Professional Home Safety from Honeywell

Honeywell Home Safety

SF340 Mains Powered CO Alarms


Every unit in the SF340 utilises the advanced ECOsure electrochemical cell sensing technology and comes complete with a full 5 year warranty. Every unit also offers up to 5 years battery backup allowing for continuous protection even in the event of power loss. This also allows the unit to be operated whilst waiting for permanent installation.

  • Unique 5 year module replacement system
  • Up to 5 years battery backup
  • Low maintenance and low cost of ownership
  • Secure installation
  • 230Vac
  • Easy integration within existing systems
  • Interconnect and relay output
  • Every alarm is tested and calibrated in Carbon Monoxide
  • No re-wiring or main unit replacement costs
  • 5 year warranty


The SF340 mains powered Carbon Monoxide Alarm must be installed by a competent person qualified to carry out electrical work according to current national wiring regulations. Please download the manual below for further information.

Technical Specifications

Detection PrincipleElectrochemical cell
Main Unit LifeNo replacement required
Module Life5 year life, 5 year warranty
Lifetime And Warranty10 year life, 5 year warranty
Operating Environment 
Operating Temperature Range-5 to +40°C
Electrical and Interconnection 
Operating Voltage230Vac
Backup Battery9Vdc pp3
Power Consumption<2.5W
Relay Output FittedSF340F
User Interface 
Module Replacement WarningDouble buzzer chirp every minute
Alarm IndicationBuzzer and flashing red light
Buzzer Output85 decibels (dB) at 3m
Alarm Levels150ppm, between 10 to 30 minutes, 350ppm within 6 minutes
Test FacilityYes
Models AvailableSF340E - 230Vac, SF340F - 230Vac + relay + interconnect
Weight575g approx.
Dimensions170 x 110 x 65mm