SYSTEM SENSOR 2251 Intelligent Photoelectric Smoke Sensor 18/12 and an exhaust tube

and an exhaust tube

The bases accept the F220 Family Photoelectric Smoke and Heat Detector Heads

The Faraday AH-W is a Siemens addressable alarm siren designed for fire detection systems

p/n 500-636078

SYSTEM SENSOR 2251 Intelligent Photoelectric Smoke Sensor 18/12 and an exhaust tubeModel 2251 is a plug in type smoke sensor that combines a photoelectronic sensing chamber with addressable analog communications. The sensor transmits an analog representation of smoke density over a communication line to a control panel. Rotary decade switches are provided for setting the sensors address. Two LEDs on the sensor are controlled by the panel to indicate sensor status. An output is provided for connection to an optional remote LED