Hochiki America SPB-24N User manual
Hochiki America Corporation
7051 Village Drive, Suite 100 • Buena Park, CA 90621-2268
Phone: 714/522-2246 • Fax: 714/522-2268
Thenearinfrared pulsedbeamgenerated bytheemitter
is sensed by the photodiode of the receiver, where it is
converted into an electrical signal. This signal is then
amplifiedand applied,via ananalogto digitalconverter,
toa microprocessor. Thenormal 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
easyrecognition OPERATION
Continued on back.
SPB-24N PROJECTED BEAM SMOKE DETECTOR
Specifications subject to change without notice.
SPECIFICATIONS
RatedVoltage 24VDC
WorkingVoltage 19VDC - 33VDC
Supervisory Current 250µA @ 24VDC
Alarm Current 20mA @ 24VDC
Trouble Current 20mA @ 24VDC
AmbientTemperature
Range
32
°
F -
122
°
F
SensitivityTestFeature Manufacturerstest filters
Dimensions 5.5" Tall
3.2" Wide
4.0" Deep
Mounting Wall mount
or
SingleGangBox
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
pathof thebeam. The receiverisconstantly monitoring
andmeasuring theintensity of thebeam transmittedby
the emitter. Should the smoke from a fire cause a
decrease in the signal strength of a magnitude that
exceedsthe programmedobscurationsetting, analarm
signal is generated.
The SPB-24N Projected Beam Smoke Detector can
provide vital fire detection in applications where other
typedetectors maynot be ableto respondquickly,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
andhighairvelocityareas. The HOCHIKIAmericaSPB-
24NProjectedBeam SmokeDetectormay alsobeused
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.
Specifications subject to change without notice.
Hochiki America Corporation • SPB-24N
programmed alarm obscuration reference level, a fire signal is produced. A trouble signal is generated if the beam is
more than 90% obstructed (as opposed to partially obscured by smoke).
The microprocessor also provides compensation for a change in received signal value, with time, caused by
contamination of the optics. Since such a change with time appears as a slow change in the beam signal, the
microcomputercompensatesinsucha mannerthatthesignalmovescloser tothereferencedataata rateapproximately
+1% per hour. When this compensating capability reaches a limit, the microcomputer automatically generates a
trouble signal.
A calibrated test filter is available upon request to test and verify the sensitivity setting of the projected beam smoke
detectors.
ENGINEERING SPECIFICATIONS
OPERATION,
continued
The contractor shall furnish and install, where indicated on the plans, HOCHIKI America SPB-24N Projected Beam
Smoke Detector. The detector shall have a range of 32.8 feet to 328 feet. The projected beam smoke detector shall
be field adjustable to one of the three obscuration settings of 25%, 50% or 70% per span. These settings shall be
capable of being verified with calibrated filters. Side to side spacing shall be a maximum of 60 feet on center.
Theprojectedbeam smokedetectorshall possescircuitrythat automaticallycompensatesfornormal ambientchanges
in the intensity of the emitted beam strength. The microprocessor shall provide compensation for a change in
received signal value, with time, caused by contamination of the optics. Since such a change with time appears as a
slow change in the beam signal, the microcomputer compensates in such a manner that the signal moves closer to
the reference data at a rate of approximately +1% per hour. When this compensating capability reaches a limit, the
microcomputer automatically generates a trouble signal.
The projected beam smoke detector(s) shall also signal a trouble condition if the beam has a blockage of 90% or
morethan 20 secondsand automaticallyresets tonormal when blockageis removed.
The projected beam smoke detector(s) shall be UL listed for these applications. Voltage and RF transient protection
shall be integral to the internal circuitry of the projected beam smoke detector so as to minimize false alarm potential.
To facilitate easy installation and setup, the projected beam smoke detectors shall employ signal strength indicating
LED's. Alignment shall be facilitated by turning an alignment adjustment wheel and monitoring the relative signal
strength based upon which LEDs are illuminated.
The detectors shall also illuminate a red LED, which is visible externally, when an alarm condition is indicated.
The projected beam smoke detector shall provide a Form "A" dry contact for alarm and Form "B" dry contact for
trouble.
INSTALLATION
The HOCHIKI America SPB-24N Projected Beam Smoke Detector shall be installed in accordance with the
Installa-
tion Instruction Guide
provided with every unit. Refer to the applicable NFPA Standards for additional guidance on
spacing, irregular ceiling surfaces and other design considerations.
NOTE: EOLR-24 required for power supervision.
FOUR WIRE CONNECTION TO THE CONTROL PANEL
