How to get voltage reading into ppm

libelium-dev
Posts: 27967
Joined: Mon Sep 28, 2009 1:06 pm

Re: How to get voltage reading into ppm

Post by libelium-dev » Mon Nov 28, 2016 11:44 am

Hi,

Yes, you need to know at least 2 values of CO2. Take a look at this guide about calibration process. After the calibration process you can use the calculateConcentration function to covert in ppm.

Regards

sakshi
Posts: 7
Joined: Wed Oct 26, 2016 12:37 pm

Re: How to get voltage reading into ppm

Post by sakshi » Mon Nov 28, 2016 12:34 pm

Thank You so much :)

libelium-dev
Posts: 27967
Joined: Mon Sep 28, 2009 1:06 pm

Re: How to get voltage reading into ppm

Post by libelium-dev » Mon Nov 28, 2016 12:54 pm

You're welcome!

SrKlein
Posts: 8
Joined: Tue Sep 20, 2016 1:47 pm

Re: How to get voltage reading into ppm

Post by SrKlein » Fri Jun 22, 2018 9:45 am

First of all, my apologies for bumping such an old thread, but I have been searching the forums for an answer to my question and it is partially treated here, so I thought it was better to answer this thread than opening a new one.

I need to get the values in ppm for CO2, O3, Air Pollutants1, and Air Pollutants2.
I tried to use the same method described for CO2 with the O3 sensor unsuccesfully, and when I tried to guess how to apply it to AP1 or AP2 and saw the charts... well... I got completely lost.
Could anyone provide the formulas for the sensors mentioned above? Thanks in advance.

libelium-dev
Posts: 27967
Joined: Mon Sep 28, 2009 1:06 pm

Re: How to get voltage reading into ppm

Post by libelium-dev » Mon Jun 25, 2018 8:25 am

Hi,

You have to take a look at the graph of those sensors and get Rs/Ro to know the ppm values
http://www.libelium.com/downloads/docum ... df#page=43
libelium_files/gases_calibration.pdf

Regards

libelium-dev
Posts: 27967
Joined: Mon Sep 28, 2009 1:06 pm

Re: How to get voltage reading into ppm

Post by libelium-dev » Mon Jun 10, 2019 5:13 pm

Please test again and be sure you're logged when trying to open the links,
http://www.libelium.com/downloads/docum ... df#page=43
libelium_files/gases_calibration.pdf

Regards

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