Similar to Resistance Temperature Detectors (RTD), the Thermistor (Bulk Semiconductor Sensor) uses resistance to detect temperature. However, unlike an RTD's metal probe where the resistance increases with temperature, the thermistor uses ceramic semiconducting materials which respond inversely with temperature. Examples of thermistors are shown in the following schematic.
Typical thermistor sensors can measure temperatures across the range of -40 ~ 150 ±0.35 °C (-40 ~ 302 ±0.63 °F). The shape of the thermistor probe can take the form of a bead, washer, disk, or rod as illustrated in the above figure. Typical operation resistances are in the kW range, although the actual resistance may range from several MW to several W.