Combustion Analyzer: CO2 sensor only or O2 sensor only?

Damon

What do you guys think about analyzers that measure O2 vs CO2? My concern is that the O2 versions require ~annual sensor replacements and the CO2 measurers don't so the latter would be more cost effective in the long run. I'm looking at the UEI Smartbell (CO2) for ~$420) and the UEI C50 (O2) for ~$330. Neither measure CO. Any other analyzer suggestions in that price range?

R Mannino

C75

The C75 does CO, yeah it's an O2 sensor and has all the accompanied baggage involved with an O2 sensor.

Steamhead

Don't even bother

with an analyzer that doesn't do CO and CO/air free. You MUST measure CO and CO/AF on every job.

R Mannino

C75

The C75 does both of those Frank and although it may not be a professional grade analyzer it will do the job.

Damon

Thanks for the input

Any reasonably priced C02 measuring units with CO?

R Mannino

C75

[url=http://cgi.ebay.com/UEI-Eagle1-C75-Combustion-Gas-Analyzer-w-probe-case_W0QQitemZ140343657543QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item20ad224447&_trksid=p3286.m20.l1116]http://cgi.ebay.com/UEI-Eagle1-C75-Combustion-Gas-Analyzer-w-probe-case_W0QQitemZ140343657543QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item20ad224447&_trksid=p3286.m20.l1116

Robert O'Brien

That's why

it's not a viable DIY tool, if you're lucky you can get 3 annuals out of a sensor.Then it's $300 to replace,cheaper to call a pro in this case

Damon

Exactly!

Now if the C75 measured CO2 and CO while calculating everything else, at that price it would be a steal since the CO2 sensor would probably last 10 yrs and the CO might go about 7 or 8 if it wasn't peaked out too much.

Robert O'Brien

It's

not a CO2 sensor,it's an O2 sensor,the analyzer converts the O2 reading to CO2

Ron Schroeder

O2

The old wet analysers measured CO2 because the consumables were cheaper and lasted longer than the consumables for O2 measurement.  So all of the industry tables were based on CO2 readings with a specific fuel.  The important thing is actually excess air measurement which is really an O2 measurement.  A true O2 measurement is better (even if it is "converted" to CO2) because it automatically corrects for differences in actual composition of fuel delivered from one fill to another.

Saggs

I've used a

C75 for a couple yrs and it's been back to Oregon twice for repairs and was gone for 2 weeks then over a month. The unit worked well but the readings on CO always seemed a little high and the stack temps seemed low? I got sick of the down time and bought a great unit from E-Instruments. I think it is the new 1100 model? It has replaceable CO and O2 sensors, filters out NoX so the CO readings are more accurate and has a built in printer. It was $1200 with the $150 1 year service contract. The tech support is great, and they can ship out field replaceable sensors within 2 days (pre calibrated). I do this for a living so it was definately worth it for me. I saw the unit down at the Buderus school in NH and was impressed w/ it there.

Damon

Ron

"A true O2 measurement is better (even if it is "converted" to CO2) because it automatically corrects for differences in actual composition of fuel delivered from one fill to another. "



Excellent point!