System Sensor | 5602A Mechanical Heat Detector |194°F Fixed Temperature / Rate-of-Rise

The System Sensor 5602 Mechanical Heat Detector provides dependable fire detection for environments where smoke detectors are impractical due to dust, dirt, humidity, or normal airborne contaminants. This model combines a 194°F (90°C) fixed-temperature sensor with a rate-of-rise (ROR) element that activates when temperatures increase rapidly at approximately 15°F (8.3°C) per minute.

The self-restoring rate-of-rise feature allows for convenient field testing without replacing the detector, while the fixed-temperature element provides dependable protection against sustained heat conditions. The low-profile design blends into commercial, industrial, institutional, and utility spaces while maintaining code-compliant performance.

Features & Benefits

• Single-circuit mechanical heat detector
• Combination fixed-temperature and rate-of-rise operation
• 194°F (90°C) fixed-temperature activation
• Self-restoring rate-of-rise element for simplified testing
• Activates at approximately 15°F (8.3°C) per minute temperature rise
• UL maximum spacing of 50 ft x 50 ft on 10 ft ceilings
• External collector drops upon activation for easy identification
• Compatible with single-gang, octagonal, and square electrical boxes
• Reversible mounting bracket for flush or surface mounting
• Low-profile design for improved aesthetics
• Non-polarized terminals accept 14–22 AWG wiring
• UL, ULC and FM approved for fire alarm applications

Technical Specifications

• Model: 5602
• Circuit Type: Single Circuit
• Sensor Type: Fixed Temperature + Rate-of-Rise
• Fixed Temperature Rating: 194°F (90°C)
• Maximum Installation Temperature: 150°F (65.6°C)
• Rate-of-Rise Threshold: 15°F (8.3°C) per minute
• UL Maximum Coverage: 50 ft × 50 ft
• Operating Humidity: 5% to 95% RH (non-condensing)
• Mounting Options: Single-gang, 3.5″ octagonal, 4″ octagonal, 4″ square with plaster ring
• Listings: UL, ULC, FM Approved

Typical Applications

• Mechanical rooms
• Boiler rooms
• Warehouses
• Parking garages
• Utility rooms
• Industrial facilities
• Dusty or dirty environments where smoke detectors are unsuitable