Electronic Heat Detectors, Models THD-7052 and THD-7053

The THD-7052 and THD-7053 are thermistor-based electronic heat detectors with a 135°F (57°C) fixed temperature set point. In addition, the THD-7052 model has a Rate-Of-Rise of temperature detection feature rated at 15°F (8.3°C) per minute. Two Red Light Emitting Diodes are located diametrically opposite each other to allow 360-degree viewing. Both LEDs continuously indicate the operating condition of the Detector. During standby, the LEDs flash once every six seconds. During alarm, both LEDs light steady at full brilliance. A double flash every six seconds indicates a detector with a thermistor trouble. An optional base is available to provide remote LED function. A unique gated output circuit design provides improved stability and transient suppression. Special signal processing techniques verify the presence of smoke before the detector will alarm.