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.

Additional information

Weight	0.2 lbs
Dimensions	1.93 × 4.13 × 4.13 in
Manufacturer	Siemens Industry, Inc.
Brand	Siemens
Condition	New
Unit of Measurement	EA (Each)
Programming	DPU
Thermal Rating	Programmable
Series	Desigo
Detection Method	Fixed Temperature, Programmable, Rate-of-Rise
Production Status	Active

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