RTD PT100 - 3 Wire - Support Customization

Name: RTD PT100 - 3 Wire - Support Customization
Brand: Sino-Inst
SKU: RTD PT100 - 3 Wire - Support Customization
Price: 29.00 USD
Availability: InStock

The 3-wire RTD PT100 is the most common of all wiring types used in industrial temperature measurement. Two leads are connected to one end of the thermal resistor temperature sensing element and one lead is connected to the other end. This lead form is called a three-wire system. Many instruments use this connection method, including temperature transmitters, temperature controllers, panel displays, and data loggers.

Our Sino-Inst’s RTD PT100 Temperature Sensor, 3-wire system, supports customization. Includes: temperature range, insertion depth, connection thread, cable length.

RFQ Temperature Sensors

Features

Stainless steel casing package, durable
Support customization of movable threads and fixed threads.
Manufactured in accordance with the international IEC751 international standard, plug and play
A variety of probe sizes are available, with wide adaptability
High precision, high stability and high sensitivity
Small size, economical and practical

RTD PT100 technical parameters

Temperature measurement range:	-200-400℃
Probe diameter:	Φ 6 / φ5mm or customized
Installation method:	fixed / movable screws
Lead length:	generally 2 meters, can be customized length(special lead)
Wiring method:	wiring fork
Sensing device:	PT (platinum)
Probe length:	5cm/10cm/15cm/20cm or customized
Resistance change:	0.3851Ω/℃
Screw specification:	M8*1.0 or customized
Lead connection method:	three-wire
Casing material:	stainless steel

3 Wire RTD PT100 Dimensions and Wiring

Three lead methods for thermal resistors: 2-wire system – 3-wire system – 4-wire system

The method of connecting a wire at both ends of the thermal resistor to draw out the resistance signal is called the two-wire system: This wiring method is very simple, but since the connecting wire must have a lead resistance r, the size of r is related to the material and length of the wire. Therefore, this lead method is only suitable for occasions with low measurement accuracy.

The method of connecting one lead to one end of the root of the thermal resistor and two leads to the other end is called a three-wire system. This method is usually used in conjunction with a bridge, which can better eliminate the influence of lead resistance and is an important part of industrial process control. The most commonly used lead resistors.

The method of connecting two wires at each end of the root of the thermal resistor is called a four-wire system. Two of the leads provide a constant current I for the thermal resistor, convert R into a voltage signal U, and then lead U to Secondary instruments. It can be seen that this lead method can completely eliminate the resistance influence of the lead and is mainly used for high-precision temperature detection.

RTD PT100 - 3 wire custom movable thread — RTD PT100 – 3 wire custom movable thread

Why does PT100 have 3 wires?

The reason why the RTD PT100 uses a three-wire system is to eliminate the measurement error caused by the resistance of the connecting wires.

This is because the circuit used to measure thermal resistance is generally an unbalanced bridge. The thermal resistor is an arm resistor of the electric bridge, and its connecting wire (from the thermal resistor to the central control room) also becomes part of the bridge arm resistor. This portion of resistance is unknown and changes with ambient temperature. causing measurement errors.

Using a three-wire system, connect one wire to the power end of the bridge. The remaining two are connected to the bridge arm where the thermal resistor is located and the bridge arm adjacent to it. This eliminates measurement errors caused by wire line resistance. In industry, the three-wire connection method is generally adopted.