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What is a Resistance Temperature Detector (RTD)?

what is an rtd temperature measurement
As the name implies, they are sensors used to measure temperature by correlating the resistance of the RTD element with temperature. RTD element is made from a pure material which 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)

Wire wound elements RTD
The standard RTD elements used in Ametek’s sensor assemblies are made of 99.99% pure platinum wire wound about a ceramic or glass core and hermetically sealed within a ceramic or glass capsule. 

Thin film RTD
Thin film RTD’s are made up of a thin layer of a base metal embedded into a ceramic substrate and trimmed to produce the desired resistance value. This method allows for the production of small, fast response, accurate sensors.