Resistance thermometer THERMASGARD® ASTF ASTF with passive output, terminal box enclosure made of impact-resistant plastic and enclosure cover with quick-locking screws. The radiation sensor is specifically designed for temperature detection in wet areas or in larger rooms ⁄ halls. The on-wall radiation temperature sensor ASTF determines the effective portion of active radiation or the effective radiant heat at the measured location. Due to the measuring method employed by the dark radiation sensor, an excellent measuring result that is representative of the room is achieved.