Siemens HI921

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.
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.