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-2251TMB is a photoelectric smoke detector with supplementary 135°F thermal. Also known as Acclimate™, it uses advanced on-board software to combine the signals from the photo and thermal elements. The MRI-2251TMB is a true multicriteria detector capable of rejecting nuisance sources, but still responding quickly to real fires. Acclimate has the capability of adjusting its sensitivity according to the type of environment that it is installed in.

• 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

Model MRI-2251TB adds dual electronic thermistors to the MRI-2251B to provide 135°F (57°C) fixed temperature thermal sensing.

Model MRI-5251B uses an innovative thermistor sensing circuit to produce 135°F fixed temperature detection in a low profile package. These thermal detectors provide cost effective, intelligent property protection in a variety of applications.

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