RTD WIRING OPTIONS



  • 2
    2 Wire

    Using the 2-wire method, the two wires that provide the RTD with its excitation current and the two wires across which the RTD voltage is measured are the same.

  • 3
    3 Wire

    In a three wire RTD one of the wires is connected to one side of the temperature element and the remaining two wires are connected to the other side of the element.

  • 4
    4 Wire

    The optimum form of connection for RTDs is a four-wire circuit. It removes the error caused by mismatched resistance of the lead wires.

  • RTD TOLERANCES PER IEC 751

  • A
    Class A

    ±(0.15 + 0.002*t)°C or 100.00 ±0.06 Ω at 0ºC

  • B
    Class B

    ±(0.3 + 0.005*t)°C or 100.00 ±0.12 Ω at 0ºC

  • 1/3
    1/3 Din

    ±1⁄3* (0.3 + 0.005*t)°C or 100.00 ±0.10 Ω at 0ºC

  • 1/10
    1/10 Din

    ± 1⁄10* (0.3 + 0.005*t)°C or 100.00 ±0.03 Ω at 0ºC

  • RTD RESISTANCE VALUES

  • 100
    100 Ohm

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  • 1000
    1000 ohm

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  • 120
    120 Ohm

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  • 500
    500 Ohm

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Testimonials

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Alan Smith

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John Franklin

What is a Resistance Temperature

Detector (RTD)?

An RTD (resistance temperature detector) is a temperature sensor that operates on the measurement principle that a material’s electrical resistance changes with temperature.

The relationship between an RTD’s resistance and the surrounding temperature is highly predictable, allowing for accurate and consistent temperature measurement. By supplying an RTD with a constant current and measuring the resulting voltage drop across the resistor, the RTD’s resistance can be calculated, and the temperature can be determined.

By supplying an RTD with a constant current and measuring the resulting voltage drop across the resistor, the RTD’s resistance can be calculated, and the temperature can be determined.

Why use an RTD instead of a thermocouple or thermistor sensor?


Each type of temperature sensor has a particular set of conditions for which it is best suited. RTDs offer several advantages:

  • 1. • A wide temperature range -200°C to +1000°C

  • 2. Good accuracy (better than thermocouples)

  • 3. Good interchangeability

  • 4. Long-term stability

  • With a temperature range up to 1000°C, RTDs can be used in all but the highest-temperature industrial processes. When made using metals such as platinum, they are very stable and are not affected by corrosion or oxidation.

    RTD Sensor Configurations

    • General Thermocouple

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    • Thermocouple with Plug

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    • Bayonet Thermocouple

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    • Jessica Priston

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    • Patrick Pool

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    • Patrick Pool

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    • General Thermocouple

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    • Thermocouple with Plug

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    • Bayonet Thermocouple

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    • Jessica Priston

      Phasellus blandit magna sed libero vene natis venenatis feugiat massa rhoncus.

    • Patrick Pool

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    • Patrick Pool

      Morbi egestas ligula et erat blandit, etiam felis lectus, consectetur vel fringilla.