Ray,
I have a CO detector installed in my rental property, I spent a lot of time researching and trying to find specs wrt such detectors. There appears no mandated specifications exist in Australia relating to CO detectors used in domestic installations, I finally purchased one thru a local plumbing supplies around the $100.00 mark. From memory it is set to activate at 50ppm of CO.
I was going to install one in our C.T. as we sometimes use a small portable gas heater as a prewarmer and turn it off before retiring but am awaiting possible rules and regs that may eventuate from a bill that was introduced by the previous Government into Victorian Parliament dealing with the possible introduction of such detectors in residences, its all gone quiet and a decision looks like being a long way off. Think I`ll just install it anyway.
I have to visit it for a battery check soon, if you want further details mail me at :-
sunelectronics@bigpond.com
Leigh