Thermal Resistance Temperature Sensor Operation The thermal resistance is a primary component that converts temperature changes to changes in resistance. It is usually necessary to pass the resistance signal through a lead wire to a computer control device or other primary meter. Industrial thermal resistance is installed at the production site and there is a certain distance between it and the control room. Therefore, the wire of the thermal resistance will have a greater impact on the measurement results.
There are three main ways of GB thermal resistance: 1 two-wire system: the two ends of the thermal resistance connected to a wire to lead out the resistance signal is called two-wire system: This lead wire method is very simple, but there must be lead wire resistance due to the connection wire. The size of r is related to the material of the wire and the length of the wire, so this lead wire method is only suitable for occasions with low measurement accuracy.
2 three-wire system: In the root of the thermal resistor connected to one end of the lead, the other end connected to the two lead wire called three wire system, this method is usually used in conjunction with the bridge, can better eliminate the impact of lead resistance, is The most commonly used in industrial process control.
3 four-wire system: in the root of the thermal resistance of the two ends of the connection of two wires called four-wire system, in which two leads for the thermal resistance to provide a constant current I, R into a voltage signal U, and then through the other two The lead leads U to the secondary meter. It can be seen that this lead wire method can completely eliminate the influence of the resistance of the wire, and is mainly used for high-precision temperature detection.
Thermal resistance adopts three-wire connection method. The three-wire system is used to eliminate the measurement error caused by the connection wire resistance. This is because the circuit for measuring the thermal resistance is generally an unbalanced bridge. The thermal resistance acts as a bridge arm resistor of the bridge, and its connection wire (from the thermal resistance to the central control room) also becomes a part of the bridge arm resistance. This part of the resistance is unknown and varies with the ambient temperature, causing measurement errors. Using a three-wire system, one wire is connected to the power supply terminal of the bridge, and the other two are respectively connected to the bridge arm where the thermal resistor is located and the adjacent bridge arm, which eliminates the measurement error caused by the wire line resistance.
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