Model

2451 with B404B/B404BT

and RTC Remote Test Kit

Product Overview

Low standby current

Two LEDs “blink” in standby

Detector head plugs easily into base

Field adjustable sensitivity

Built-in test switch

Field sensitivity metering of detector to meet

the requirements of NFPA 72

120VAC and 24VAC/DC bases with built-in

shorting spring

Built-in tamper-resistant feature

Designed for mounting on standard electrical box

SEMS screws for easy wiring and positive wire

retention

Removable cover and insect screen for field

cleaning

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Duct Smoke

Detector for Special

Applications

UL 268A

(Requires RTC

accessory)

2451 with B404BT and RTC

(Includes the RTS451)

The System Sensor 2451 photoelectronic smoke detector is UL listed

to UL 268A specifically for use in no-flow/low-flow air-handling sys-

tems. It’s designed for installations where a standard Venturi principle

duct smoke detector is unsuitable. This is the perfect combination for

installation in ducts where the air velocity is below 500 fpm or for duct

sizes as small as 8 inches in diameter. Pendant mounted in a standard

electrical box within the duct, the twist-in/twist-out head allows easy

removal from the base for quick cleaning and maintenance. The detec-

tor can be combined with the System Sensor B404B 120VAC base or

the B404BT 24VAC/DC base. Remote testing is accomplished using our

Remote Test Coil accessory that includes the RTS451. The APA451,

Remote Annunciator with Piezo Alarm, can also be connected to pro-

vide an audible and visible indication of smoke detector status.

Specifications

Operating Voltage/ Alarm current

Mounting base dependent (see chart)

Standby current

120 mA maximum

Sensitivity

3% ± .7% / ft.

Weight

0.5 ib. (277 g)

Size

3.2˝/8.1 cm height

6.2˝/15.8 cm diameter

Construction

Flame retardant Noryl plastic

Operating Temperature

32° to 120°F (0° to 49°C)

Humidity Range

10 to 93% RH non-condensing

Air Velocity Rating

0 to 3000 fpm maximum