Rob,
Was going to add this in previous note, but neglected.
If the fog has cleared from my noggin' this morning, the atmosphere contains
~21% oxygen. That is ~210,000 PPM
I have read various numbers for what minimum allowable percent oxygen is
allowable for human safety. I believe that it was 18-19.5% for a "no
effect" minimum permissible oxygen level. So that is 180-195,000 PPM
oxygen. That is why the sensors used for determining whether an atmosphere
is breathable or not, are not suitable for what you desire to do - they are
just not anywhere near sensitive enough.
Hope this helps
Steve Creswick
Sr Associate - Balanced Enterprise Solutions
http://www.linkedin.com/in/stevencreswick
616 834 1883
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