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About RTD Temperature Probes

Resistance Temperature Detectors / RTD / RTDs

 

What is a Resistance Temperature Detector? Resistance Temperature Detectors (RTD), as the name implies, are sensors used to measure temperature by correlating the resistance of the RTD element with temperature. Most RTD elements consist of a length of fine coiled wire wrapped around a ceramic or glass core. The element is usually quite fragile, so it is often placed inside a sheathed probe to protect it. The RTD element is made from a pure material whose resistance at various temperatures has been documented. The material has a predictable change in resistance as the temperature changes; it is this predictable change that is used to determine temperature.

Common Resistance Materials for RTDs:

  • Platinum (most popular and accurate)
  • Nickel
  • Copper
  • Balco (rare)
  • Tungsten (rare)
  • Benefits of Using and RTD Probe

    The RTD is one of the most accurate temperature sensors. Not only does it provide good accuracy, it also provides excellent stability and repeatability. Most OMEGA standard RTDs comply with DIN-IEC Class B. The accuracy of an OMEGA standard RTDs is shown in the table on the right.

    RTDs are also relatively immune to electrical noise and therefore well suited for temperature measurement in industrial environments, especially around motors, generators and other high voltage equipment.

     



     

     

     

     

     

     

     

     


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