7351J Very Intelligent Early Warning (VIEW) Laser Smoke Detector Technical Bulletin
3
The 7351J is a plug-in type smoke sensor that has a laser-based
photoelectronic sensing chamber. Using FlashScan® communication
protocol on the Signaling Line Circuit (SLC), the sensor uses
analog-addressable communications to transmit smoke density and other
information to the central panel.
The use of a laser diode provides substantial improvements in
signal-to-noise ratio compared to a traditional Light-Emitting Diode
(LED) light source. The sensor transmits an analog representation of
smoke density over a multiplexed SLC to the Intelligent Fire Controller
(IFC) control panel. Rotary switches are provided for setting the IFC
panel’s SLC sensor address (1-159).
The sensor has two multicolored LEDs controlled by the panel to indicate
sensor status. Flashing green indicates normal operation and steady red
indicates alarm, pre-alarm, or trouble.
An output is provided for connection to an optional remote LED alarm
annunciator (Model RA400Z).
Mirror Detail
lpx751_1
Mirror
(See detail at right.)
Test LED
Smoke
Direction Baffles
Sensing Chamber
Laser Beam
Light Trap
Photo Receiver
Laser Diode and
Intergral Lens
Assembly
Figure 1: Inside the 7351J
General
Description
