What is the nominal resistance for platinum temperature sensors?

The nominal resistance for temperature sensors is the resistance value that the sensor has at a specified reference temperature. For platinum resistance thermometers (e.g. Pt100 with 100 Ω or Pt1000 with 1000 Ω at 0 °C), 0 °C is always used as the reference, while for NTC sensors, the nominal resistance is usually specified at 25 °C (e.g. 10 kΩ NTC). The nominal resistance thus serves as a unique identifier for the sensor type and as a starting point for converting resistance into temperature.