In article ,
geoff writes:
In message
,
harry writes
On Apr 16, 11:23*pm, geoff wrote:
In message , Gib Bogle
writes





On 4/17/2011 8:40 AM, geoff wrote:

The gas pressure needs to be checked first, if it is low the gas and
fuel may not be mixing correctly.

Aah - the gas / fuel mixture

No chance of any carbon monoxide there

Just from first principles (no specific knowledge):

soot implies incomplete combustion

incomplete combustion can give CO

e.g. *4CH4 + 6O2 - C + 2CO + CO2 + 8H2O

It would if it was a gas / air mixture ...

Which is why they use a CO/CO2 meter, a Telegan for example

not really come across an oxygen meter in general use for measuring
combustion efficiency

--
geoff- Hide quoted text -

- Show quoted text -

Co2 meters were used in days of yore for measuring purely carbon
fuels ie coal.

No - co / co2 meters - measuring the ratio

As there is much less carbon in gas,

Would you like to expand on that ?

Do you really understand what you're talking about?

they are much less accurate which
is why oxygen analysers came in and are preferable.

Not amongst your average jobbin' fitter they aren't

My flue gas analyser has an oxygen cell and a CO cell.
CO2 is calculated from the oxygen content, knowing that
it's measuring natural gas flue gasses (I think you can
also set it for propane and butane, but I never have).
Mine doesn't calculate the CO/CO2 ratio - you have to do
that yourself, but the next model up does that for you,
for those who don't know how to convert units and do a
division;-).

I don't know what the situation is nowadays, but gas installers
didn't generally have flue gas analysers a few years back.
I bought mine when I installed my condensing boiler 10 years
ago, as although it was supposed to come pre-adjusted, it was
actually miles off the right settings, and it made a significant
difference getting it setup correctly.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]