no thermoelectric potential, it is measured whether there is any change in its resistance value. The measuring end of the heating temperature measuring element of electric soldering iron or electric oven can also be used to judge and identify.
The first is to look at the output line of the temperature measuring element. Usually, the thermocouple only has two leads. If there are three leads, it is the thermal resistance. However, for those with four leads, the resistance value needs to be measured to determine whether it is a two-branch thermocouple or a four-wire thermistor. From four lead to two of lead wire resistance is almost zero, and then measure the resistance value between the two to lead, if to infinity, that was double the thermocouple, a pair of lead wire resistance value is almost zero is a thermocouple. If the two of lead wire resistance between 10-110 Ω, is the thermal resistance of the single four wire, look at its resistance and the thermal resistance of the closest to what degree, is the thermal resistance of the index number.
If there are only two leads, the resistance value can be measured by the digital multimeter. Since the resistance value of the thermocouple is small, the thermal resistance is almost zero. If the resistance is small, it could be a thermocouple.
At room temperature, the minimum resistance is also greater than 10. Commonly used have Pt10, Pt100 platinum thermal resistance, thermal resistor Cu50, four Cu100 copper heat resistance index number, when the room temperature is 20 ℃, its resistance Pt10 for 10. 779 Ω, Pt100 is 107. 794 Ω, Cu50 is 54. 285 Ω Cu100 Ω 108.571. Room temperature is greater than 20 ℃ when the resistance is bigger, compare the two most of the resistance value judgment. If it's a thermal resistor, you know what the scale is.
It is also possible to find an easily available heat source, which can be judged and identified by heating the temperature measuring element. If hot water of can pick up a cup of water dispenser, the measurement end of temperature measuring element into the hot water, use digital multimeter dc millivolt block, measure it have thermoelectric potential, a thermoelectric potential is thermocouple based on thermoelectric potential thermocouple indexing table lookup, you can judge what is dividing the thermocouple. When there is no thermoelectric potential, it is measured whether there is any change in its resistance value. The measuring end of the heating temperature measuring element of electric soldering iron or electric oven can also be used to judge and identify.