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Pt100/Pt1000 are platinum thermal resistors, the resistance value increases with temperature. The common ones are ceramic components, glass components, mica components, etc., which are made by winding platinum wires on the ceramic framework, glass framework, and mica framework respectively, and then processed through complex processes. It is widely used in high-precision temperature equipment such as medical treatment, electrical machinery, industry, temperature calculation, satellite, meteorology, resistance calculation, etc.
Pt100 means that the resistance is 100Ω at 0°C.
Pt1000 means that the resistance is 1000Ω at 0°C.
Pt100/Pt1000 wiring: two-wire, three-wire, and four-wire are common.
Two-wire : the method of connecting a wire at both ends of the thermal resistance to lead out the resistance signal is called the two-wire system: this kind of lead method is very simple, but there must be lead resistance r in the connecting wire, and the size of r depends on the material and length of the wire Factors are related, so this lead method is only suitable for occasions with low measurement accuracy
Three-wire : The method of connecting one lead at one end of the root of the thermal resistance and connecting two leads at the other end is called three-wire system. This method is usually used in conjunction with a bridge, which can better eliminate the influence of lead resistance. It is industrial The most commonly used lead resistance in process control.
Four-wire : The method of connecting two wires at each end of the thermal resistance is called a four-wire system, in which two leads provide constant current I for the thermal resistance, convert R into a voltage signal U, and then pass the other two leads Lead U to the secondary meter. It can be seen that this lead method can completely eliminate the influence of lead resistance and is mainly used for high-precision temperature detection.