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VOC concentration conversion (PID)

VOC concentration conversion (PID)

VOC concentration conversion (PID)

(OP)
Hello,

I need an information about the  conversion of VOC concentration.
I have a real concentration measured with a PID detector. The gas I analyse is a mixture of several alcools. I have calculated the response factor of the mixture and the average weight molar. So, I obtain the real concentration in ppm(vol), that I can convert in mg/Nm3.

But, I have to communicate the results to an organism in total carbon equivalent. I don't know how to convert from real ppm to equivalent carbon ppm.

With the FID technology, I know that there is a factor of 3 to apply from ppm C3H8, to ppm equivalent carbone. Is it the same thing with PID ?
How can I compare FID and PID results...

Sorry for my english level. Thanks for your answers.

Christelle.
FRANCE
tavernic@essilor.fr

RE: VOC concentration conversion (PID)

Good night:

Sorry for delay on response...I'm new in this forum.

So, you can check for PID factors at BWT page (www.gasmonitors.com) or at RAE wab page...There's some interesting articules regarding PDI and FID.

They aren't the same:  Photoionization detector converts a signal that comes from an electric-excited ion, meanwhile flame ionization compares an spectrum from a VOC against hydrogen signal response.

Hope this could help you.
 

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