Mailing-List: contact stoves-help@crest.org; run by ezmlm
On Sun, 22 Sep 2002 english@kingston.net wrote:
> Calibration is often done at only two points, ambient,
> where CO and CO2 are presumably zero...
> I have been able to get repeatable result
> from a visually perfect flame of different sizes with a kerosine lamp.
<snip>
Cool idea.
How repeatable is the kerosene lamp? At least it might tell you whether
you had long-term drift.
The electrochemical sensors will eventually wear out especially if exposed
to high conc of CO. It will be important to monitor that. [Another reason
to build good stoves... equipment lasts longer ;-)]
Remember that Fyrite does not actually measure CO2 but rather infers it
from O2 reading based on fuel composition that you enter. So 'CO2' from
kerosene isn't the same as 'CO2' from methane or wood; but you are still
checking the performance of your O2 sensor on a time-dependent basis.
If anyone IS measuring CO2 and not O2-- remember that atmospheric
concentration of CO2 is NOT zero, but ~380 ppm (0.04%) and climbing. If
you're measuring exhaust diluted 10:1, then CO2 conc will be 0.5%-1% and
the 'zero' could be an error of 5-10%. If you're measuring right above the
burner, it doesn't matter as much.
Tami
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