[PSUBS-MAILIST] Optical Oxygen Sensors

[David Colombo via Personal_Submersibles]

Hi Alan, having had the second seat in the Gamma while at Flathead for the
expedition,  I monitored and logged the O2 readings through out the dives.
Start at hatch closure, upon reaching depth(up to 200ft+), at mid mark of
the planned dive duratation and again upon accent.The variation was minor
throught the dive.
David

On Tue, Aug 20, 2019, 3:23 PM hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alan,
> I can't speak to O2 level recovery with the hatch open after a dive, but I
> can say that working in the sub I have the CO2 metre on all the time if the
> sub is powered up.  The CO2 level does not come down in a noticeable rate,
> in fact, just working in the sub with the hatch open, levels are 2500 and
> up.  I would say in Gamma, the O2 level would not recover quickly.  That is
> why I calibrate my O2 meter outside the sub.
> Hank
>
> On Tuesday, August 20, 2019, 1:45:18 PM MDT, Alan via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Jon, Hank.
> It would be good if someone (Hank) could measure O2 levels in the sub
> & outside air to see how long it takes for them to reach an equilibrium.
> You may find that leaving the hatch open for a minute is all it takes.
> I am trying to build a smaller sub than the R300, so opening the hatch
> should
> be enough to equalise the O2 levels. Also with going smaller any
> environmental
> changes happen faster, hence the need for 3 X O2 sensors.
> Alan
>
> On 21/08/2019, at 12:24 AM, Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alan, almost all the rebreather galvanic sensors have quick disconnect
> adapters.  I think I'm going to deal with calibration by fabricating a
> small handheld analyzer that I can connect the same sensor to outside
> atmospheric air and then reconnect back to the main processor in the
> vessel.  The more I think of it, I will probably just make this handheld O2
> sensor a separate physical module that can run on it's own power and
> "plug-in" to the main processor.  For example, something like the "el
> cheapo" from oxycheq that could connect to and direct it's output to the
> main processor.  This approach would work for the CO2 sensor as well.
>
> Jon
>
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