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How to wire the temperature sensor terminal box

Proper wiring of a temperature sensor terminal box ensures accurate temperature readings and reliable signal transmission to your control system.General Wiring Principles

When wiring a temperature sensor to a terminal box or transmitter, the main goal is to connect the sensor correctly while maintaining signal integrity. This involves:

  • Connecting the sensor leads to the input terminals of the terminal box or transmitter.
  • Completing the current loop for 4–20 mA transmitters by connecting the power supply and load (PLC or DCS input) in series with the transmitter output .
  • Observing polarity: Thermocouple wires must match the positive (+) and negative (-) terminals to avoid reversed readings .
  • Using proper extension wires: Thermocouple extension wires should match the sensor type to maintain accuracy .
RTD Sensor Wiring Configurations

RTD sensors (commonly Pt100) can be wired in 2-wire, 3-wire, or 4-wire configurations, each with different accuracy levels:

  • 2-Wire RTD: Simplest, but includes lead resistance in the measurement, suitable only for short cable runs .
  • 3-Wire RTD: Most common in industrial applications; allows the transmitter to compensate for lead resistance, improving accuracy .
  • 4-Wire RTD: Provides the highest accuracy by using separate wires for power and signal measurement, eliminating lead resistance errors. Best for short runs (
How to wire the temperature sensor terminal box

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