Ask a question about the wiring of a thermal resistor
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This post was last edited by zyzs on 2011-12-4 08:39. The platinum resistance sensors use a two-wire connection, while the PLC ports use a three-wire connection; is it necessary to use a three-core cable in order to make a proper connection? ? ? ? ? How do I connect?
The thermal resistor is a three-wire type, so of course it has three wires
Thermistors come in two-wire, three-wire, and four-wire types. The resistance of the two-wire cable itself can interfere with the measurement results; in three-wire and four-wire systems, a bridge is used to compensate for the cable resistance, resulting in more accurate measurement outcomes.
Two-wire PT100: In many cases, two-core wires are used to connect directly to the PLC port, and a shorting wire is then used to connect the other port of the PLC to it
The connection cable does not have to be three-core; a two-core cable will also work. Using a three-core cable eliminates the impact of wiring resistance on measurements, resulting in higher accuracy compared to using a two-core cable.
Thermal resistors are generally three-wire types; during wiring, two of the wires are connected together
A three-wire system is more accurate, as it eliminates the influence of wire resistance on the measurement results. It must be a three-core cable.
Just twist the two together, and connect the other one separately
The resistance of three-wire circuits has a significant impact on measurements; 3 ohms corresponds to nearly 10 degrees. This effect is not noticeable at high temperatures, but three-core cables should still be used at low temperatures.
Three-wire wiring is commonly used for thermistor connections.