The Hochiki SPC-24 Projected Beam Smoke Detector consists of an emitter and receiver. The SPC-24 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.

STANDARD FEATURES
• Microprocessor based for reliability
• Simple setup and 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 (purchased separately)
• Color-coded emitter (red) and receiver (green) labels for easy recognition
• Adjustable to one of the three obscuration settings of 25%, 50% or 70% per span
• Voltage and RF transient protection