The Tyco 851PH (Part Number: 516.850.055) is an addressable marine optical smoke and heat multi-sensor detector designed for MZX Technology fire alarm systems. It combines photoelectric smoke detection with thermal sensing to identify both slow-smouldering and fast-flaming fires across marine, offshore, light industrial, and commercial environments.
Key Capabilities & Design
- Multi-Sensor Detection: Combines light-scattering optical smoke sensing with a thermal heat sensor to catch both slow smouldering fires and fast flaming fires.
- Built-in Line Isolator: Integrated short-circuit loop isolator.
- Marine & Safety Approvals: Approved by major classification societies (such as Bureau Veritas) for marine and offshore installations, plus SIL2 Certified for safety-critical systems.
- Drift Compensation: Extended automated drift compensation to maintain stable sensitivity as dust and age affect the chamber.
- Two-Way IR Communication: Compatible with the 850EMT Engineering Management Tool for testing, configuration, and diagnostics.
- Compatible Bases: Works with standard and isolator bases such as the 4B, 4B-C, and 4BI/5BI series (sold separately).
Technical Specifications
- Part Number / SKU: 516.850.055
- Sensor Type: Combined optical smoke and heat multi-sensor
- Operating Voltage: 20–40 VDC
- Quiescent Current: 380 µA
- Alarm Current: 3.3 mA
- Dimensions: Diameter 108 mm × Height 42 mm (Height 43 mm / Dia 109 mm depending on housing bezel)
- Weight: 76 g (excluding base)
- Operating Temperature: -25°C to +70°C
- Storage Temperature: -40°C to +80°C
- Relative Humidity: Up to 95% (non-condensing)
- Housing Material: Flame retardant FR3010 'BAYBLEND' (White)
- LED Indications: Fire, isolate, and fault indicators
- Safety Certification: SIL2 certified and approved by major marine classification societies