[Stoves] Combustion gas analysers
crispinpigott at gmail.com
Wed Sep 19 11:58:14 PDT 2012
Dear Gas Friends Again
I have received an update on the E8500 gas analyser regarding the NDIR
capabilities. If you get the NDIR option (which is $2500) it includes NRID
CO2, NDIR CO and NDIR CxHy which is very unusual.
The CO limit goes from 8000 ppm (the electrochemical cell) to 150,000 with
the NDIR. Having seen >50,000 in an actual stove test this is good news.
They report that the H2 value is detected and used to correct the
electrochemical cell numbers but is not reported (!) in the outputs. How
H2 is a good indicator of poor combustion. The ratio of the CO and H2 values
can be used to tell if the fire is entering a pyrolysis mode instead of a
whole fuel combustion mode. H2 rises relative to its common 1/3 proportion
of CO (which fraction depends on its % of the fuel on a molar basis) if
there is biomass being heated rapidly but not burned.
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