uei analyzer question

rwhtg

our company has 3 uei combustion analyzers. the oldest one is about 5years old the newest was purchased about 3 weeks ago. we have taken reading with all 3 at the same time in the flue. we get CO reading of 47ppm on the newest meter, the second oldest was about 44ppm, and the oldest was 99ppm. all meters have new filters and batteries. anybody run into similar issues?

kcopp

I bought a....

UEI about 2 1/2 years ago. I used it about 2 times and to be honest the readings were not anywhere near what they needed to be. I tried setting up a boiler the last time and it was a nightmare.... I had the factory rep out and he brought his Wohler 330 w/ him. The numbers comparably were way off. I returned the UEI for credit at my other supplyhouse, purchased a Wohler....

Tim McElwain

What are the model and numbers

of each UEI? Are these the ones with a CO2 sensor and CO Sensor or the older ones with O2 and CO sensors? I assume the numbers you gave are air free readings and were all taken with in 10 minutes of one another? If not the readings may vary somewhat. They are all under 100 so that is good.



I have from time to time tested 7 different brands of meters including UEI and find most of them very close in their readings.

rwhtg

yes they all have CO, O2, C02 sensors

the readings i gave were of COppm on the printouts. the readings were taken in a 6" flue with 3 test holes, one tester in each hole. after about a 10min run time of the burner.

Tim McElwain

UEI

makes two different kinds of testers:



One with CO2 sensor no O2, the O2 reading is an electronically calculated reading not actual sensing.



A different one with O2 no CO2 the CO2 reading is an electronically calculated reading not actual sensing.



Both have CO sensors.





Which ones do you have? What are the numbers of the testers?

rwhtg

i was unaware of that

is C75  the number u are looking for?

Tim McElwain

The C75

has an O2 sensor (good for two years) a CO Sensor (good for five years) the meter does not directly measure the following but calculates them electronically:



CO2, Efficiency and Excess Air.



The variable on your readings could result from the following:



1. Failure to properly calibrate CO before using.



2. Failure to clear instrument after the last test



3. Failure to set the meter up in a clean air environment



4. Age of the CO sensors



Go over the written procedures for the meter and make sure everything is set up correctly.



This is a lower priced tester by the way so may not have the exact accuracy of a higher priced meter. 

SWEI

C155

Just bought one of the new infrared-cell based C155s and I have to say I think it is a big step forward.  The new design measures CO2 and calculates O2 from that.  Both sensors are supposed to have a five year life, and UEI backed it up with five years of full warranty and calibrations.



I opted for the BlueTooth option in lieu of buying a printer.  When I hit the 'print' button, my Android phone puts the report in the body of an email so I can send it to the customer and CC: to my office.  Less paper = less stress in my world.  I'm a whole lot better at organizing electronic info than I am with pieces of paper.

will smith_4

combustion analyzers

We do a lot of combustion analysis work when working on boilers, and use a few different manufacturer's analyzers. I have to be honest when I say-I"m a bit leery about them. I've set up boilers using "company A's" analyzer, pulled up certain readings, and then tested the same burner with "company B's" analyzer-and found the readings to be totally different. Bear in mind these are testers that were both calibrated, and supposedly good to go. It's not a big deal if your CO reading is different by a few ppm (we always try to get CO down as low as possible), but if there is a discrepancy in O2 of 4-8%-well, which do you believe? Could be the difference between a boiler running fine and a boiler that soots up-and I've been on the losing end of that preposition.

Bottom line-we're all only as good as our meters-but how good are they?

rwhtg

great

i am going to check in to the sensor and maybe one of those c155 meters. thanx for the input