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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. 

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.

Features

• Conventional indicating heat detector with fixed (static) temperature threshold
• Smooth uncluttered design
• Conformally-coated PCB
• Corrosion-resistant materials
• Red LED indication latches ON when an alarm condition is detected
• Remote indicator versions have an output connection for a remote LED indicator (DETREM). The remote indicator latches ON when an alarm condition is detected
• Bi-directional Line In + Line Out terminations
• Terminals on interior versions accept up to 1.5 mm² cable
• Yellow LED indicates reverse polarity connection
• Reverse polarity connection initiates the Defect: High status in Pertronic panels
• In the alarm state, the detector clamps the detection circuit voltage to 2.7 V
• Resistant to false activation caused by vibration or other transient impulses
• Independently tested and certified compliant with NZS 4512:2010