RTD Temperature Sensors

Resistance Temperature Detectors, or RTDs, are temperature sensors which utilize a material which has a predictable change in resistance as the sensor’s temperature is increased or decreased. RTDs are fragile, so it is placed inside a protective case to protect it. The RTD is further protected from the application and environment by dual wall heat shrink tubing.

Types of RTDs:

2 Wire – Used when high accuracy is not required, resistance of lead wire adds to resistance of the sensor. This configuration allows use of up to 100m of cable.

3 Wire - Used when high accuracy is required, resistance of lead wires cancel and do not add to resistance of the sensor. This configuration allows use of up to 600m of cable.