FM Instruments PT-100 Resistance Temperature Detectors (RTDs) are precision temperature sensors designed for accurate and stable temperature measurement in industrial applications. The PT-100 sensor operates on the principle that the electrical resistance of platinum changes proportionally with temperature. The sensing element has a resistance of 100 ohms at 0°C, providing highly accurate and repeatable temperature measurement over a wide range.

Available in various constructions including simplex, duplex, mineral insulated, Thermowell-mounted, and head-mounted types for different industrial applications.