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Thanks Monoxide but this has just confused the issue even more so. Maybe you have copied these calcs straight out of a book? What does the 11.9 represent?,the same applies to the 20.9? Please explain? as the calcs mean nothing without knowing what the numbers represent. Anyone else have a...

Thanks for all the help,much appeciated. How does the FGA calculate CO2% in POC?, is there a calculation for this? How would one calculate the O2 in the POC? How would one calculate the air% in POC? I understand some saying the analyser calculates all these measurements so why bother with...

What does the ratio,ppm,co2 supposed to read when the boiler is safe? Just had a boiler serviced & the corgi man left me with a piece of paper that says the ppm is 779 & co2 10.2. What is the ratio? Is this ok? Boiler is a potterton profile 80e.