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

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

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

· 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