Intelligent Heat Detectors
EST Fire & Life Safety
Intelligent Initiating Devices
Standard Features
Signature Series Model SIGA-HFS and SIGA-HRS Intelligent Heat
Detectors gather analog information from their fixed temperature
and/or rate-of-rise heat sensing elements and converts it into digital signals. The detector’s on-board microprocessor measures and
analyzes these signals. It compares the information to historical
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.
Note: Some features described here may not be supported by all
control systems. Check your control panel’s Installation and Operation Guide for details.
The microprocessor in each detector provides four additional benefits - Self-diagnostics and History Log, Automatic Device Mapping,
Stand-alone Operation and Fast, Stable Communication.
• Non-volatile memory
• 70 foot (21.3 meter) spacing
• 15° F (9° C)/min rate-of-rise/135° F (57° C) ft. and 135° F (57 ° C)
fixed temperature type
• Intelligent detector c/w integral microprocessor
• Automatic device mapping
• Electronic addressing
• Identification of defective detectors
• Twin RED/GREEN status LEDs
• Standard, relay, fault isolator, and audible mounting bases
• Designed and manufactured to ISO 9001 standards
Intelligent Heat
Application Notes
Data Sheet 85001-0243 Issue 6
Not to be used for installation purposes. Page of 6
Signature Series Overview
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. This
information is accessible for review any time at the control panel,
PC, or by using the SIGA-PRO Signature Program/Service Tool.
In the unlikely event that an unwanted alarm does take place, the
control panel’s history file can be called up to help isolate the problem and prevent it from happening again.
Installation Spacing - The SIGA-HFS (fixed temperature) and the
SIGA-HRS (fixed temperature/rate-of-rise combination) intelligent
heat detectors are rated for installation at up to 70 foot (21.3 meter)
spacing. These detectors may be installed in rooms with ambient
temperatures up to 100oF (38oC).
Status LEDs - Twin LEDs are visible from any direction. A flashing
GREEN LED shows normal system polling from the loop controller. A
flashing RED LED means the detector is in alarm state. Both LEDs on
steady shows alarm state - stand-alone mode. Normal GREEN LED
activity is not distracting to building occupants, but can be quickly
spotted by a maintenance technician.
Automatic Device Mapping - The loop controller learns where
each device’s serial number address is installed relative to other
devices on the circuit. This 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. The history log for the detector remains relevant and
intact regardless of its new location.
Quality and Reliability - GE Security detectors are manufactured
in North America to strict international ISO 9001 standards. All
electronics utilize surface mount technology (SMT) for smaller size
and greater immunity to RF noise. A conformal coating is used for
humidity and corrosion resistance. All critical contacts are gold
The Signature Series Data Entry Program also uses the mapping
feature. With interactive menus and graphic support, the wired
circuits between each device can be examined. Layout or “as-built”
drawing information showing wire branches (T-taps), device types
and their address are stored on disk for printing hard copy. This
takes the mystery out of the installation. The preparation of as-built
drawings is fast and efficient.
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 communications 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. Each detector on the circuit continues to collect
and analyze information from its surroundings. Both the SIGA-HRS
and SIGA-HFS detectors alarm if the ambient temperature increases
to 135oF (57oC) or for the SIGA-HRS only, the temperature increases
at a rate exceeding 15oF (9oC)/minute. If the detector is mounted
to a relay base, the relay operates. Similarly, if it is mounted to an
audible base, the on-board horn sounds.
Signature Series detectors mount to North American 1-gang boxes,
3-1/2 inch or 4 inch octagon boxes, and to 4 inch square electrical
boxes 1-1/2 inches (38 mm) deep. They mount to European BESA
and 1-gang boxes with 60.3 mm fixing centers.
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 control panel when it
has something new to report. This provides very fast control panel
response time and allows a lower baud rate (speed) to be used for
communication on the circuit. The lower baud rate offers several
advantages including:
- less sensitivity to circuit wire characteristics
- less sensitivity to noise glitches on the cable
- less emitted noise from the data wiring
- twisted or shielded wiring is not required
Electronic Addressing - The loop controller electronically addresses
each detector, saving valuable time during system commissioning.
Setting complicated switches or dials is not required. Each detector
has its own unique serial number stored in its on-board memory.
The loop controller identifies each device on the circuit and assigns
a “soft” address to that device’s serial number. If desired, detectors
can be addressed using the SIGA-PRO Signature Program/Service
Data Sheet 85001-0243 Issue 6
Not to be used for installation purposes. Page of 6
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.
GE Security recommends that this detector be installed according to latest recognized edition of national and local fire alarm codes.
Test Fire
Open Wood
Wood Pyrolysis
Smouldering Cotton
Poly Urethane Foam
Liquid Fire without Smoke
very suitable
very suitable
very suitable
very suitable
SIGA-HRS and SIGAHFS Rate-of-Rise/
Fixed Temp.
very suitable
Photo Heat 3D
very suitable
very suitable
very suitable
Ion/Photo/Heat 4D
very suitable
Typical Wiring
The detector mounting bases will accept #18 AWG (0.75mm2), #16 (1.0mm2), #14 AWG (1.5mm2), and #12 AWG (2.5mm²) wire sizes.
Note: Sizes #16 AWG (1.0mm2) and #18 AWG (0.75mm2) are preferred for ease of installation. See Signature Loop Controller catalog
sheet for detailed wiring requirement specifications.
Standard Detector Base, SIGA-SB, SIGA-SB4
Relay Detector Base, SIGA-RB, SIGA-RB4
Term Description
1 Not Used
3 Not Used
4 DATA IN (-)
4 Remote LED (-)
5 Remote LED (+)
6 Not Used
7 DATA OUT (-)
Term Description
1 Normally-Open
3 Common
4 DATA IN (-)
5 Not Used
6 Normally-Closed
7 DATA OUT (-)
Isolator Detector Base, SIGA-IB, SIGA-IB4
Term Description
1 Not Used
3 DATA IN (-)
4 Not Used
5 Not Used
6 DATA OUT (-)
7 Not Used
1.0 Amp @ 30 VDC
(Pilot Duty)
Audible Detector Base, SIGA-AB4G
Volume setting
Tone setting
Default = High volume
Cut for low volume
Default = Temporal pattern
Cut for steady tone
To configure output volume
or tone, cut the circuit board
as shown.
24 Vdc in From power supply or +
previous base
Data in
From Signature controller or
previous device +
24 Vdc out
+ To next base or EOL relay
Data out
+ To next Signature device
Data Sheet 85001-0243 Issue 6
Not to be used for installation purposes. Page of 6
All detector mounting bases have wiring terminals that are accessible from the “room-side” after mounting the base to the electrical
box. The bases mount to North American 1-gang boxes and to 3½
inch or 4 inch octagon boxes, 1½ inches (38 mm) deep. They also
mount to European BESA and 1-gang boxes with 60.3 mm fixing
centers. The SIGA-SB4, SIGA-RB4, and SIGA-IB4 mount to North
American four inch square electrical boxes in addition to the above
boxes. They include the SIGA-TS4 Trim Skirt which is used to cover
the “mounting ears” on the base. The SIGA-AB4G mounts to a 4”
sqare box only.
Isolator Base SIGA-IB, SIGA-IB4 - 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 SIGA-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
- if the isolator next to the short closes, it reopens within 10 msec.
The process repeats beginning on the other side of the loop controller.
Audible Base
Standard Base
Isolator Base
Relay Base
Remote LED
Standard Base SIGA-SB, SIGA-SB4 - This is the basic mounting base
for GE Security Signature Series detectors. The SIGA-LED Remote
LED is supported by the Standard Base.
Relay Base SIGA-RB, SIGA-RB4 - 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 SIGA-RB can be operated as a control relay if programmed to
do so at the control panel (EST3 V. 2 only). The relay base does not
support the SIGA-LED Remote LED.
Audible Base SIGA-AB4G - This base is designed for use where
localized or group alarm signaling is required. When the detector
senses an alarm condition, the audible base emits a local alarm
signal. The optional SIGA-CRR Polarity Reversal Relay can be used
for sounding to other audible bases on the same 24 Vdc circuit.
Relay and Audible 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.
Remote LED SIGA-LED - The remote LED connects to the SIGA-SB
or SIGA-SB4 Standard Base only. It features a North American size
1-gang plastic faceplate with a white finish and red alarm LED.
SIGA-TS4 Trim Skirt - Supplied with 4 inch bases, it can also be
ordered separately to use with the other bases to help hide surface
imperfections not covered by the smaller bases.
Warnings & Cautions
This detector will not operate without electrical power. As fires frequently cause power interruption, we suggest you discuss further
safeguards with your fire protection specialist.
This detector will NOT sense fires that start in areas where heat cannot
reach the detector. Heat from fires in walls, roofs, or on the opposite
side of closed doors may not reach the detector to alarm it.
The heat sensor in this device only provides a source of information to supplement the information provided by photoelectric or
ionization smoke detectors which may be located nearby. The heat
detector by itself does NOT provide life safety protection. Under no
circumstances should heat detectors be relied on as the sole means
of fire protection.
The SIGA-HFS and SIGA-HRS detectors are compatible only with GE
Security’s Signature Loop Controller.
Data Sheet 85001-0243 Issue 6
Not to be used for installation purposes. Page of 6
Catalog Number
Heat Sensing Element
Fixed & Temperature/ Rate-of-Rise
Fixed Temperature
Alarm Point
Alarms at 135ºF (57ºC) Ambient
Alarms at 135ºF (57ºC) Ambient or Temp. increase
above 15ºF (9ºC) per min.
UL Listed Detector Spacing
70 feet (21.3 meters) center to center spacing
Operating and Storage Environment
Operating Temp: 32ºF to 100ºF (0ºC to 38ºC) Storage Temp: -4ºF to 140ºF (-20ºC to 60ºC) Humidity: 0 to 93% RH,
15.2 to 19.95 Vdc (19 Vdc nominal)
Operating Voltage
Construction & Finish
Quiescent: 45µA @ 19 V Alarm: 45µA @ 19V Emergency Stand-alone Alarm Mode: 18mA Pulse Current: 100 µA
(100 msec)
High Impact Engineering Polymer - White
Compatible Mounting Bases
SIGA-SB Standard Base, SIGA-RB Relay Base, SIGA-IB Isolator Base, SIGA-AB4, SIGA-AB4G Audible Bases
LED Operation
On-board Green LED - Flashes when polled On-board Red LED - Flashes when in alarm; Both LEDs - Glow steady
when in alarm (stand-alone) Compatible Remote Red LED (model SIGA-LED) Flashes when in alarm
Use With: SIGNATURE Loop Controller
Address Requirements
Uses one device address
Agency Listings
Operating Current
Ordering Information
Catalog Number
Intelligent Fixed Temperature Heat Detector - UL/ULC Listed
Intelligent Fixed Temperature/Rate-of-Rise Heat Detector - UL/ULC Listed
Detector Mounting Base
4-inch Detector Mounting Base c/w SIGA-TS Trim Skirt
Detector Mounting Base w/Relay
4-inch Detector Mounting Base /w Relay c/w SIGA-TS Trim Skirt
Detector Mounting Base w/Fault Isolator
4-inch Detector Mounting Base w/ Fault Isolator c/w SIGA-TS Trim Skirt
Remote Alarm LED
Audible (Sounder) Base
Trim Skirt (supplied with 4-inch bases)
Ship Wt. lbs (kg)
0.5 (0.23)
0.2 (.09)
0.3 (0.15)
0.1 (.04)
Data Sheet 85001-0243 Issue 6
Not to be used for installation purposes. Page of 6
T 888-378-2329
F 866-503-3996
T 519 376 2430
F 519 376 7258
T 852 2907 8108
F 852 2142 5063
T 61 3 9259 4700
F 61 3 9259 4799
T 32 2 725 11 20
F 32 2 721 86 13
Latin America
T 305 593 4301
F 305 593 4300
© 2006 General Electric Company
All Rights Reserved
Signature Series is a Trademark
of GE Security.
Data Sheet 85001-0243 Issue 6
Not to be used for installation purposes. Page of 6
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