Re: [PSUBS-MAILIST] depth gauges

[Alex <spm2@nomad.ignorelist.com>]

There have got to be simple digital pressure gages available. Think of things
like a hydraulic pressure sensor that has a digital display on a machine. These
thing have got to be quite common, no?

Then you could get two digital sensors (one for backup), and then attach them
to a sea pressure pipe inside the pressure hull. Then you can get a regular
pressure gage that measures in PSI and then take the scale out and write your
own scale in feet on it and put it back in. You would have the 3rd pressure
gage as a backup in case the other two mismatch.

Alex


On 13-Nov-2009 Jon Wallace wrote:
> 
> Transducers for $125.00 in both current and voltage units.
> http://www.gaugestore.com/products.asp?dept=1652
> 
> I don't think these kind of transducers require a housing, do they?  
> Weld a 1/4 or 1/8 NPT coupling as a thru-hull and thread it in.  You 
> could even install a shutoff between the sensor and the thru-hull to 
> stop the water if the unit failed.
> 
> I also don't think a custom pc board is required unless there are lots 
> of parts involved.  I was able to build both a small preamp and amp for 
> the hydrophone projects using Radio Shack project pc boards (point to 
> point?).  It can get messy, but with a bit of planning you can actually 
> get alot of components on it.
> 
> I'm happy to follow up on dealer agreements if you have a suggested 
> supplier.  However, in most cases it's going to make more sense to just 
> do a bulk order and try to strike a price-reduction with the supplier.
> 
> Jon
> 
> 
> Al Secor wrote:
>> Jon,
>>
>> By the time we order custom PC boards and machine a housing for the pressure
>> sensor, the price difference would be much...if a user was able to do his
>> own pc board or point to point wiring on a perfboard  and machining for
>> housing, that would be different, but for a home-built kit ala "Heathkit",
> the pressure gauge you found would be the better route.  Maybe PSUBS could
> become a dealer and get a price break on them!
>>
>> I DO still plan to pursue the homemade version though if anyone DOES want to
>> go that route.
>>
>> Al
>>
>>   
> 
> 
> 
> 
> ************************************************************************
> ************************************************************************
> ************************************************************************
> The personal submersibles mailing list complies with the US Federal
> CAN-SPAM Act of 2003.  Your email address appears in our database
> because either you, or someone you know, requested you receive messages
> from our organization.
> 
> If you want to be removed from this mailing list simply click on the
> link below or send a blank email message to:
>       removeme-personal_submersibles@psubs.org
> 
> Removal of your email address from this mailing list occurs by an
> automated process and should be complete within five minutes of
> our server receiving your request.
> 
> PSUBS.ORG
> PO Box 53
> Weare, NH  03281
> 603-529-1100
> ************************************************************************
> ************************************************************************
> ************************************************************************
> 

-- 
Mailed with XFmail on 14-Nov-2009.
God saved Noah, but Noah had to build an ark!



************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
	removeme-personal_submersibles@psubs.org

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.

PSUBS.ORG
PO Box 53
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************