... Modes -- ROR, Fixed Temperature HEIMAN Fire Alarm Products4 Wire Conventional Heat Detector --- HM-203HC-4Power Supply Non-Polar Input Low Standby Current ... ~ +50 °C , Humidity ≤ 95%RHTemp. Trip Point57°C (135°F) Rate-Of-Rise8°C (15°F)/MinDetecting Range50m² at 6-12m Installation ... ) Direct control on material, testing, quality, leadtime etc. Fire Alarm Heat Detector (Rate-Of-Rise, Fixed Temperature)