For the detection of temperatures that exist outdoors or in wet room environments, cold storages and greenhouses and in the industrial field. The devices are specially protected against the influence of dust and humidity. The response characteristic of this outdoor sensor is, owing to the externally arranged sensor sleeve, excellent in respect to temperature changes. The active outdoor sensor model AFHM transduces, in a temperature-linear manner, the temperature-dependent resistance of the sensor to a current signal of 4 to 20 mA or to a voltage signal of 0 to 10 V.

In the event the sensor is exposed to direct solar radiation, the use of a special protector is recommended.