Edwards Signaling 500 Series Catalog Page

Smoke Detectors
with Auxiliary
Functions

500 Series

Edwards Signaling Catalog u Conventional Initiating

Overview

Edwards brand 500 Series two-wire conventional photoelectric
smoke detectors bring together trusted technology and a full line
of features that meet the demands of every type of application.
The 500 offers sounders in two-wire applications, specifically to
meet residential code requirements.

Edwards is also proud to offer proven technology like CleanMe®,
dust compensation, field replaceable optical chambers, and self­diagnostics. CleanMe® is only available on the 500 2-wire models
and will communicate with compatible FACPs when servicing is
required.

500 Series detectors work on a light-scattering principle. A pulsed
infrared light-emitting diode serves as the light source, and a high­speed photo diode as the sensing element. This design has supe­rior protection against nuisance alarms caused by dust, insects,
RF interference, and ambient light.

The proprietary optical chamber is field replaceable. In the event of
a confirmed alarm the LED will light continuously. The unit indi­cates trouble by flashing the LED every second. This meets the
NFPA 72 field sensitivity testing requirements.

Units with built-in 85dBA sounders emit a temporal 3-3-3 tone
pattern when in alarm and will emit a steady tone when the input
power is reversed. All wiring terminates in clamp-type screw
terminals. The detectors mount to a standard single-gang electri­cal box, a four-inch octagonal, four-inch square electrical box, or
WIREMOLD No. 5739 fixture box.

Standard Features

• Remote maintenance (CleanMe®) reporting and built-

in drift compensation reduces false alarms

• Self diagnostics eliminates the need for external meters

• Field-replaceable optical cham­ber makes service fast and simple

• Small, low profile design blends with any environment

• Optional auxiliary functions include:

• Integral sounder

• Auxiliary relay

• Fixed/Rate-of-Rise heats

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2" (5cm)

5" (12cm)

500 Series detectors are ideal for both retrofit applications and
new installations alike. They are particularly well-suited for instal­lations where detector reliability is essential, but where analog
devices may not be appropriate or feasible. With their replaceable
optical chambers, these detectors are equally well-suited to dusty
environments where detectors require frequent cleaning.

AssemblyApplication

Optional fixed temperature sensor

Diagnostic LED

Optional rate-of-rise sensor

Photoelectric sensor

Replaceable optical chamber

Detector cap

Mounting and Installation

500N detector bases mount directly to standard single-gang elec­trical boxes, three-inch round, or four-inch octagonal boxes. De­tector heads simply twist onto the base. Heads are equipped with
a break-away locking tab, which prevents unauthorized removal.
Terminals accept 24 to 12 AWG field wiring.

Typical Wiring

Specifications

Electrical

Power Supply 8.5-33VDC (12/24 V operation)

Maximum ripple pk-pk (6/12/24V) 10% (Vpk-pk)
Typical average standby current 70 μA
Typical alarm current (6/12/24V) up to 60 mA max if not limited by

Auxiliary relay contacts
(521NCRXT only)

Photoelectric sensitivity 3.1% + 0.5 - 1.0%

Environment

Operating temperature 32° to 100° F (0° to 37° C)
Operating humidity range 0 to 95% non-condensing
RFI immunity 20 V/m min; 0-1000 MHz

polarity sensitive

control panel

1.0 A @ 30 VDC; Form C

Dimensions

Physical

Color White
Field wiring size 12-18 AWG (16-22 recommended)
Heat detector specifications Rate-of-Rise:

15° F/min and >105° F
(8.3° C/min and >40.6° C)

Fixed Threshold: 135° F (57.2° C)
UL 2-wire compatibility identifiers S10A
Sounder output (521NCSXT only) 85dB @ 10 feet
Drift compensation adjustment 1.0% ft. max
Detector head dimensions 5.5 D x 2" H (14.0 x 5 cm)
Mounting dimensions 5.25" (13.3 cm) diameter;

0.3" (0.8 cm) height

Regulations

Reset time 1 second min
Listings C-UL-US, CSFM, MEA

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