Industrial resistance temperature detectors are mainly divided into platinum RTDs and copper RTDs.
RTDs measure temperature based on the property that the electrical resistance of a material changes with temperature. The sensing element is made of fine metal wires uniformly wound on an insulating support frame. When a temperature gradient exists in the measured medium, the measured temperature represents the average temperature of the medium surrounding the sensing element.
The assembled RTD mainly consists of a terminal box, protection tube, terminals, insulating sleeve, and sensing element, together with various mounting and fixing accessories.