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System Sensor Europe, like the majority of manufacturers, is experiencing longer product lead times due to component shortages. As we actively work to improve this situation, your satisfaction remains our main priority. View our current estimated lead times.

– 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