co2 readings

[Gary80gas]

Hi all, what is the importance of the co2 reading? If the gas working / burner pressure and gas ratio and carbon monoxide figures are good according to MI.
If the co2 is out by 10 or 20% is this a performance issue or damaging to boiler or something else.

 

[Riley]

My understanding is that carbon dioxide is produced as a result of correct combustion and that manufacturers will advise as to the correct amounts of carbon dioxide to be produced as part of the combustion process

 

[newcastle phill]

Yes its related to combustion of oxygen and a fuel. A d a measure of efficiency.
In a perfect pure world if we burnt a fuel with 100% oxygen. We would get 100% carbon dioxide produced.

As it is. Fuels arent pure and oxygen is only 20.9% of the atmosphere - however it is a constant and doesn't change so from that they can derive carbon dioxide ranges and if its out of their spec then there is a combustion isssue

 

[Howsie]

LOL - if you burnt a fuel with 100% oxygen you wouldn't by around to measure it.

 

[newcastle phill]

I would if i hid in the back of my van in my reinforced tool chest !!!

 

[Dotty]

Harry, look up Stoichiometric Combustion, your answer's in there.

 

[Leezygeezer]

Burning 1 volume of gas with 2 volumes of oxygen produces products of combustion, the co2 produced is approx 15%, by adding excess air through forced draught simply dilutes the sample to drop it to the required MI % I.e. 8.8% etc. increased air = less co2 in the sample, the actual % doesn't change unless you start removing air beyond what is required for complete combustion