
Model MRI-1251B ionization detector incorporates a unique single source, dual chamber design to respond quickly and dependably to a broad range of fires.


Model MRI-5251RB provides both 135°F fixed and rate-of-rise thermal detection. These thermal detectors provide cost effective, intelligent property protection in a variety of applications

• Ultra-high-sensitivity capability
• On-board drift compensation
• Transient rejection algorithms
• Environmental tracking
• Wide sensitivity range
• Rotary address switches
• Analog communications
• Sleek, low-profile design
• Low standby current
• Microprocessor design
• Superior EMI protection
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Model MRI-2251TB adds dual electronic thermistors to the MRI-2251B to provide 135°F (57°C) fixed temperature thermal sensing.


Model MRI-5251H provides 190°F (88°C) fixed temperature detection for high temperature applications.

•Unique ability to detect all four major elements of a fire
•Highest nuisance alarm immunity
•Advanced algorithms interpret and respond to the multiple inputs
•Six levels of sensitivity
•CO sensing for fastest response to slow-developing, smoldering fires
•Fully integrated infrared sensing to support the fire alarm decision
•Automatic drift compensation of smoke sensor and CO cell
•Superior EMI protection
•Twin LED indicators providing 360˚ visibility
•LEDs can be panel controlled to blink, latch on, latch off
•Built-in test switch

• 16 to 328 foot protection range
• Single-ended, reflective design
• Easiest alignment in the industry with digital display
• 6 field selectable sensitivity levels
• Optional integral NFPA 72 sensitivity test feature
• Removable plug-in terminal blocks
• Built-in automatic gain control compensates for signal deterioration from dust build-up
• Remote test station available
• Paintable cover
• Optional heater kits available

• Dual Action
• Key resettable
• Permanently attached Intelligent Addressable Module
• High-gloss red enamel finish
• Plastic breakrod
• Meets ADA 5 lb. maximum manual-force
• Mounts on standard single gang box, Secutron’s MRM-700 surface metal backbox or MRM-700WP weather proof backbox