thank you for your answer. I didn't mean that, though. My mistake. Did not clarify.
I meant, while doing what you described, I am changing the values of the gain and load resistance, but I am doing this randomly and only based in trial and error
I am looking for info like:
increasing the gain --> increases the sensitivity/ gets saturated with less concentration...
increasing load resistance --> ......
In this way knowing more or less the concentration to be measured we can choose the values for gain and load resistor...
Moreover, I would like to confirm how to get the values out of the graph supplied.
We should get a formula out the logarithmic graph, considering the the line as a straight line?
So having the formula and the Ro (in air measurement) we can have the gases values ?
Dont really know (as a developer) if that is the correct path for getting the gases values.