Data Sheet 85001-0245 -- Intelligent 4D
People detect danger by relating many observations to one another
and comparing them to familiar patterns. The simultaneous use
of multiple senses allow humans to filter out situations which are
not dangerous. The ability to detect danger depends largely on
intelligence and knowledge from past experience. GE Security 4D
detectors provide both.
The SIGA-IPHS Intelligent 4D Multisensor Detector gathers analog
information from each of its three fire sensing elements (ionization, photoelectric, and heat) and converts it into digital signals. The
detector’s on-board microprocessor measures and analyzes these
signals separately with respect to a fourth element - Time. We call
this technology 4D. It compares the information to historical readings, time patterns and several known fire characteristics to make
an alarm decision. Digital filters remove signal patterns that are not
typical of fires. Unwanted alarms are virtually eliminated.
Standard Features
• Integrates three sensing technologies
Processes and analyzes information from each sensor (ion/photo/heat) separately using dynamic filters then applies a sophisticated algorithm for optimum detection accuracy.
• Non-volatile memory
Permanently stores serial number, type of device, and job number. Automatically updates historic information including hours
of operation, last maintenance date, number of alarms and
troubles, time of last alarm1 and analog signal patterns for each
sensing element just before last alarm.
EST Fire & Life Safety
Intelligent Initiating Devices
• Automatic device mapping
Each detector transmits wiring information regarding its location
with respect to other devices on the circuit. Detectors installed in
the wrong location during cleaning are automatically reported to
the loop controller.
• Electronic addressing
Permanently stores programmable address; there are no
switches or dials to set. Addresses are downloaded from a PC, or
the SIGA-PRO Signature Program/Service Tool.
• Environmental compensation
Each sensing element self-compensates for changes in the
detector’s installed environment to maintain the sensitivity setting and prevent unwanted alarms. The detector reports when it
cannot compensate any further.
• Integral microprocessor — Intelligent detector
All decisions are made at the detector allowing lower communication speed while substantially improving control panel
response time. Less sensitive to line noise and loop wiring properties; twisted or shielded wire is not required.
• Wide 0.67 — 3.70%/ft. sensitivity range window
Program the detector to operate at any one of five sensitivity
settings within the window.
• Pre-alarm
Detector stores one of 20 pre-alarm sensitivity values to alert
local personnel prior to the sensor reaching a full evacuation
sensitivity. Sensitivity values can be set in 5% increments.1
Note: Some features described here may not be supported by all
control systems. Check your control panel’s Installation and Operation Guide for details.
Intelligent 4D
Application Notes
Data Sheet 85001-0245 Issue 7
Not to be used for installation purposes. Page of 6
• Identification of dirty or defective detector
Self-diagnostic and sensitivity check provides a dirty detector
• Automatic day/night sensitivity adjustment
Makes detector more sensitive during inactive nighttime periods.
• Stand-alone operation
The detector makes decisions and inputs an alarm even if the
loop controller fails. The detector reverts to an intelligent “conventional” detector when polling interrogation stops.
• Stable design
Sensitivity remains stable with air velocity up to 500 ft/min
(2.53m/sec) making it suitable for direct insertion in low velocity
duct applications.
• Designed for high ambient temperature operation
Install in ambient temperatures up to 100° F (38° C).
• Twin status LEDs
Flashing GREEN shows normal; flashing RED shows alarm state;
steady RED and steady GREEN show alarm state in stand alone
mode, visible from any direction.
• Standard, relay, fault isolator, and audible mounting bases
Four mounting bases provide clamp terminals, allow room side
wiring and include an optional tamper-resist feature.
• Designed to ISO 9001 standards
Manufactured to strict international quality standards for highest reliability.
Signature Series Overview
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. This
information is accessible for review any time at the control panel, PC,
or by using the SIGA-PRO Signature Program/Service Tool.
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.
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. The detector alarms
if the preset smoke obscuration level is reached or ambient temperature increases by 65oF (35oC). 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.
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. This provides very fast control panel
response time and allows a lower baud rate (speed) to be used for
communication on the circuit.
Environmental Compensation - Detection sensitivity for the SIGAIPHS is virtually independent of its installed environment and its
physical condition. Environmental compensation means each sensing element adapts to long-term changes caused by dirt, humidity,
temperature, aging etc. It even compensates for small amounts of
normal ambient smoke. Approximately six times every hour, the
detector adjusts and updates the sensitivity (% obscuration) and
ambient temperature baselines for each sensing element. Signature
Series environmental compenstion is so reliable that it meets NFPA72
field sensitivity testing requirements — without the need for external
Sensitivity Range - The SIGA-IPHS has a sensitivity range or window of 0.67 - 3.70% obscuration per foot. The installer selects the
detector’s ALARM sensitivity level. Five settings ranging from the
least sensitive at 3.5% obscuration/ft to the most sensitive at 1.0%
obscuration/ft are available.
Pre-Alarm - Pre-alarm warnings may alert local staff to a possible
fire condition allowing them to investigate before entering into a full
alarm condition which requires building evacuation. The 4D multisensor’s wide sensitivity range permits the use of early warning
pre-alarm values. The pre-alarm value can be set by the user in 5%
increments, allowing up to 20 pre-alarm settings.
Automatic Day/Night Sensitivity Selection - Signature Series
detectors may be programmed for different sensitivities during day
and night periods. This allows the detector to be more sensitive during unoccupied periods when lower ambient background conditions
are expected.
Stability - The 4D detector’s sensitivity remains stable in wind velocities up to 500 ft/min (2.53 m/sec). Ambient temperature has very
little affect on the detector. The detector 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.
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 Tool.
Data Sheet 85001-0245 Issue 7
Not to be used for installation purposes. Page of 6
With intelligent 4D multisensor detectors, unwanted alarms go
down to nearly zero and the detection of all types of fire increases
to nearly 100%. The European standard DIN EN 54 part 9 describes
six standard test fires used to rate the sensitivity of heat, ionization,
and photoelectric smoke detectors. No single sensing element is
equally suitable for all test fires.
Test Fire
Open Wood
Wood Pyrolysis
Smouldering Cotton
Poly Urethane Foam
Liquid Fire without Smoke
very suitable
very suitable
very suitable
very suitable
Depending on the type of fire expected in a protected space, the
designer usually chooses from three types of sensor technology.
Ionization sensors respond well to fast, flaming fires. Photoelectric
sensors respond well to smoldering fires, and heat sensors are
used as backup or in environmentally poor atmospheres for smoke
detection. Agency requirements demand that ionization sensors
respond to smoldering fires and that photoelectric sensors respond
to flaming fires. This makes single element sensors more prone to
false alarms and slow to respond to fires that are difficult for them
The table below shows that the 4D detector is suited for all applications. Normal detector spacing guidelines should be followed.
SIGA-IPHS detectors are compatible only with GE Security’s Signature Loop Controller.
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
to detect. Only when ALL three fire sensing elements — Ionization,
Photoelectric and Heat — are suitably combined into one detector
can ALL types of fires be effectively detected while virtually eliminating false alarms.
When 4D multisensor detectors are installed, a fire alarm system
does not have to be altered when the application or the type of
“expected” fire changes. The guesswork is removed. The SIGA-IPHS
4D detector is suited for all fire detection applications.
Data Sheet 85001-0245 Issue 7
Not to be used for installation purposes. Page of 6
Typical Wiring
The detector mounting bases accept #18 AWG (0.75mm2), #16 AWG (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 Normally-Open
3 Common
4 DATA IN (-)
5 Not Used
6 Normally-Closed
7 DATA OUT (-)
Term Description
1 Not Used
3 Not Used
4 DATA IN (-)
4 Remote LED (-)
5 Remote LED (+)
6 Not Used
7 DATA OUT (-)
Isolator Detector
Term Description
1 Not Used
3 DATA IN (-)
4 Not Used
5 Not Used
6 DATA OUT (-)
7 Not Used
Audible Detector Base, SIGA-AB4G
Volume setting
Default = Temporal pattern
Cut for steady tone
To configure output volume
or tone, cut the circuit board
as shown.
Data in
From Signature controller or
previous device +
Tone setting
Default = High volume
Cut for low volume
24 Vdc in From power supply or +
previous base
1.0 Amp @ 30 VDC
(Pilot Duty)
24 Vdc out
+ To next base or EOL relay
Data out
+ To next Signature device
Data Sheet 85001-0245 Issue 7
Not to be used for installation purposes. Page of 6
Warnings and Cautions
Testing & Maintenance
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.
Each detector automatically identifies when it is dirty or defective
and causes a “dirty detector” message. The detector’s sensitivity measurement can also be transmitted to the loop controller. A
sensitivity report can be printed to satisfy NFPA sensitivity measurements which must be conducted at the end of the first year and
every two years thereafter.
This detector will NOT sense fires that start in areas where smoke or
heat cannot reach the detector. Smoke or 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 the ionization and photoelectric smoke sensors. The heat sensor by itself does NOT protect
life against fire and smoke.
The user friendly maintenance program shows the current state
of each detector and other pertinent messages. Single detectors
may be turned off temporarily, from the control panel. Availability of
maintenance features is dependent on the fire alarm system used.
Scheduled maintenance (Regular or Selected) for proper detector
operation should be planned to meet the requirements of the Authority Having Jurisdiction (AHJ). Refer to current NFPA 72 and ULC
CAN/ULC 536 standards.
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 4 inch sq. 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.
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.
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.
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
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, it reopens within
10 msec.
The process repeats beginning on the other side of the loop controller.
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. Use black model
Data Sheet 85001-0245 Issue 7
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.
Agency Listings
Ion Sensor
Photo Sensor
Heat Sensor
Storage and Operating
Sensitivity Range
User Selected Alarm
Sensitivity Settings
Pre-alarm Sensitivity
Operating Voltage
Operating Current
Construction & Finish
Compatible Mounting
LED Operation
Address Requirements
UL Listed Spacing
(unipolar) 0.135µC Americium 241
Light Scattering Principle
Alarms at 65ºF (35ºC) above ambient
Air Velocity Range: 0 to 500 ft/min (0 to 2.53 m/s)
Operating Temperature: 32ºF to 100ºF (0ºC to 38ºC)
Storage Temperature: -4ºF to 140ºF (-20ºCto 60ºC)
Humidity: 0 to 93% RH, Non-condensing
Altitude: 6,000 ft. (1828m) above sea level maximum
ULI/ULC - 0.67% to 3.70% obscuration/foot
Most Sensitive: 1.0%/ft. More Sensitive: 2.0%/ft. Normal: 2.5%/ft. Less
Sensitive: 3.0%/ft Least Sensitive: 3.5%/ft.
5% increments, allowing up to 20 pre-alarm settings
15.2 to 19.95 Vdc (19 Vdc nominal)
Quiescent: 45µA @ 19 V Alarm: 45µA @ 19 V Emergency Stand-alone
Alarm Mode: 18mA Pulse Current: 100µA (100 msec)
High-Impact Engineering Polymer - White or Black
SIGA-SB Standard Base, SIGA-RB Relay Base, SIGA-IB Isolator Base, SIGAAB4, AB4G Audible Bases
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
Uses one Device Address
30 ft.
Ordering Information
Ship Wt.
lbs (kg)
Intelligent 4D Multisensor Detector - UL/ULC Listed
Intelligent 4D Multisensor Detector (Black) - UL/ULC Listed
Detector Mounting Base
4 inch Detector Mounting Base c/w SIGA-TS4 Trim Skirt
Detector Mounting Base w/Relay
4 inch Detector Mounting Base w/Relay c/w SIGA-TS4 Trim Skirt
Detector Mounting Base w/Fault Isolator
4 inch Detector Mounting Base w/Fault Isolator c/w SIGA-TS4 Trim Skirt
Remote Alarm LED
Audible (Sounder) Base
Trim Skirt (supplied with 4 inch bases)
Trim Skirt - Black (use with black detector)
Trim Skirt - (optional for non-4” bases)
0.5 (.23)
0.2 (.09)
0.2 (.09)
0.3 (0.15)
0.1 (.04)
Data Sheet 85001-0245 Issue 7
Not to be used for installation purposes. Page of 6
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