521BXT Datasheet, PDF (1/2 Pages) List of Unclassifed Manufacturers – Conventional Fire Alarms

Conventional Fire Alarms
Smoke Detectors
500 Series
12
Edwards 500 Series two-wire conventional photo-
electric smoke detectors work on a light-scattering
principle. A pulsed infrared light-emitting diode
serves as the light source, and a high-speed photo
diode as the sensing element. This design protects
against nuisance alarms caused by dust, insects,
RF interference, and ambient light. Built-in drift
compensation allows the detector to automatically
adjust its sensitivity over time as it becomes dirty.
The 500 Series optical chamber is field replace-
able. 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.
The 500 Series offers sounders in two-wire
applications, specifically to meet residential code
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.
Features and Specifications
• S elf-diagnostic capability continually
monitors operation
• R emote maintenance (CleanMe) reporting and
built-in drift compensation
• Field-replaceable optical chamber
• Low-profile design blends into the ceiling
• Optional auxiliary functions include:
- Integral sounder; 85dB @ 10ft.
- Auxiliary relay
- Fixed/Rate-of-Rise heats
• White color
• Includes mounting base
• O perating temperature range: 32°F to 100°F
(0°C to 37°C)
Ordering Information
Description
Photoelectric Smoke
Smoke with Fixed Temp and
ROR Heat
Smoke with Heat and Aux Relay
Smoke with Heat and Sounder
Cat. No.
521B
Operating
Voltage
12/24V DC
Current Current Aux. Relay
(Standby) (Alarm) Contacts
0.00007 A 0.06 A
—
Photoelectric
Sensitivity
Drift
Reset Compensation Field Wire
Time
Adj.
Size
3.1%, +0.50, -1.00% 1 sec. 1%/ft. max. 18-12 AWG
521BXT
12/24V DC 0.00007 A 0.06 A
—
3.1%, +0.50, -1.00% 1 sec. 1%/ft. max. 18-12 AWG
521NCRXT
521NCSXT
12/24V DC
12/24V DC
0.00007 A
0.00007 A
0.06 A
1 A @ 30V DC
Form C
3.1%, +0.50, -1.00%
1 sec.
0.06 A
—
3.1%, +0.50, -1.00% 1 sec.
1%/ft. max.
1%/ft. max.
18-12 AWG
18-12 AWG
100°F
32°F
DC
85 dB
OP TEMP
MEA
12-8
TM
www.edwardssignaling.com