Interlogix 541CXT 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

541 SERIES

Low Profile,
Self-Diagnostic,
Four-Wire,
Photoelectric
Smoke Detector

UL Model numbers: 541C, 541CXT
ULC Model numbers: 548C, 548CXT

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LISTED

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California State Fire Marshal Approved

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• On-site maintenance alert

• SmartHeat™ 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

The ESL 541 Series self-diagnostic, four-wire
smoke detectors are the industry's first conventional

direct-wire smoke detectors with analog features such
as drift compensation and multi-criteria detection.
The 541 Series continually monitor their own sensitiv­ity and operational status, and provide a visual indica­tion 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.
Additional diagnostic information is activated by apply­ing a magnet near the detector's integral reed switch.
This initiates a self-diagnostic routine and provides
visual indication of sensitivity level or indicates if service
is required.

Time between cleaning detectors is dramatically
increased because of the 541'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 541 indicates that cleaning is neces­sary, it's literally a snap with ESL's patented field­replaceable optical chamber.

The SmartHeat™ model 541CXT 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. This
increase allows the sensor to detect smaller particles of
combustion quicker.

continued

541 Series ESL Photoelectric Smoke Detectors

Architectural and Engineering Specifications

The ESL 541 Series photoelectric smoke detector is a low
profile, self-diagnostic , four-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:

2" (5cm)

Specifications:
Product Data

Voltage..............................................................8.5 – 33 V DC

Maximum ripple (pk to pk) ....................................10% (V

Typical average standby current (24V) ........................70 µA

Typical alarm current (24V) ..........................................15 mA

Alarm contacts..........................500mA @36 V DC (resistive)

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; 0-1000 MHz

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 >105°F (8.3°C/min and > 40.6°C)

Fixed — 135°F (57°C)

Drift compensation adjustment........................... 1.0%/ft. max

Detector head dimensions...................... 5” (12 cm) diameter

2” (5 cm) height

Mounting dimensions..................... 4.75” (12.5 cm) diameter;

0.3” (0.8 cm) height

Reset time.................................................1 second minimum

Listings.......................................................... UL, ULC, CSFM

5" (12cm)

p - p

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Model No. Description

541C 4-wire, photoelectric, 12-24 V DC, UL listed
541CXT 4-wire, photoelectric, 12-24 V DC, multi-criteria algorithms, fixed/rate of rise heat, UL listed
548C 4-wire, photoelectric, 12-24 V DC, ULC listed
548CXT 4-wire, photoelectric, 12-24 V DC, multi-criteria algorithms, fixed/rate of rise heat, ULC listed
541C-10PK 541C 10-Pack, not individually boxed
541CXT-10PK 541CXT 10-Pack, not individually boxed

Accessories

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)

©1998 Sentrol. Certain items in the Product Information Bulletin are protected under one or more of the following patents: 5,546,074; 5,708,414; 5,798,701;
5,821,866.

Sentrol reserves the right

to change specifications

without notice.

©1999 Sentrol

ESL

SENTROL

12345 SW Leveton Dr., Tualatin, OR 97062
Tel.: [phone] Fax: [phone]
http://www.sentrol.com

U.S. & Canada: 800.547.2556
Technical Service: 800.648.7424

a product of sentrol

FaxBack: 1.800.483.2495

E-3754-FLG15K-0399