Ricardo, which planet mate? CO detectors are there to determine excessive concentrations only intended for its property as a toxic gas, due to faulty gas heating/cooking appliances. They are not suitable as fire detection in any circumstances.
My apologies fireftrm, my initial words were meant as a flippant remark only, not to be taken seriously, I most definately didn't mean the type of detection I am looking at right now installed through in my kitchen, to warn me of a problem with my gas boiler.
I am aware that CO detection is newish technology and is recognised and discussed within BS 5839-1:2002. as is other new forms of detection, such as video detection/fire warning for the deaf and multi sensor.
And "in practice" the recommendations made within the code relate to carbon monoxide fire detectors.
As kurnal has said in his post no 12, CO is a product of a fire, ( when incomplete combustion occurs as a result of a lack of O2) I myself have have witnessed on many occasions, CO detection now quite widely being installed in sleeping accommodation of hotels and guest houses.
If you check the BS, it provides recommendations as to where such detection can be used, as opposed to areas where they cannot be used. It accepts the use of CO in rooms opening onto escape routes in a category L3 system, however I bow to kurnals and others when they say multi sensor may be more suited in this enviroment(oh how I wish I had said that instead now)
I was basing that on dark rooms in my experience normally being small in size, and that a CO if installed would/should pick of the products of combustion in that room, as opposed to it travelling away along a corridor and into another zone, prior to it responding.
We live and learn, as confucious he say, he who claims to know all is a fool, for his learning has ceased. He who knows nought, and knows he knows nought, is the enlightened one, it is he who will be great.
