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SCUBA-L  December 1999, Week 2

SCUBA-L December 1999, Week 2

Subject:

Oxygen Analyzer Questions

From:

Lee Bell <[log in to unmask]>

Reply-To:

Lee Bell <[log in to unmask]>

Date:

Mon, 13 Dec 1999 11:21:35 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (44 lines)

Gadget fever has struck me again and I find myself desiring an Oxygen
Analyzer.  After spending considerable time searching the internet for
information, I find myself not much better off than I was at the start.
Accordingly, I'm seeking information from the pros who frequent this list
and from anyone else that has an opinion to offer.
 
What I'd like is information on what I should look for, what I should avoid
and what I should expect to have to pay.  Questions I know I have are:
1. Maxtec makes a "Handi" oxygen analyzer they advertise for scuba use.  It
looks like the unit is designed to fit a T-tube sampling device.  The unit
measures to the nearest whole % with a claimed accuracy of 3% of full scale
over temperature operating range, 2% at comstant temperature.  The unit
looks inexpensive.  Maxtec does not include a price on their online site.
Does anyone have an opinion on this unit?  Is a unit that measures to whole
percentages with the stated accuracy adequate?
2. I also found Underwater Brearthing Systems O2 Stick.  At least one list
member has one.  The sampling method is not apparent from online pictures.
The unit is priced at $256.  Any thoughts?
3. It seems that gas flow would impact measurement accuracy.  While I was
taught to use a T-tube sampler with a feathered valve, this seems like a
somewhat unreliable way to get consistent results.  Since the unit is
calibrated to air at rest but used to measure flowing nitrox, it would seem
that additional inaccuracy may result.  Any thoughts on this or on the best
cost efficient sampling method?
4. It would seem that the most reliable sampling method would be to test off
the low pressure inflator hose.  This would seem to ensure consistent flow.
Any thoughts on this?  Any ideas on how to best configure a sampling device
to do this?
 
As a final note, I'm considering constructing my own oxygen analyzer.  I got
directions from http://www.cisatlantic/com/trimix/analyzer/analyzer.htm that
seem to be viable for someone with my limited skills and more economical
than alternatives I've seen.  I'm probably going to give this a try, which
makes my question about sampling methods and flow measurement versus static
calibration just a bit more important.  For what it's worth, I'm also
planning on picking up a copy of the most recent edition of the Oxygen
Hacker book. Any thoughts?
 
Feel free to respond directly to me or to the list at your option.  I
suspect that I'm not the only one that would like to know more about this
subject.
 
Lee

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