PL-SPB24N BEAM SMOKE DETECTOR REPLACES PART PL-1430027
Model SPB-24N Stock #1430027
The 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 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 SPB-24N Projected Beam Smoke Detector consult the SPB-24N Installation Instruction Guide and the applicable NFPA Standards for additional guidance.
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 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 microcomputer compensates in such a manner that the signal moves closer to the reference data at a rate approximately +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.
Microprocessor based for reliability
Simple setup & alignment with signal strength LEDs
Provides 60 feet 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 recognitionc