3825 Ohio Avenue • St. Charles, IL 60174

Phone: 800-SENSOR2 • Fax: 630-377-6495

©2006 System Sensor.

Product specifications subject to change without notice. Visit systemsensor.com for

current product information, including the latest version of this data sheet.

A05-0318-006 • 7/06 • #1676

Ordering Information

Model

Thermal

Wiring

Alarm Current

2W-B

No

2-wire

130 mA max. limited by control panel

2WT-B

Yes

2-wire

130 mA max. limited by control panel

4W-B

No

4-wire

20 mA @ 12V, 23mA @ 24V

4WT-B

Yes

4-wire

20 mA @ 12V, 23mA @ 24V

Accessories

2W-MOD2

2-wire loop test / maintenance module

RT

Removal / replacement tool

SENS-RDR

Sensitivity reader

A77-AB2

Retrofit adapter bracket, 6.6 in. (16.76cm) diameter

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

dual color LED indication which 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: 12/24V non-polarized

Minimum: 8.5V

Maximum: 35V

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 @12V, 23mA @ 24V

Peak Standby Current

2-wire: 100 µA; 4-wire: n/a

Alarm Contact Ratings

2-wire: n/a; 4-wire: 0.5 A @ 30V AC/DC

Physical Specifications

Dimensions (including base)

5.3 inches (127 mm) diameter; 2.0 inches (51 mm) height

Weight

6.3 oz. (178 grams)

Operating Temperature Range

2W-B and 4W-B: 32°F–120°F (0°C–49°C); 2WT-B and 4WT-B: 32°F–100°F (0°C–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

14–22 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

Power Up Sequence for LED Indication

LED Mode

Green LED

Red LED

Condition

Duration

Power up

Blink every 10 seconds

Blink every 10 seconds

Initial LED status indication

80 seconds

Normal (standby)

Blink every 5 seconds

off

Out of sensitivity

off

Blink every 5 seconds

Freeze trouble

off

Blink every 10 seconds

Alarm

off

Solid