PT100/RTD Sensors- Probes

RTD (Resistance Temperature Detectors)

The use of RTD/PT100 is to measure temperatures that require improved accuracy over what a thermocouple could offer. Typically connected to temperature controllers, they transmitters with 2 or 3 wires options. The third wire reduces the error from the leads and provides higher accuracy.

Advantages

• More accurate than thermocouples
• Stability
• More linear than thermocouples

Disadvantages

• Power supply required
• Higher costs than thermocouples
• Low resistance value
• Self-heating