how does a rtd work
â The RTD measures changes in temperature according to changes in the sensor's resistance. It operates on the principle that electrical resistance of certain metals change in a predictable way-depending on rise or fall in temperature. Sensors can be made from platinum, nickel or copper and eachmetal varies in sensitivity, accuracy and temperature.
An RTD is a device which contains an electrical resistance source (referred to as a. âsensing elementâ or âbulbâ) which changes resistance value depending on itâs. temperature. This change of resistance with temperature can be measured and used to. determine the temperature of a process or of a material. RTD sensing elements come in two basic styles, wire wound and film. Wire wound elements.