There are three basic types of CO sensors discussed below:
metal oxide,
biomimetic and
electrochemical.
Note that although there are performance differences between the technologies, all detectors are tested and approved for their operation.
Metal Oxide
How It Works:
The original technology for detecting CO. Heated tin oxide reacts with CO to determine the levels of the toxic gas. Must connect to house power.
Features:
No need to remember to check the batteries as the unit plugs in. Battery backup is available for up to 20 hours.
Biomimetic
How It Works:
Gel coated discs darken in the presence of CO. Color change sounds an alarm.
Features:
Less expensive technology. Can be battery operated.
Electrochemical
How It Works:
Chemical reaction with CO creates an electrical current, setting off an alarm.
Features:
Highly sensitive and accurate readings at all CO levels. Most units come with a continuous digital readout and a memory feature that allows you to check past CO levels. Fast reset time.