EMERSON
Measurement Instrumentation

Resistance Temperature Detector

Explore Resistance Temperature Detectors (RTDs) are precision temperature sensors that use the resistance of platinum, nickel, or copper to measure temperature. They are preferred for applications requiring accurate and stable measurements over a range of -200°C to 600°C, such as in laboratories and industrial processes.

Products

Frequently Asked Questions

These refer to the tolerance levels defined by IEC 60751:

  • Class A: ±(0.15 + 0.002 × |t|) °C
  • Class B: ±(0.30 + 0.005 × |t|) °C 

Class A is more precise than Class B.

CVD (Callendar–Van Dusen) coefficients describe the unique resistance-temperature relationship of an individually calibrated RTD. When used in transmitters, they improve accuracy significantly - often beyond standard Class A and B tolerances.

They can be, but shielded cables, twisted pairs, and proper grounding can minimize EMI. Emerson’s Rosemount Temperature Transmitters use isolated outputs to help reduce noise and minimize EMI.