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 1ꢀ5°F
(57.2°C). The detector shall include a mounting base for mounting to ꢀ½-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: ꢀ5V
Maximum Ripple Voltage
Standby Current
ꢀ0% peak to peak of applied voltage
2-wire: 50 µA maximum average; 4-wire: 50 µA maximum average
2-wire: 1ꢀ0 mA limited by control panel; 4-wire: 20 mA @12V, 2ꢀmA @ 24V
2-wire: 100 µA; 4-wire: n/a
Maximum Alarm Current
Peak Standby Current
Alarm Contact Ratings
Physical Specifications
Dimensions (including base)
Weight
2-wire: n/a; 4-wire: 0.5 A @ ꢀ0V AC/DC
5.ꢀ inches (127 mm) diameter; 2.0 inches (51 mm) height
6.ꢀ oz. (178 grams)
Operating Temperature Range
Operating Humidity Range
Thermal Sensor
2W-B and 4W-B: ꢀ2°F–120°F (0°C–49°C); 2WT-B and 4WT-B: ꢀ2°F–100°F (0°C–ꢀ7.8°C)
0 to 95% RH non-condensing
1ꢀ5°F (57.2°C) fixed
Freeze Trouble
2WT-B and 4WT-B only: 41°F (5°C)
2.5%/ft. nominal
Sensitivity
Input Terminals
14–22 AWG
Mounting
ꢀ½-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
off
Initial LED status indication
80 seconds
Normal (standby)
Out of sensitivity
Freeze trouble
Alarm
Blink every 5 seconds
off
off
off
Blink every 5 seconds
Blink every 10 seconds
Solid
Ordering Information
Model
Thermal
Wiring
2-wire
2-wire
4-wire
4-wire
Alarm Current
2W-B
No
1ꢀ0 mA max. limited by control panel
1ꢀ0 mA max. limited by control panel
20 mA @ 12V, 2ꢀmA @ 24V
20 mA @ 12V, 2ꢀmA @ 24V
2WT-B
Yes
4W-B
No
4WT-B
Yes
Accessories
2W-MOD2
SENS-RDR
2-wire loop test / maintenance module
Sensitivity reader
RT
Removal / replacement tool
A77-AB2
Retrofit adapter bracket, 6.6 in. (16.76cm) diameter
©2006 System Sensor.
ꢀ825 Ohio Avenue • St. Charles, IL 60174
Phone: 800-SENSOR2 • Fax: 6ꢀ0-ꢀ77-6495
Product specifications subject to change without notice. Visit systemsensor.com for
current product information, including the latest version of this data sheet.
A05-0ꢀ18-006 • 7/06 • #1676
