Hochiki SPC-24

The Hochiki SPC-24 is a projected beam smoke detector designed for large open areas where conventional spot detectors are difficult or impractical to install. Using an emitter-receiver system, it monitors the infrared beam to trigger alarms when smoke reduces light signal strength beyond adjustable thresholds.

Key Features

• Projected beam design for large open areas and atriums
• Microprocessor-based operation with reliable sensing
• Three adjustable sensitivity levels (25%, 50%, 70% obscuration)
• Automatic compensation for signal drift and lens fouling
• Signal strength LEDs for easy alignment and commissioning
• Optional calibrated verification filters for sensitivity testing
• Color-coded units: red emitter, green receiver

Technical Specifications

• Voltage: 24VDC, Supply 19-33 VDC
• Detection Range: 32.8 ft to 328 ft (adjustable)
• Linear Protection: 60 ft on-center spacing
• Dimensions: 3.2"W x 5.5"H x 4.0"D
• Contact Ratings: Alarm and trouble contacts (Form A/B)
• Outdoor/Indoor Use: Yes (with protective housing)

Certifications

• UL Listed for fire alarm systems