CO4000E Domestic Carbon Monoxide Alarm

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CO4000E Domestic Carbon Monoxide Alarm

The CO4000E battery operated is a 3V (two 1.5V AA batteries) single station carbon monoxide alarm specifically designed for residential use.

The CO4000E complies with BSEN50291:2001 & UL2034 and is designed to alarm at the following exposure levels:

>400ppm CO between 4 & 15 minutes

>150ppm CO between 10 & 50 minutes

>70ppm CO between 60 & 240 minutes

The CO alarm features an electrochemical CO sensor, an 85dB horn, a single button for test/silence and a red LED that blinks to indicate the unit is receiving power. The front access battery door allows battery access without removing the unit from the wall. The low power warning indicator will cause the alarm to “chirp” when the batteries need replacing. The low power warning indicator can be silenced for up to 8 hours. An alarm action chart identifies action steps to take if unit is in alarm.


  • Test button
  • Silence button for unwanted alarm and low battery warning signal
  • Easy battery replacement ( a front compartment )
  • User-friendly action chart


  • Dimensions: 8.4 (H), 12(L), 8(D) cm
  • Weight: 155.9 grams
  • Operating Voltage: Two 1.5V AA Batteries
  • Temperature Range: 4°C to 38°C (40°F to 100°F)
  • Humidity Range: 10% to 90% relative humidity (RH)
  • Audio Alarm: 85dB at 10 feet
  • Test Button: Electronically simulates a carbon monoxide condition, causing the unit to alarm
  • Alarm Reset: Automatic when carbon monoxide clears; Press Test/Silence button to reset manually
  • Sensor: Electrochemical
  • Indicator LEDs:  Listing: BSEN50291:2001 & UL2034
    • DC Power: Red LED flashes once per minute
    • Local Alarm: Audio alarm (4 beep, pause, 4 beeps) and rapidly flashing Red LED