Resistance-type Temperature Sensor is also known as resistance temperature detectors (RTDs). A RTD sensing element consists of a wire or etched foil of pure metal. The element¡¯s resistance increases with temperature in a known and repeatable manner. RTDs exhibit excellent accuracy over a wide temperature range and represent the fastest growing segment among industrial temperature sensors. Also, combining  TPS technique with film sensor, this sensor is used for convenient thermal conductivity and thermal diffusivity measurements.

Their advantages:
• Temperature range: -260 to 260¡ãC.
• Repeatability and stability, Ordinary industrial RTDs typically drift less than 0.1¡ãC/year.
• Sensitivity. The voltage drop across an RTD provides a much larger output than a thermocouple.
• Linearity: Platinum and copper RTDs produce a more linear response than thermocouples or thermistors. RTD non-linearities can be corrected through proper design of resistive bridge networks.
• Low system cost: RTDs use ordinary copper extension leads and require no cold junction compensation.
• Standardization: Manufacturers offer RTDs to industry standard curves.

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