2451
SYSTEM SENSOR
PHOTOELECTRONIC
SMOKE DETECTOR
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.
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APPROVALS
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)
TECHNICAL SPECIFICATIONS
Nominal sensitivity
Operating voltage
Operating temperature
Operating humidity
Air velocity
Construction
Diameter
Height
Weight
3.0 %/ft.
8.5 - 35 VDC (24 VDC nominal)
32
o
to- 120
o
F (0
o
to 49
o
C)
0 % - 93 % relative humidity
3,000 feet per minute maximum
Off-white flame retardant plastic
6.2 inches (15.7 cm)
3.3 inches (8.2 cm)
0.5 lb. (277 g)
16 Southwest Park, Westwood, MA 02090 USA TEL: (781) 471-3000 FAX: (781) 471-3099
An ISO 9001 Certified Company
9020-0585/Ver. 1.1
MOUNTING
·
On a 4-inch square box with or without
plaster ring or supplied adapter. Minimum
depth 1.5 inches.
·
On a 3 1/2 or 4-inch octagonal box. Minimum
depth 1.5 inches.
·
On a single gang box. Min. depth 1.5 inches.
VIEWS SHOWING POSITION OF TEST MAGNET
INSTALLATION
Place the detector into the detector base. Turn the de-
tector clockwise until the detector locks into place.
To use the tamper-proof feature, break the smaller tab
on the scribed line in the tamper proof tab located on the
detector mounting bracket. Install the detector. To re-
move the detector from the base when using the tam-
per-proof feature, insert the blade of a small
screwdriver into the hole on the side of the base and
push the plastic lever away from the detector head. This
will allow the detector to be rotated counterclockwise
for removal.
NOTE:
The decorative ring must be re-
moved in order to remove the head when using the tam-
per-proof feature.
The tamper-proof feature may be defeated perma-
nently by breaking the plastic lever off the base.
NOTE:
The number of two-wire smoke detectors
which can be accommodated per zone varies with dif-
ferent control panels.
Consult the control panel in-
struction manual to determine the capacity.
Refer to NFPA 72, Chapter 5-3 “Smoke Sensing Fire
Detectors” for spacing, location of detectors and other
guidelines.
WARNING:
To prevent detector contamination
during construction, smoke detectors must be
protected from dust and contamination until area
is clean and dust free. See NFPA 72-5-3.7.1.3.
·
Field metering of detector sensitivity may be
performed with the aid of a voltmeter and Test
Kit MOD 400R.
For the complete procedure, refer to the Installation
and Maintenance instructions furnished with each de-
tector.
TESTING
Detectors may be tested in the following ways:
·
Place a test magnet against the cover opposite
the test module socket (See illustration above).
The detector should go into alarm within 5 sec-
onds.
·
A test card with one end marked “ALARM”
and the other end marked “NO ALARM” is fur-
nished with each unit. For the complete proce-
dure, refer to the Installation and Maintenance
instructions furnished with each detector.
MAINTENANCE
Cleaning programs should be adapted to the individ-
ual environment in conformance with NFPA Standard
72. We recommend, at the least, an annual cleaning of
the unit. The detector screen and cover assembly can be
removed, revealing the sensing chamber. A vacuum
cleaner can be used to remove dust from the screen,
cover and sensing chamber. For the complete proce-
dure, refer to the Installation and Maintenance instruc-
tions furnished with each detector.
Description
Photoelectronic Detector
Photo. Detector w/135
o
F thermal
Base, two-wire
Base, four-wire, 24 VDC operation
Base, four-wire, 120 VAC operation
Remote Alarm Indicator
End of Line Relay, 24 VDC
Test Kit
ORDERING AND TECHNICAL INFORMATION
Part No.
Model
2451
2451T
B401B
B402B
301B4AC
RA-400
PAM-1
Supv.
Current
——
——
.00012 A
.00012 A
Alarm
Current
‡
‡
‡
.036 A
.007 A
.015 A
Contacts
——
——
——
Form A, C*
Form A, C* & Supv.
Form B
Form A - 2.0 A. @ 30 VAC/DC
Form C - 2.0 A. @ 30 VAC/DC, 1.0A. @ 120 VAC
‡NOTE:
Alarm current of detector is limited by control panel initiating device circuit.
Specifications are provided for information only, are not intended to be used for installation purposes, and are believed to be accurate. However, no responsibility is assumed by Fire Control
Instruments, Inc. for their use. Specifications subject to change without notice.
©
2003 All Rights Reserved
* Resistive load (contact ratings):
2 of 2
9020-0585
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