System Sensor i3 series 2w-b, 2wt-b, 4w-b, 4wt-b Data Sheet

Photoelectric
Smoke Detectors
System Sensor i3™ series smoke detectors represent
significant advancement in conventional detection.
The i3 family is founded on three principles: installation
ease, intelligence, and instant inspection.

Features
• Plug-in detector line, mounting base included
• Large wire entry port
• In-line terminals with SEMS screws
• Mounts to octagonal and single-gang back boxes, 4-square back
boxes, or direct to ceiling
• Stop-Drop ’N Lock attachment to base

Intelligence. i3 detectors offer a number of intelligent features
to simplify testing and maintenance. Drift compensation and
smoothing algorithms are standard with the i3 line to minimize
nuisance alarms. 2-wire i3 detectors can generate a remote LEDindicated maintenance signal when connected to the 2W-MOD2
loop test/maintenance module or a panel equipped with the i3
protocol. The SENS-RDR, a wireless device, displays the sensitivityof i3
detectors in terms of percent-per-foot obscuration.

• Removable detector cover and chamber
• Built-in remote maintenance signaling
• Drift compensation and smoothing algorithms
• Simplified sensitivity measurement
• Wide-angle, dual-color LED indication
• Loop testing via EZ Walk feature

Instant inspection. The i3 series provides wide-angle red and
green LED indicators for instant inspection of the detector’s
condition: normal standby, out-of-sensitivity, alarm, or freeze trouble.
When connected to the 2W-MOD2 loop test/maintenance module
or a panel with the i3 protocol, the EZ Walk loop test feature is
available on 2-wire i3 detectors. This feature verifies the initiating loop
wiring by providing LED status indication at each detector.

• Built-in test switch

Agency Listings

S911

3011446

Installation ease. The i3 line redefines installation ease with its
plug-in design. This allows an installer to pre-wire bases (included
with heads). The large wire entry port and in-line terminals provide
ample room for neatly routing the wiring inside the base. The base
accommodates a variety of back box mounting methods as well as
direct mounting with drywall anchors. To complete the installation, i3
heads plug into the base with a simple Stop-Drop ’N Lock™ action.

7272-1653:152

290-01-E

2093

3180932

Smoke Detector Specifications
Architectural/Engineering Specifications
Smoke detector shall be a System Sensor i3 Series model number_______, listed to Underwriters Laboratories UL 268 for Fire Protection Signaling Systems. The
detector shall be a photoelectric type (Model 2W-B, 4W-B) or a combination photoelectric/thermal (Model 2WT-B, 4WT-B) with thermal sensor rated at 135°F
(57.2°C). The detector shall include a mounting base for mounting to 3½-inch and 4-inch octagonal, single-gang, and 4-inch square back boxes with a plaster
ring, or direct mount to the ceiling using drywall anchors. Wiring connections shall be made by means of SEMS screws. The detector shall allow pre-wiring of the
base and the head shall be a plug-in type. The detector shall have a nominal sensitivity of 2.5 percent-per-foot nominal as measured in the UL smoke box. The
detector shall be capable of automatically adjusting its sensitivity by means of drift compensation and smoothing algorithms. The detector shall provide dualcolor LED indication that blinks to indicate power up, normal standby, out of sensitivity, alarm, and freeze trouble (Model 2WT-B, 4WT-B) conditions. When used
in conjunction with the 2W-MOD2 module, 2-wire models shall include a maintenance signal to indicate the need for maintenance at the alarm control panel
and shall provide a loop testing capability to verify the circuit without testing each detector individually.
Electrical Specifications
Operating Voltage
Nominal: 12/24 V non-polarized
Minimum: 8.5 V
Maximum: 35 V
Maximum Ripple Voltage
30% peak to peak of applied voltage
Standby Current
2-wire: 50 µA maximum average; 4-wire: 50 µA maximum average
Maximum Alarm Current
2-wire: 130 mA limited by control panel; 4-wire: 20 mA @12 V, 23 mA @ 24 V
Peak Standby Current
2-wire: 100 µA; 4-wire: n/a
Alarm Contact Ratings
2-wire: n/a; 4-wire: 0.5 A @ 30 V AC/DC
Physical Specifications
Dimensions (including base)
5.3 inches (127 mm) diameter; 2.0 inches (51 mm) height
Weight
6.3 oz (178 g)
Operating Temperature Range
2W-B and 4W-B: 32°F to 120°F (0°C to 49°C); 2WT-B and 4WT-B: 32°F to 100°F (0°C to 37.8°C)
Operating Humidity Range
0 to 95% RH non-condensing
Thermal Sensor
135°F (57.2°C) fixed
Freeze Trouble
2WT-B and 4WT-B only: 41°F (5°C)
Sensitivity
2.5%/ft nominal
Input Terminals
14 to 22 AWG
Mounting
3½-inch octagonal back box
4-inch octagonal back box
Single-gang back box
4-inch square back box with a plaster ring
Direct mount to ceiling
LED Modes
LED Mode
Power up
Normal (standby)
Out of sensitivity
Freeze trouble
Alarm

Green LED
Blink every 10 seconds
Blink every 5 seconds
off
off
off

Power-Up Sequence for LED Indication
Condition
Initial LED status indication

Red LED
Blink every 10 seconds
off
Blink every 5 seconds
Blink every 10 seconds
Solid

Duration
80 seconds

Ordering Information
Model
2W-B
2WT-B
4W-B
4WT-B
Accessories
2W-MOD2
SENS-RDR

Thermal
No
Yes
No
Yes

Wiring
2-wire
2-wire
4-wire
4-wire

2-wire loop test / maintenance module
Sensitivity reader

Alarm Current
130 mA max. limited by control panel
130 mA max. limited by control panel
20 mA @ 12 V, 23 mA @ 24 V
20 mA @ 12 V, 23 mA @ 24 V
RT
A77-AB2

3825 Ohio Avenue • St. Charles, IL 60174
Phone: 800-SENSOR2 • Fax: 630-377-6495

Removal / replacement tool
Retrofit adapter bracket, 6.6 inch (16.76 cm) diameter

©2009 System Sensor.
Product specifications subject to change without notice. Visit systemsensor.com for
current product information, including the latest version of this data sheet.
A05-0318-007 • 6/09 • #2169