How do electric carbon monoxide detectors work?

Question

How does the electric carbon monoxide detector in cabin or cockpit on aircraft work?

You may find the Wikipedia article on Carbon monoxide detector informative. That article mostly talks about home detectors, but the technology is the same. — Greg Hewgill, Sep 14 '17 at 03:27
The amount of fire-on-aircraft quesitons you are asking is worrisome :-) — Caterpillaraoz, Sep 14 '17 at 10:06
I am currently working on description and operation of fire detention systems for my first shop rotation. — Myat Khant, Sep 14 '17 at 10:08
@MyatKhant: Good to know you're not an aspiring arsonist! :-P — Vikki, May 06 '19 at 03:46

score 2 · Answer 1 · answered Sep 07 '18 at 11:44

There are three major types of carbon monoxide senors.

Biomimetic: A gel changes color when it absorbs carbon monoxide.
Metal oxide semiconductor: When the chip's circuit detects carbon monoxide, electrical resistance decreases, and this triggers an alarm.
Electrochemical: Electrodes immersed in a chemical solution sense changes in current when they come into contact with carbon monoxide, and this change triggers the alarm.

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