What is a Resistance Thermometer?
A resistance thermometer is a type of temperature sensor. It consists of an element that uses resistance to measure temperature. Often platinum is used for the element which is the reason why they are often called platinum resistance thermometers (PRTs). Other common names include RTDs (short for resistance temperature detector) and depending on the element type Pt100, Pt200, Pt500 or Pt1000.
Pt100 sensors can then be protected in a number of ways and the temperature sensors designed to get the best measurement of your process.