CO Analyzer

[49north]

Does anyone have any recent feedback on the Cootwo analyzer? In reading through the threads, it seems like there have been some issues with inaccurate CO readings. This being a new product, I can't help but wonder if there are some bugs that need to be sorted out.

Does anyone have any experience with the Nuvair De Ox analyzer? It is considerably more expensive and the replacement sensors are almost 4 times the price. Is it that much better?

Are there any other analyzers worth considering?

Thanks!

 

[grf88]

OxyCheq have a unit you might want to look at.
OxyCheq - OxyCheq Expedition CO Analyzer w/ Alarm

 

[tbone1004]

the Cootwo is perfectly fine, there have been some wonky sensors that have gone out, but have been replaced. No different than any other analyzer since they all use the same sensors. No way I'd spend the money for the Oxycheq when the cootwo is cheaper and does more.... Perfectly happy with mine and per the vast majority that our out there, it is accurate

 

[49north]

the Cootwo is perfectly fine, there have been some wonky sensors that have gone out, but have been replaced. No different than any other analyzer since they all use the same sensors. No way I'd spend the money for the Oxycheq when the cootwo is cheaper and does more.... Perfectly happy with mine and per the vast majority that our out there, it is accurate

Will the unit still function if the CO calibration expires?

How much does it cost to get reference gas and a regulator to calibrate yourself? Where do you get this?

 

[rhwestfall]

@DiveNav - Alberto should chime in here now.....

(I'd also like to know what is the recommended CO/Air mixture (% or ppm) for calibrating)

 

[tbone1004]

Will the unit still function if the CO calibration expires?

How much does it cost to get reference gas and a regulator to calibrate yourself? Where do you get this?

it should still function normally, though Alberto may be able to give a better answer for that that I can. You can find bump gas in a myriad of places, but here's a convenient one. $30 and should last a few years of calibration
OxyCheq - 15 PPM CO Bump Test Calibration Gas

 

[49north]

it should still function normally, though Alberto may be able to give a better answer for that that I can. You can find bump gas in a myriad of places, but here's a convenient one. $30 and should last a few years of calibration
OxyCheq - 15 PPM CO Bump Test Calibration Gas

That doesn't seem bad! Thanks!

What would you use for the 0 PPM part of the calibration? Could you use pure oxygen or would that somehow mess up the O2 sensor?

 

[tbone1004]

pure o2 won't mess up the sensor since it is typically combined with an o2 sensor to measure pure o2.

for bump gas, I'll probably just go to our lab at work and use some calibrating gas from there, not sure where 0ppm bump gas would be easy to find unless you have access to liquid o2, co2, or something similar

 

[49north]

Do you think welding grade O2 would work?

 

[tbone1004]

not sure, haven't checked them. It might be depending whether they are vacuumed out or not. Either way you have 12 months to figure it out :-D