GE Security 521CRXT, 528BXT-10PK Specsheet
E S L
P R O D U C T I N F O R M A T I O N B U L L E T I N
521 SERIES
Low Profile,
Self-Diagnostic, TwoWire, Photoelectric
Smoke Detector
with CleanMe™
UL Model numbers: 521B, 521BXT, 521CRXT
ULC Model numbers: 528B, 528BXT
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LISTED
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California State Fire Marshal Approved
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• CleanMe™ remote maintenance
reporting reduces false alarms
• Smart dual fixed/rate of rise heats
work with photo chamber to catch
fires faster
• Built-in drift compensation reduces
false alarms
• Field replaceable optical chamber
makes servicing a snap
• Small, low profile design blends in
with any environment
TM
The ESL 521 Series self-diagnostic, two-wire
smoke detectors are the industry's first conventional
direct-wire smoke detectors with analog features such
as remote maintenance/trouble reporting (CleanMe™),
drift compensation, and multi-criteria detection.
The 521 Series continually monitor their own sensitivity and operational status, and provide a visual and
remote trouble condition if they drift out of the sensitivity range or fail internal diagnostics. This meets NFPA
72 field sensitivity testing requirements without the
need for external meters. The 521 has a unique feature
enabling it to send a signal (CleanMe) to the ESL 505
module (sold separately) when it has drifted outside of
its UL Listed sensitivity range or has failed its internal
diagnostics test. The 505 is an interface module that
will signal any panel via relays when the 521 is dirty.
Several control panels have the CleanMe software built
in, eliminating the need for the 505 module. When
CleanMe is not desired, simply leave the switch on the
521 off and it will work as a normal two wire detector.
CleanMe allows the installer time to schedule a service
call and avoid a false alarm.
Time between cleaning detectors is dramatically
increased because of the 521's built-in drift compensation. This feature, usually only available in analog
systems, allows the detector to automatically adjust its
sensitivity over time as it becomes dirty, increasing dust
life.
And when the 521 has told you that cleaning is
necessary, it's literally a snap with ESL's patented field
replaceable optical chamber.
continued
521 Series ESL Photoelectric Smoke Detectors
The multi-criteria model 521XT photoelectric smoke
detector/fixed rate of rise heat detector includes fast
response algorithms for a quick response to both flaming
and smoldering fires. Fast response algorithms allow the
heat detectors to work intelligently together with the photoelectric smoke detector. As soon as the heat sensor detects
a rapid rise in temperature, the sensitivity of the photoelectric sensor increases allowing it to detect smaller particles of
combustion faster.
Architectural and Engineering Specifications
The ESL 521 Series photoelectric smoke detector is a lowprofile, self-diagnostic , two-wire detector that monitors its
own sensitivity and operational status. This detector meets
NFPA 72 field sensitivity requirements without the need for
external meters. Built-in drift compensation automatically
adjusts the sensitivity as the detector gets dirty. Normal
sensing occurs every 9 seconds. This rate doubles when a
signal exceeding the alarm threshold value is sensed. Two
additional successive signals above the threshold level will
initiate an alarm.
See installation instructions for information about correct
installation and maintenance.
The proprietary optical sensing chamber is field replaceable,
allowing quick and easy cleaning and maintenance.
Dimensions:
Specifications:
Product Data
Voltage..... Dip switch 1 “on” 6.5 – 33 VDC, polarity sensitive
Maximum ripple (pk to pk) ....................................10% (V
Typical average standby current (24V) .........................70µA
Typical alarm current (24V) ................ up to 60mA max, if not
Alarm Contacts .........................500mA @ 36 VDC (resistive)
Aux. Relay contacts............ 2A @ 30 VDC, 1 A @ 120 VAC
Sensitivity — photoelectric .................. 3.1% + 0.50 – 1.00%
Operating temperature ............... 32°F to 100°F (0° to 37°C)
Operating humidity range ............ 0 to 95% Non-condensing
RFI Immunity ......................... 20 V/m minimum; 0-1000MHz
Color .................................................... White head and base
Field wiring size ................................................... 12-24 AWG
Detector packaging............................10 detectors per carton
Heat detector specifications .. Rate of rise — 15°F/min and >
UL two-wire compatibility identifier....Dip switch 1 “on” S09A
Drift compensation adjustment........................... 1.0%/ft. max
Detector head dimensions...................... 5” (12 cm) diameter
Mounting dimensions..................... 4.75” (12.5 cm) diameter;
Reset time.................................................1 second minimum
Listings ........................................................ UL, ULC, CSFM
Dip switch 1 “off” 8.5 – 33 VDC, polarity sensitive
p - p
limited by control panel
105°F (8.3°C/min and > 40.6°C)
Fixed — 135°F (57°C)
Dip switch 1 “off”S10A, S11A
2” (5 cm) height
0.3” (0.8 cm) height
)
2" (5cm) 5" (12cm)
Model No. Description
521B 2-wire, photoelectric, 6-24 VDC, UL listed
521BXT 2-wire, photoelectric, 6-24 VDC, multi-criteria algorithms, fixed/rate of rise heat, UL listed
521B-10PK 10 pack of 2-wire, photoelectric smoke detectors, 6-24 VDC with CleanMe™ not individually boxed
521BXT-10PK 10 pack of 2-wire, photoelectric smoke detectors, 6-24 VDC with fixed/rate of rise smart dual heat and
CleanMe not individually boxed
521CRXT 2-wire, photoelectric, 12-24 VDC, aux. relay, multi-criteria algorithms, fixed/rate of rise heat, UL listed
528B 2-wire, photoelectric, 6-24 VDC, ULC listed
528BXT 2-wire, photoelectric, 6-24 VDC, multi-criteria algorithms, fixed/rate of rise heat, ULC listed
Accessories
505 Module that interprets the 521’s CleanMe signal for panel and can convert 2-wire 521 Series to 4-wire
inputs on panel
401 Test magnet in plastic shell for pole mounting
SM-200 Smoke! in a Can® (canned smoke) for functional testing of smoke detectors
211 Replacement optical chambers (set of 10)
ESL
a product of sentrol
SENTROL
12345 SW Leveton Dr., Tualatin, OR 97062
Tel.: 503.692.4052 Fax: 503.691.7566
http://www.sentrol.com
U.S. & Canada: 800.547.2556
Technical Service: 800.648.7424
FaxBack: 1.800.483.2495
Sentrol reserves the right
to change specifications
without notice.
©2000 Sentrol
E-4054-st10K-0800
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