The Intelligent Thermal (Heat) Detector (Model FDT421) provides an advanced method of detection, address programming supervision ─ combined with sophisticated FACP communication. Model FDT421 uses a state-of-the-art thermistor, microprocessor and advanced signal analysis, providing high reliability and accuracy.

Features

• Built-in ISOtechnology
• Compatible with Siemens Model `H’- series devices on the same loop (with Desigo Fire Safety Modular | FireFinder XLS/V | FC/FV20–series fire-alarm control panels
• Contains seven (7) field-selectable settings in a temperature range of 135°F – 174°F (57.2°C – 78.9°C)
• Provides a low-temperature warning of 40°F (4.4°C)
• Field programmable as rate-of-rise or fixed temperature
• Tri-color detector-status light-emitting diode (LED) with 360° view
• Compatible with Model DPU (device programmer / loop tester)
• Utilizes advanced, microprocessor-based signal processing
• Each detector is self-testing:
  • complete diagnostics performed every 10 seconds
• Polarity insensitive via SureWire technology
• Functions with Model DB-11–series mounting bases
• Superior electromagnetic interference (EMI) and radio-frequency interference (RFI) immunity
• Restriction of Hazardous Substances (RoHS compliant)
• UL 521 Listed, ULC Listed; FM (#3230, #3210), CSFM (#7272-0067:0258) Approved