[PSUBS-MAILIST] Altimeter / barometer/ inclinometer

Wed Apr 22 15:24:58 EDT 2020

That was my concern that an altimeter wouldn't be as accurate as a digital
02 meter?
Rick

On Wed, Apr 22, 2020 at 8:24 AM Sean T. Stevenson via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

> A change in cabin pressure doesn't necessarily imply a change in oxygen
> fraction. Once the hatch is closed, any change in air temperature within
> the cabin will cause a pressure difference, as will any gas leaks into the
> cabin from air or oxygen bottles or plumbing, any change to the humidity of
> the cabin air (water vapour partial pressure), any biogenic gas releases
> from occupants, and any change to the internal volume of the cabin as a
> result of thermal contraction / expansion or deflection from external
> pressure.
>
> That's not to say that the altimeter is not a useful indicator. Certainly,
> the above sources generally result in small changes in comparison to oxygen
> consumption, but the simple fact that it is possible that the above sources
> can result in accumulated error means that confirmation of cabin oxygen
> level needs to come from another instrument that measures oxygen directly.
>
> Sean
>
> -------- Original Message --------
> On Apr. 22, 2020, 11:17, Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hi Hank
> Love your you tube videos.  I was wondering though what the altimeter
> would read in altitude vs like a reading of 19% when you are trying to keep
> it at say 21% or there abouts?
> Rick
>
> On Wed, Apr 22, 2020 at 7:03 AM hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Hi Rick. Yes that is how I operate all the time.  The altitude change
>> indicates if your O2 flow is correct
>> Hank
>>
>> Sent from my iPhone
>>
>> On Apr 22, 2020, at 10:16 AM, Rick Patton via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> 
>> Has anyone used an 02 gas chronograph/ 02 meter, as well as an altimeter
>> in their sub to note the readings in both to see what they both read at the
>> same time? Altitude vs PP02?
>> Rick
>>
>> On Wed, Apr 22, 2020 at 2:04 AM hank pronk via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>> David, I have a similar set up in E3000.  I have two not so fancy
>>> altimeters.  One is redundant.  I don't see why it matters what the
>>> pressure is.  The instrument is there to tell you if the pressure is
>>> increasing or decreasing.  It does look more cool though with psi on it.
>>> Mine are mounted to the hull with magnets (Brian got me hooked on magnets)
>>>  so I rotate the face to zero then rotate the altimeter so the needle is
>>> pointing strait up.  This makes it real obvious when there is a pressure
>>> change.
>>> Hank
>>>
>>> On Tuesday, April 21, 2020, 11:32:07 PM MDT, David Colombo via
>>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>
>>>
>>> Hi Tim, thats what intrigued me about this unit. Not to mention it had
>>> the inclinometer also. The thing I have been thinking is how to set psi
>>> chart and to use the rotating dial to set the altitude.
>>> David
>>>
>>>
>>> On Tue, Apr 21, 2020, 7:17 PM T Novak via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>> David,
>>>
>>> Do you plan to just zero the altimeter just prior to hatch closing?
>>> Makes sense.
>>>
>>> Tim
>>>
>>>
>>>
>>> *From:* Personal_Submersibles [mailto:
>>> personal_submersibles-bounces at psubs.org] *On Behalf Of *David Colombo
>>> via Personal_Submersibles
>>> *Sent:* Tuesday, April 21, 2020 4:04 PM
>>> *To:* Personal Submersibles General Discussion <
>>> personal_submersibles at psubs.org>
>>> *Subject:* [PSUBS-MAILIST] Altimeter / barometer/ inclinometer
>>>
>>>
>>>
>>> Hi guys, just got my altimeter for the SeaQuestor, which has a built in
>>> inclinometer. The dial face can rotate for altitude variance for diving at
>>> sea level or lake tahoe(elev 6225ft). The dial face can be set to determine
>>> if the barometric pressure is rising or falling. I am thinking to add Alex
>>> Smyth's label to be located between the altitude  and the orange  dial. Any
>>> thoughts about this?
>>>
>>> David.
>>> _______________________________________________
>>> Personal_Submersibles mailing list
>>> Personal_Submersibles at psubs.org
>>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>>
>>> _______________________________________________
>>> Personal_Submersibles mailing list
>>> Personal_Submersibles at psubs.org
>>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>> _______________________________________________
>>> Personal_Submersibles mailing list
>>> Personal_Submersibles at psubs.org
>>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>>
>> _______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>
>> _______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20200422/7fd80e2b/attachment-0001.html>