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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 weatherproof 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.