Pt-100 explosion-protected resistance temperature sensors are used for measuring temperatures in measuring and control engineering. Resistance temperature sensors with Pt-100 sensors are temperature sensors that function based on changes in resistance of platinum under temperature influence. They are used in hazardous areas from –50°C to 440°C. Every sensor has a defined resistance characteristic (factory calibration on request). The Pt-100 sensor is designated by its characteristic at a temperature of 0°C, at which it has a rated resistance of 100 Ohm (Ro = 100 Ohm). This change in resistance is laid down in IEC 60751.
RTDi explosion-protected resistance temperature sensors are installed together with an associated electrical apparatus that is mounted outside the hazardous area or in explosion-protected controls in the type of protection 'Flameproof Enclosure', 'Pressurization' or 'Restricted Breathing'. Provided that the maximum permissible values for the measurement circuit are observed, RTDi explosion-protected resistance temperature sensors in Category 1 may be used in Zones 0 and 20 – and, therefore, also in Zones 1, 2, 21 and 22.