Conventional Fire Alarms
Conventional Fire Alarms
Smoke Detectors
500 Series
FIRE ALARMS
12
Edwards 500 Series two-wire conventional photoelectric 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 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.
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
• Self-diagnostic capability continually
monitors operation
• Remote 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
• Operating temperature range: 32°F to 100°F
(0°C to 37°C)
Ordering Information
Description
Cat. No.
Operating
Voltage
Current Current
(Standby) (Alarm)
Aux. Relay
Contacts
Photoelectric
Sensitivity
Reset
Time
Drift
Compensation Field Wire
Adj.
Size
Photoelectric Smoke
521B
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
Smoke with Heat and Aux Relay
521NCRXT
12/24V DC
0.00007 A
0.06 A
1 A @ 30V DC
3.1%, +0.50, -1.00%
Form C
1 sec.
1%/ft. max.
18-12 AWG
Smoke with Heat and Sounder
521NCSXT
12/24V DC
0.00007 A
0.06 A
1 sec.
1%/ft. max.
18-12 AWG
—
3.1%, +0.50, -1.00%
100°F
32°F
DC
85 dB
OP TEMP
MEA
12-8
TM
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
0.5
521BXT
0.5
521NCRXT
0.5
521NCSXT
0.5
211-10PKG
0.5
FIRE ALARMS
521B
2" (51mm)
12
Approx. Shipping
Weight (lb.)
Cat. No.
5" (127mm)
www.edwardssignaling.com
TM
12-9
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