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Re: %CO to PPM Conversion Question

Tony--Percent (%) is like parts per hundred, whereas ppm is parts per
million.  So 1% is the same as 10,000 ppm.  The easiest way to do it is just
to multiply the % figure by 10,000 to get ppm.  The Fluke instrument that
measures 0-1000 ppm would peg the needle at anything over 0.1%.  The exhaust
CO levels in your Audi should fall somewhere between 0.1% and 1.5%, so the
0-1000 ppm Fluke instrument would not work.  But if they make a 0-10,000 ppm
instrument, or better yet, a multi range instrument, that would work just

BTW, gas measurements are usually quoted in % or ppm by volume.  This is
what the Fluke device will register.

Best Regards,


Gerry C. Snow
Pacific Energy Research Associates, Inc.
Spokane, Washington, USA
Voice:  +509 624 4390
Fax:      +509 624 3433
E-Mail: gsnow@iea.com
-----Original Message-----
From: Tony Lum <tlum@flash.net>
To: quattro@audifans.com <quattro@audifans.com>
Date: Wednesday, October 06, 1999 4:18 PM
Subject: %CO to PPM Conversion Question

>Hi gang,
>A question for the more chemistry literate listers:
>Is it possible to convert %CO to a parts/million (PPM) equivalent?
>Reason I'm asking is that Fluke has a couple of new CO gas measuring probes
>that read 0-1000 ppm with a 3% accuracy.  The accessory aspirator probe
>looks perfect to gather EG samples from the CO measurement tube.
>Tony Lum
>Chemical illiterate