521NCSXT [ETC]
Conventional Fire Alarms;
ETC 
•ꢀRemoteꢀmaintenanceꢀ(CleanMe)ꢀreportingꢀandꢀ
•ꢀOperatingꢀtemperatureꢀrange:ꢀ32°Fꢀtoꢀ100°Fꢀ
•ꢀSelf-diagnosticꢀcapabilityꢀcontinuallyꢀ
Conventional Fire Alarms
Smoke Detectors
500 Series
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.
Features and Specifications
monitors operation
built-in drift compensation
•ꢀField-replaceableꢀopticalꢀchamberꢀ
•ꢀLow-profileꢀdesignꢀblendsꢀintoꢀtheꢀceilingꢀ
•ꢀOptionalꢀauxiliaryꢀfunctionsꢀinclude:ꢀ
- Integral sounder; 85dB @ 10ft.
- Auxiliary relay
The 500 Series optical chamber is field replace-
able. In the event of a confirmed alarm the LED
12
- Fixed/Rate-of-Rise heats
will light continuously. The unit indicates trouble by
flashing the LED every second. This meets the
NFPA 72 field sensitivity testing requirements.
•ꢀWhiteꢀcolor
•ꢀIncludesꢀmountingꢀbase
(0°C to 37°C)
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.
Ordering Information
Drift
Operating
Voltage
Current Current Aux. Relay
Photoelectric
Sensitivity
Reset Compensation Field Wire
Description
Cat. No.
521B
(Standby) (Alarm)
Contacts
Time
Adj.
Size
Photoelectric Smoke
12/24V DC 0.00007 A 0.06 A
—
3.1%, +0.50, -1.00% 1 sec.
1%/ft. max.
18-12 AWG
Smoke with Fixed Temp and
ROR Heat
521BXT
12/24V DC 0.00007 A 0.06 A
—
3.1%, +0.50, -1.00% 1 sec.
1%/ft. max.
18-12 AWG
1 A @ 30V DC
Form C
Smoke with Heat and Aux Relay
Smoke with Heat and Sounder
521NCRXT 12/24V DC 0.00007 A 0.06 A
521NCSXT 12/24V DC 0.00007 A 0.06 A
3.1%, +0.50, -1.00% 1 sec.
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
T
M
12-8
www.edwardssignaling.com
Conventional Fire Alarms
Smoke Detectors
500 Series
Accessories
Description
Cat. No.
Replacement optical Chambers
(pkg. of 10)
211-10PKG
Weights and Dimensions
Approx. Shipping
12
Cat. No.
Weight (lb.)
521B
0.5
0.5
0.5
0.5
0.5
521BXT
521NCRXT
521NCSXT
211-10PKG
2" (51mm)
5" (127mm)
T
M
12-9
www.edwardssignaling.com
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