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Bridge auto+ 5-2 combustion analyzer for natural gas engines

  • simclardy
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05 Sep 2019 19:56 #33437 by simclardy
So i purchased this combustion analyzer, and i tested an older whole house generator that runs on natural gas.
Question: what is the normal gas levels for this type of engine?
Lambda was lean and the o2 level was around 6%..
Just curious if this is normal?
I will try and test a new generator tomorrow.
Cheers

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07 Sep 2019 09:40 #33457 by Andy.MacFadyen
Yes 100% normal the analyzer isn't designed for engines running on natural gas. However there is a correction multiplyer -- I don't have to hand but I will try to find it.

" Welcome to the 21st"


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07 Sep 2019 17:15 #33464 by simclardy
So i checked a brand new kohler yesterday and it was 10% O2. So yeah. About the same.
The analyzer has fuel options in the menu; gasoline, cng, lpg, and diesel.
I thought this was to adjust for the different hydrocarbons. I guess the o2 is a percentage and has to add them all together. Maybe if i read it as ppm it would be more helpful?
I called briggs and Stratton and kohler and neither could give me emissions standards:(


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Today 06:48 #33799 by simclardy
So i ran a test on a 12kw kohler 12RESV and it was running rich. Lambda was 0.89
They don't give an adjustment, but it shows these units are not tuned properly. I will try some other brands when i get the chance.

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