Gsa-Ps: Intelligent Photoelectric Smoke Detector
Gsa-Ps: Intelligent Photoelectric Smoke Detector
Gsa-Ps: Intelligent Photoelectric Smoke Detector
Intelligent Photoelectric
Smoke Detector
Standard Features
• Integral microprocessor
• Non-volatile memory
• Automatic mapping device
• Electronic addressing
• Environmental compensation
• Intelligent detector
• Wide 0.67% to 3.77%/ft. sensitivity range
• Twenty pre-alarm sensitivity values, set in 5% incre-
ments
• Identification of dirty or defective detectors
• Automatic day/night sensitivity adjustment
• Twin RED/GREEN status LEDs
• Standard, relay, fault isolator, and audible mounting
bases
MEA • Designed and manufactured to ISO 9001 standards
P/N: 18654
Overview
The Signature Series Model GSA-PS Intelligent Photoelectric Smoke Detector gathers analog in-
formation from its smoke sensing element and converts it into digital signals. The detector’s on-
board microprocessor measures and analyzes these signals. It compares the information to histori-
cal readings and time patterns to make an alarm decision. Digital filters remove signal patterns that
are not typical of fires. Unwanted alarms are virtually eliminated.
The microprocessor in each detector provides four additional benefits - Self-diagnostics and History
Log, Automatic Device Mapping, Stand-alone Operation and Fast, Stable Communication.
Self-diagnostics and History Log - Each Signature Series detector constantly runs self-checks to
provide important maintenance information. The results of the self-check are automatically updated
and permanently stored in the detector’s non-volatile memory.
Automatic Device Mapping - The loop controller learns where each device’s serial number ad-
dress is installed relative to other devices on the circuit. The mapping feature provides supervision
of each device’s installed location to prevent a detector from being reinstalled (after cleaning etc.)
in a different location from where it was originally.
Stand-alone Operation - A decentralized alarm decision by the detector is guaranteed. On-board
intelligence permits the detector to operate in stand-alone mode. If loop controller CPU communi-
cations fail for more than four seconds, all devices on that circuit go into stand-alone mode. The
circuit acts like a conventional alarm receiving circuit.
Fast Stable Communication - On-board intelligence means less information needs to be sent
between the detector and the loop controller. Other than regular supervisory polling response, the
detector only needs to communicate with the loop controller when it has something new to report.
DS1036 Revised: 9-Nov-2009 © 2008 Janus Fire Systems. All rights reserved (9/2008) Janus Fire Systems® is a registered trademark of Janus Fire Systems.
Signature Series is a trademark of GE Security.
Installation
Signature Series detectors mount to North American 1-gang boxes, 3-1/2 inch or 4 inch octagon
boxes, 1-1/2 inches (38 mm) deep. They mount to European BESA and 1-gang boxes with 60.3
mm fixing centers.
Application
Although photoelectric detectors have a wide range of fire sensing capabilities they are best suited
for detecting slow, smoldering fires. The table below shows six standard test fires used to rate the
sensitivity of smoke and heat detectors. The table indicates that no single sensing element is suited
for all test fires.
Janus Fire Systems recommends that this detector be installed according to latest recognized edi-
tion of national and local fire alarm codes.
Compatibility
The GSA-PS detectors are compatible only with Signature Loop Controllers.
Standard Base GSA-SB - This is the basic mounting base for Signature Series detectors. The
GSA-LED Remote LED is supported by the Standard Base.
Relay Base GSA-RB - This base includes a relay. Normally open or closed operation is selected
during installation. The dry contact is rated for 1 amp (pilot duty) @ 30 VDC. The relay’s position is
supervised to avoid accidentally jarring it out of position. The GSA-RB can be operated as a control
relay if programmed to do so at the control panel ( V.2 only). The relay base does not support the
GSA-LED Remote LED.
Relay Bases operate as follows:
- at system power-up or reset, the relay is de-energized
- when a detector is installed in the base with the power on, the relay energizes for four seconds,
then de-energizes
- when a detector is removed from a base with the power on, the relay is de-energized
- when the detector enters the alarm state, the relay is energized.
Isolator Base GSA-IB - This base includes a built-in line fault isolator for use on Class A circuits.
A detector must be installed for it to operate. The isolator base does not support the GSA-LED
Remote LED.
The isolator operates as follows:
- a short on the line causes all isolators to open within 23 msec
- at 10 msec intervals, beginning on one side of the Class A circuit nearest the loop controller, the
isolators close to provide the next isolator down the line with power
- when the isolator next to the short closes, reopens within 10 msec.
The process repeats beginning on the other side of the loop controller.
Remote LED GSA-LED - The remote LED connects to the GSA-SB Standard Base only. It features
a North American size 1-gang plastic faceplate with a white finish and red alarm LED.
Ship Wt.
Model P/N Description
lb (kg)
GSA-PS 18654 Intelligent Photoelectric Detector 0.5 (0.2)
Accessories
GSA-SB 18656 Detector Mounting Base 0.2 (0.1)
GSA-RB 18658 Detector Mounting Base w/Relay 0.2 (0.1)
GSA-IB 18657 Detector Mounting Base w/Fault Isolator 0.2 (0.1)
GSA-LED 18883 Remote Alarm LED 0.2 (0.1)
GSA-TS 18659 Trim Skirt (optional) 0.1 (0.05)