A temperature sensor is an electronic component that measures the temperature and transmits it as an electrical signal to the display, the control unit or the heating system. They do not require an external energy source, they are simply supplied with voltage. The downstream control system measures the resistance of the temperature sensors, which changes according to the ambient temperature. The temperature/resistance ratio can be read off exactly in a comparison table (resistance values).

There are different types of temperature sensors depending on the measuring task and area of application. S+S offers a wide range of passive temperature sensors for measurement technology - from surface-mounted or flush-mounted temperature sensors and passive outdoor temperature sensors to passive cable, room pendulum, duct temperature or passive immersion temperature sensors.