[PSUBS-MAILIST] Altimeter / barometer/ inclinometer

[T Novak via Personal_Submersibles]

David,

 

As Hank mentions it is probably not relevant what units your altimeter displays, psi or feet above/below sea level. Unlike water depth, atmospheric pressure is not linear.  The ICAO standard atmosphere has sea level pressure as 14.7psi and 10.2psi at 10,000 feet asl. The altitude displayed on your gauge should provide a reasonably precise indication of cabin pressure change.  I hope that your conversion requirement does not slow down your installation and operation plans.

 

Tim

 

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of hank pronk via Personal_Submersibles
Sent: Wednesday, April 22, 2020 5:04 AM
To: David Colombo via Personal_Submersibles <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Altimeter / barometer/ inclinometer

 

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 <mailto: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 <mailto: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 <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 <mailto: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.

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