Yes CO alarms sensors have a max life of 6 or 7 years; on some Brands alarm will shut down automatically after this period measured from initial power up.
There'll be some warning beeps before this happens.
See this link for data from a manufacturer:
http://www.accuracymatters.com/edu_chart.htmlOwner Occupiers are more at risk from CO events than tenants, as owner occupiers are not having a mandatory Corgi annual check of their gas appliances.
However even tenants will not normally have their own appliances checked by the Landlord's Corgi man, though that doesnt appear to apply in Scotland.
Own appliances typically are portable LPG heaters and of course the good old cooker.
I have seen poor pubic housing where tenant actually leaves gas grill on to heat kitchen.
CO alarms are more expensive than smoke alarms as they are more complex devices, and of course the volume is nowhere near that of smokes...yet.
Increasing number of US cities do mandate fitting of CO alarms IN ALL DOMESTIC DWELLINGS...& that's not just new build either
ie its often retrospective; I recall Chicago was first city to implement some years back
in 1993, and New York the most recent.
In US, CO Alarm manuals typically say call 911 and I believe that many crews there have CO detection analysers, and can seal off house until declared safe.
I have powerpoint on subject of CO poisoning aimed at Social Housing providers which I could make available to FRS if of interest.