Hochiki America Corporation
7051 Village Drive, Suite 100 • Buena Park, CA 90621-2268
Phone: 714/522-2246 • Fax: 714/522-2268
Technical Support: 800/845-6692 or technicalsupport@hochiki.com
06/2000
The near infrared pulsed beam generated by the emitter
is sensed by the photodiode of the receiver, where it is
converted into an electrical signal. This signal is then
amplified and applied, via an analog to digital converter,
to a microprocessor. The normal state signal (the initial
beam data) once stored in the microprocessor is used
as reference for comparison with subsequent beam
signals.
When there is a difference between actual beam
strength and stored reference data that exceeds the
PRODUCT LISTINGS
Underwriters Laboratories: S1383
Factory Mutual: OD8A1.AY
CSFM #: 7260-0410:141
APPLICATION
STANDARD FEATURES
• Microprocessor based for reliability
• Simple setup & alignment with signal strength LED's
• Provides 60 foot on center linear protection at
a range of 32.8 feet to 328 feet
• Automatic compensation for signal drift or
dirty lens
• Three field adjustable sensitivity settings
• Form A alarm and Form B trouble contacts
• Calibrated filters available to verify sensitivity
• Color-coded emitter and receiver labels for
easy recognition
OPERATION
Continued on back.
SPB-24N PROJECTED BEAM SMOKE DETECTOR
Specifications subject to change without notice.
SPECIFICATIONS
Rated Voltage 24VDC
Working Voltage 19VDC - 33VDC
Supervisory Current 250µA @ 24VDC
Alarm Current 20mA @ 24VDC
Trouble Current 20mA @ 24VDC
Ambient Temperature
Range
32
°
F -
122
°
F
Sensitivity Test Feature Manufacturers test filters
Dimensions 5.5" Tall
3.2" Wide
4.0" Deep
Mounting Wall mount
or
Single Gang Box
The HOCHIKI America SPB-24N Projected Beam
Smoke Detector consists of an emitter and receiver.
The projected beam smoke detector should be placed
so that smoke generated by a fire will likely rise into the
path of the beam. The receiver is constantly monitoring
and measuring the intensity of the beam transmitted by
the emitter. Should the smoke from a fire cause a
decrease in the signal strength of a magnitude that
exceeds the programmed obscuration setting, an alarm
signal is generated.
The SPB-24N Projected Beam Smoke Detector can
provide vital fire detection in applications where other
type detectors may not be able to respond quickly, or at
all, to a fire condition. Examples of some applications
where projected beam smoke detectors have been
successfully used include:
atriums, gymnasiums, theatres, museums,
factories, tunnels, churches, stables,
anechoic chambers
and high air velocity areas. The HOCHIKI America SPB-
24N Projected Beam Smoke Detector may also be used
in conjunction with more traditional spot type smoke
detection devices to provide an even more
comprehensive detection system.
For more information on how to install the HOCHIKI
America SPB-24N Projected Beam Smoke Detector consult
the SPB-24N Installation Instruction Guide and the applicable
NFPA Standards for additional guidance.
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