Pertronic THD-series Thermistor Heat Detectors are conventional indicating heat detectors with fixed alarm temperature thresholds, for use in NZS 4512-compliant fire systems.
Internal electronics in all THD-series detectors are conformally-coated. The alkaline wash resistant version has wire tail terminations for additional moisture resistance.
Pertronic THD-series Thermistor Heat Detectors are available in two temperature ranges: Blue, 57 °C, and Yellow, 77 °C.
Each detector has a bi-colour indicator LED. When the detector is in the alarm state, the LED glows red. If the detector is wired with incorrect polarity, the LED glows yellow.
Thermistor Heat Detector Alkaline Wash Resistant Blue 57C
Thermistor Heat Detector Alkaline Wash Resistant Yellow 77C