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Carbon Monoxide Alarms  How does a CO detector work?  There are
three basic types of CO sensors metal oxide, biomimetic and
electrochemical. Each is discussed in this chart. Note that
while there may be performance differences between these
technologies, all detectors are tested and approved for their
operation. The retail cost of a detector will generally relate
to the number of features included and its warranty conditions.
There are performance differences between these detector types.
However, changes to the CO standards should soon result in all
detectors, regardless of detector type, having to undergo
extensive testing. All will be certified to operate under
different environments (various chemical exposures, different
relative humidities, etc.) satisfactorily if they meet the
standards.  Carbon Monoxide Alarm Features  Carbon monoxide
alarms have a variety of different features. Befo