Hello. I've just experimented with the CO sensor.
I have a gas chamber and I let a cigarette smoke to burn out completely. I placed the CO sensor inside the gas chamber and observed the results:

1. The results which I was getting of the CO sensor in air were around 0 ~ 0.3 V

2. As soon as I put the CO sensor inside the gas chamber, the output was 3.299... V

My question is: - is there a way to control the sudden jump of voltage?

I've placed the CO sensor in socket 3B.
The orientation is shown in the gas board manual. I am just following their directions.

Anyway, I can notice the changes because as I ventilate the chamber from the cigarette smoke the voltage output will decrease which tells me that the sensor is working and sensitive to CO concentration but it is too sensitive. that's the problem.

Hi AmroQuandour,

how long does it takes between samples of the sensor, and what are the dimensions of the chamber? In our tests it takes a couple of minutes until we saturate the sensor. Also, take into account that if you are burning the cigarette inside the chamber, and it is hermetically closed, you will also be consuming a lot of oxygen in the combustion, which will accelerate the reaction.

Regards.