DESCRIPTION
The System Sensor 2451 Series photoelectronic smoke de-
tectors are specifically designed to meet the performance re-
quirements of fire detection/alarm systems. The 2451 and
2451T detectors use state-of-the-art optical sensing cham-
bers and are designed so that LED failure will not cause an
alarm. The detectors are designed to provide open area detec-
tion and when installed in a two-wire base are compatible
with FCI fire alarm control panels. The detectors operation
and sensitivity can be tested in place. The Model 2451T unit
has the same specifications as the Model 2451, but also fea-
tures a built-in fixed temperature (135
o
F) thermal detection
unit.
The detectors are of plug-in construction and plug into the
same base as the 1451 series ionization smoke detectors,
making both models interchangeable. Bases are available for
two-wire, four-wire, and 120 VAC four-wire operation.
Two visible LEDs on each detector flash every ten seconds
indicating that power is being applied to the detector. The
LEDs light steadily when the detector is in alarm. A remote
LED annunciator is available as an optional accessory.
The 2451 is UL Listed for mounting inside ducts up to a ve-
locity of 3,000 FPM.
Sensitivity testing is performed either by applying a test
magnet or inserting a calibrated test card according to the test
procedures. Field metering of detector sensitivity may be
performed with the aid of a voltmeter and Test Kit,
MOD 400R.
APPROVALS
TECHNICAL SPECIFICATIONS
Nominal sensitivity
3.0 %/ft.
Operating voltage
8.5 - 35 VDC (24 VDC nominal)
Operating temperature
32
o
to- 120
o
F (0
o
to 49
o
C)
Operating humidity
0 % - 93 % relative humidity
Air velocity
3,000 feet per minute maximum
Construction
Off-white flame retardant plastic
Diameter
6.2 inches (15.7 cm)
Height
3.3 inches (8.2 cm)
Weight
0.5 lb. (277 g)
2451
SYSTEM SENSOR
PHOTOELECTRONIC
SMOKE DETECTOR
9020-0585/Ver. 1.1
16 Southwest Park, Westwood, MA 02090 USA TEL: (781) 471-3000 FAX: (781) 471-3099
FEATURES
·
Easy plug-in of the Head to Base
·
Built-in Tamper-resistant Feature
·
Built-in Test Switch
·
Built-in Visual Alarm Indicators
·
360
o
View Angle Of Alarm LEDs
·
Compatible with FCI Control Panels
·
Field Metering of Detector Sensitivity
·
Removable Insect Screen and Cover
for Field Cleaning
·
Sealed against Dirt, Insects, and
Back Pressure
·
Insect-resistant screening
(.020"/.508 mm openings)
An ISO 9001 Certified Company
