Siemens (Pyro) | HI921 - Protegis Fire & Safety Skip to content
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Siemens (Pyro) | HI921

Detector Heat Fixed/ROR

SKU PR-F1D2-2847
$57.99
Availability: Out of stock call for lead time

Siemens HI921 Intelligent Addressable Thermal (Heat) Detector

The Siemens HI921 is an intelligent, addressable thermal (heat) detector designed to provide advanced fire detection through precise temperature monitoring. Incorporating state-of-the-art thermistor technology and microprocessor-based signal processing, the HI921 ensures high reliability and accuracy in various environments. 

Key Features:

Field-Selectable Temperature Settings: Offers seven pre-programmed temperature settings ranging from 135°F (57°C) to 174°F (79°C), including both fixed and rate-of-rise options, allowing customization to specific application requirements. 

Low-Temperature Warning: Capable of providing a warning signal at 40°F (4.4°C), aiding in the prevention of water freezing in sprinkler systems, in compliance with NFPA 72 standards. 

Tri-Color LED Indicator: Equipped with a 360° viewable LED that flashes green for normal operation, yellow for trouble conditions, and red for alarm states, facilitating easy status monitoring.

Built-in ISOtechnology: Features integrated isolation technology to enhance system reliability by isolating short circuits on the signaling line circuit (SLC), supporting True Class-X SLC operation. 

Polarity-Insensitive Wiring: Supports polarity-insensitive wiring configurations, simplifying installation and reducing potential wiring errors.