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Anyone know the difference between the regular CO reading and the CO(0) reading on the Bacharach Fyrite, and the regular reading and the CO dilution reading.

Where and when do I use the normal reading and where do I use the CO(O) reading and the dilution reading?

the CO(O) and dilution readings are always higher then the normal reading.

To my answer my own question,  The CO reading is the normal reading you use when checking anything not diluted (not upstream of a draft hood) and the CO(0) is used when checking upstream of a draft on say a natural draft boiler.