Apollo SM501P

The Apollo SM-501-P is a photoelectric duct smoke detector for 4-wire conventional fire alarm systems, engineered for low-flow HVAC environments. Supporting up to 30 detector interconnection and operating across 500-4000 fpm air velocities, the SM-501-P provides reliable smoke detection with green pilot and red alarm LED status indication in commercial and industrial HVAC duct applications.

Key Features

• Photoelectric smoke detection for HVAC duct applications
• 4-wire conventional detector with standard fire alarm panel compatibility
• Low-flow technology for duct velocities 500-4000 fpm
• Up to 30 detectors field interconnectable for common alarm functions
• Multi-voltage operation: 230VAC, 115VAC, 24VAC, or 24VDC
• Visual status: Green pilot LED (normal), Red alarm LED (alarm condition)
• Temperature-rated to 140°F (60°C) maximum operation
• Duct width compatibility: 6 inches to 10 feet (1.8m to 3.05m)

Technical Specifications

• Detection: Photoelectric smoke sensor technology
• Wiring: 4-wire conventional configuration
• Operating Voltages: 230VAC, 115VAC, 24VAC, or 24VDC
• Air Velocity Range: 500-4000 fpm (2.5-20.3 m/s)
• Duct Width: 6 inches to 10 feet
• Temperature: 32-140°F (0-60°C) operating range
• Relay Contacts: Standard fire alarm configuration
• Interconnection: Up to 30 detectors per installation
• Standards Compliance: NFPA and ICC standards for HVAC supply/return ducts

Certifications

• UL Listed duct smoke detection component
• NFPA 72 National Fire Alarm Code compliant
• ICC compliant HVAC duct detector