A resistance temperature detector(RTD) is a temperature measuring device made of materials such as platinum whose resistance change is known at different temperatures. The R v/s T curve is used to determine the temperature. The platinum RTD’s are the most stable, linear and accurate among all the RTD’s The Common material used to make RTD’s are
- Provide good stability and repeatability
- RTD’s 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 equipments.
- The resistance changes linearly with temperature so the measurement is quite simple.
- Lower temperature measuring range
- High cost
- The RTD’s are not well suited to use in harsh environments compared to thermocouple.
Original Source: https://sensors-actuators-info.blogspot.com/2009/08/rtd.html