One of my First Alert Carbon Monoxide Alarm’s expired. This gave me an opportunity to look inside and see what’s inside this little gadget.
Here is a picture of the tear-down for those who are interested:
First Alert - Single Station Carbon Monoxide Alarm - model #: CO614
Here is a list of alternative carbon-monoxide sensors from Figaro.
Here is an alternative available at SparkFun. (Air Quality MQ135 sensor).
The second picture can be zoomed in by opening the image on a separate window.