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CO Calibration Bump Gas, and CO calibration

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CO Calibration Bump Gas, and CO calibration

Postby tursiops » Thu Mar 24, 2016 11:57 am

Do you have a recommended source for a bump gas? So far it seems like a reasonable price for a 10 liter bottle but almost as much for shipping....however if I calibrate twice it is still less than shipping it to you twice, and I can do it when I need it with no worries about shipping, delays, etc. And if several of us locally want to calibrate, the price amortizes pretty fast.

My issue is that my unit consistently shows 2-3 ppm CO, just sitting around in the ambient air, inside or outside. The smartphone-based option to have the CO offset auto-adjust when calibrating O2 does not seem to do anything.
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Re: CO Calibration Bump Gas, and CO calibration

Postby eDiver » Thu Mar 24, 2016 12:25 pm

tursiops wrote:Do you have a recommended source for a bump gas? ....

GasCo or MESA.

tursiops wrote:.....My issue is that my unit consistently shows 2-3 ppm CO, just sitting around in the ambient air, inside or outside. The smartphone-based option to have the CO offset auto-adjust when calibrating O2 does not seem to do anything.

What CO level do you get when analyzing a known good tank?
If you leave in a big city and next to a major highway you could get those CO levels in ambient air.
The DiveNav Team
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Re: CO Calibration Bump Gas, and CO calibration

Postby tursiops » Thu Mar 24, 2016 12:47 pm

I get 2-3 ppm for all my tanks filled with air or nitrox. My O2 tanks give 0, as i remember.
Yes, I'm not that far from an interstate.

Tell me more about the auto-adjust CO offset feature. Does it work for non-smartphone calibrations? Does it work for O2-gas calibration, or just for air calibration, with the smartphone?
tursiops
 
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Re: CO Calibration Bump Gas, and CO calibration

Postby tursiops » Thu Mar 24, 2016 12:49 pm

For purchasing a bump gas, does it matter if it is CO and N2, or is CO and air better?
I assume i need a regulator with any bump gas cylinder?
tursiops
 
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Re: CO Calibration Bump Gas, and CO calibration

Postby eDiver » Thu Mar 24, 2016 1:52 pm

tursiops wrote:For purchasing a bump gas, does it matter if it is CO and N2, or is CO and air better?
I assume i need a regulator with any bump gas cylinder?

We recommend CO and Air.
Yes, you will need a regulator.
The DiveNav Team
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Re: CO Calibration Bump Gas, and CO calibration

Postby eDiver » Thu Mar 24, 2016 3:33 pm

tursiops wrote:I get 2-3 ppm for all my tanks filled with air or nitrox. My O2 tanks give 0, as i remember......

Could you please verify / confirm that you get 0 ppm when analyzing an O2 tank?
Do you get the Air / Nitrox tank filled at the same place? Or from different dive stores?
The DiveNav Team
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Re: CO Calibration Bump Gas, and CO calibration

Postby eDiver » Thu Mar 24, 2016 3:36 pm

One more thing, could you please send us a memory diagnostic (at least 64K ... it might take a while)?

Thanks
The DiveNav Team
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