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– 4 Sensor Addressable Multi-Criteria Detector

The 2251CTLE Multi-Criteria fire sensor combines independent carbon monoxide, photoelectric smoke, thermal heat, and infra-red light sensor working together in one device managed by highly sophisticated and responsive algorithms.

The 2251CTLE Multi-Criteria fire sensor combines 4 separate sensing elements to act as a single unit. CO sensing (using EC cell technology) for monitoring CO products from a smouldering fire, IR sensing for measuring ambient light levels and flame signatures, optical smoke and heat detection. The integration of continual monitoring for all four major elements of a fire has enabled the creation of a detector that responds far more quickly to an actual fire and has the highest immunity to nuisances.

Working philosophy: normally it operates at a high immunity level, changing to very sensitive to fires when fire characteristics are sensed.


  • Unique, true 4sensor multi-criteria detector
  • Fully integrated Infra Red Sensing to determine the fire alarm decision
  • CO gas sensing for fastest response to slow developing and smouldering fires
  • Highest possible immunity to unwanted alarms
  • 6 alarm sensitivity settings
  • Compatible with all System Sensor protocols
  • Automatic drift compensation of smoke sensor and CO cell
  • Twin LED indicators providing 360° visibility
  • Wide temperature range
  • Built in test switch
  • Stable communication with high noise immunity
  • Third party certified with support for forthcoming Series 200 Advanced Protocol
  • -20°C to +55°C operating temperature range
  • 15 to 90% relative Humidity
  • Compatible bases: B500Series