An RTD works by using a basic principle; as the temperature of a metal increases, so does the resistance to the flow of electricity. The electrical resistance is measured in Ohms. The resistance value can then be converted into temperature based on the characteristics of the element. Specifications: RTD Types: PT-100, PT-200, PT-500, PT-1000 Class of Tolerance (Reference DIN EN 60751): 1/3, 1/10, Class B, Class C, Class Y & K Standard RTD MI Probe Sizes: 2, 3, 4.5, 6, 8, 10, 12, 16, 19, 20, 21, 22 mm Configurations: Duplex, Triplex and Multipoint Grade of Protection: IP65, IP67, ATEX, CCOE, Flame ProofType of Termination: IP Rated Head, DIN and explosion- proof connection head,Connectors: MIL STD, Plastic, Ceramic Type of Measurement: Gas, Liquid Immersion, Contact, Surface Sheaths: SS 316, SS 310, SS 446, Inconel 600, Inconel 800, Incoloy Titanium, Inconel, Ceramic, APM (Special Alloys On Request)