Ei225EN Carbon Monoxide Alarm

This product is End of Life – Replace with Ei3018

The Ei225EN is a Carbon Monoxide Alarm with 230V AC mains power supply.  It is most suitable for location in rooms containing a fuel burning appliance.

  • Proven electrochemical CO sensor
  • 230V AC supply
  • Pre-alarm indication gives early warning of CO
  • Test/Hush button
  • Memory feature
  • Integrated piezoelectric sounder
  • 5 Year guarantee
EN 50291-1:2010 + A1:2012

This product is End of Life - Replace with Ei3018

The Ei225EN is a mains powered Carbon Monoxide Alarm fitted with a high performance, proven electrochemical sensor to detect the presence of toxic levels of Carbon Monoxide (CO).   Each sensor is individually calibrated and tested in Carbon Monoxide gas to ensure accuracy.  

When the Alarm detects potentially dangerous levels of CO, the red LED flashes and if the CO persists the alarm will sound. The rate of flashing of the red LED indicates the level of CO. The higher the level of CO detected, the sooner the alarm will sound.

The Alarm self-checks its sensor and internal circuitry regularly.  Any fault condition will be indicated by a combination of visual and/or audible indicators (ie yellow flashes and beeps).  

The memory feature allows an Alarm that has previously activated to be easily identified (as the red LED will continue to flash for 24hrs after the event or afterwards when you press the Test button).

The Test/Silence button allows the user to check the operation of the Alarm.  This will check the sounder, sensor and internal circuitry.


Product life:6 years
Supply voltage:230V AC. 50Hz
Sound level:85 dB(A) at 3m
Button test:Checks sensor, electronics and horn
Silence function:Silences alarm once for 4 minutes if <150ppm
Visual indicators:
Green LED: Power
Red LED: Pre-alarm, alarm, hush mode and memory
Yellow LED: Fault
Memory feature:Records last alarm event
End of Life:
3 yellow flashes every 40 seconds to indicate that unit must be replaced
Normal Operating and Storage Temperature Range:-10°C to 40°C
Normal Operating and Storage Humidity Range:15 % to 95 % Relative Humidity
Plastic material:UL94V0 flame retardant
Fixing:Screw fixings supplied
 Product: 133mm x 103mm x 43mm
 Packaged: 138mm x 108mm x 45mm
Product only: 192g
 Packaging: 232g
Warranty:5 years 

Product Manual

Product Datasheet