A single or even a few combustion analysis measurements during a burn likely will not tell you much about your system.
You would need regularly spaced or continuous sampling to really understand what is happening during a wood burn.
Here's why: the exact same load of wood will produce a variety of different gasses at different rates depending on HOW it is burned.
How hot is the burn? How quickly is the wood heated? Split size and surface area matters to this. Heck, the same exact load of wood could be STACKED differently in the firebox and have an entirely different burn profile!
Since you're then feeding the combustion process a variety of products at different rates throughout the burn, taking a look at the products of that combustion at any given time doesn't really tell you much.
This is very much the opposite of a gas or oil burner, where you feed the metered rate of identical combustion products throughout a burn cycle. That system reaches a steady state quickly where you can use combustion analysis to tune it in a way you cannot with wood.
Give this paper a read: (broken link removed)
"Rapid heating through the range of active pyrolysis tends to produce little charcoal, much tar, and highly flammable gases that are rich in hydrogen, carbon monoxide, and hydrocarbons; slow heating tends to produce much charcoal, little tar, and less flammable gases in which there is much water and carbon dioxide ( 79 ). In slow heating, decomposition proceeds in an orderly manner in which there is stepwise formation of increasingly stable molecules, richer in carbon and converging toward the hexagonal structure of graphitic carbon (9 , 3 9 , 8 7). In very rapid heating, macromolecules may be literally torn into volatile fragments with little possibility of orderly arrangement (7 9)."
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I'd suggest that rather than a few measurements that are difficult and expensive to take, you'd be much better off measuring something easy—like temperature— and datalogging it throughout a burn if you really want to understand and troubleshoot a system.
Here's a load of wood in my BK from ~11AM yesterday to a reload ~8AM today. The jump around 8PM is where i bumped the t-stat for a little extra heat. Around midnight it transitions to more of a coaling stage. Before that combustion is variable and cycled by the BK t-stat air control. A measurement of combustion gasses anywhere in that first 12 hours could be all over the map—its constantly changing.
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