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Help with sensitivity curve of MQ8 gas sensor.

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trixkire

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Hi,

I am new here. I want to find out how I can generate an equation F(y) that when I am feeding V values then I approximate values in ppm. Can anyone point me to a tutorial or resource that I can use to calculate the equation? Thank you!

sensitivity-curve.png
 

It's empirical curve that can best implemented as table with linear interpolation. Just pick up a number of sample points from the diagram.

A problem is however the large sensitivity variation over temperature and humidity, your sensitivity calibration is only valid for typical environmental conditions.
 
FvM said:
It's empirical curve that can best implemented as table with linear interpolation. Just pick up a number of sample points from the diagram.

A problem is however the large sensitivity variation over temperature and humidity, your sensitivity calibration is only valid for typical environmental conditions.
Click to expand...

Thank you FvM for your reply. In order to deal with temperature and humidity issues I want to calculate the values on the fly instead of using a look-up table. I will check some tutorials on linear interpolation to see if I can create the equation.
 

Alternatively, you can use the Fig. 3 resistance curve, which is almost linear in log-lin scale and apprximate it by an y = a*10^x + b relation.
 
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