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Cliff,
I opened a pdf on the link you
gave & it stated under environment,
that it had an IP68 rating (tested 2M for 2 hours).
I'm not sure what the IP68
rating is, as another site selling small boxes,
stated that their enclosure was IP68 & suitable for up to 300M.
There were smaller magnetic rotary
potentiometers than the one I bought. I went for the largest so I could
mount
it with a rotating shaft through it's
centre.
Regards Alan
----- Original Message -----
Sent: Sunday, September 04, 2011 1:37
PM
Subject: Re: [PSUBS-MAILIST] Postion
Sensors for marine service
This looks like it could handle the pressure and the marine
environment. It is to big by a factor of four for my
applications. Also I need something that is rugged as the
location where two of these sensors is on my jet pump and exposed
to abuse.
I looked at the vendor web site for the pot and they seem to have only the
one size for the rotary pot.
Thanks for the info.
From: Alan James
<alanjames@xtra.co.nz>
To:
personal_submersibles@psubs.org
Sent: Sat, September 3, 2011 7:51:10
PM
Subject: Re:
[PSUBS-MAILIST] Postion Sensors for marine service
Hi Cliff,
I made up a position sensor & had the
electronics sorted for it to run a bar graph from a 12 volt supply.
It's on my projects page.
http://www.psubs.org/projects/1235435392/positionsensor/
It's based on a rotary magnetic potentiometer
that I've glued acrylic to & potted the wires.
In theory it should go thousands of meters. You need a rare earth magnet
of sufficient strength to operate it.
Regards Alan
----- Original Message -----
Sent: Sunday, September 04, 2011 10:30
AM
Subject: Re: [PSUBS-MAILIST] Postion
Sensors for marine service
I have my boat torn down and am in the process of adding some
external position sensors for my control surfaces. Specifically, I am
looking for a small rotary potentiometer (or equivalent) that is rated for
400 fsw. I found a sensor NRH280 from Penny+Giles
http://www.pennyandgiles.com/Dual-Output-'No-Contact'-Rotary-Position-Sensor-pd-483,3,29,.php that
looks promising. The spec on this meets the IP69K standard which is
designed to withstand high pressure wash-downs at high temperature.
IP69K testing involves subjecting the sensor to steam generated
from 100 bar water pressure. These sensors cost $157 and
has a six week lead time. Does anyone have any experience with
this sensor or with the IP69K spec? What I am trying to determine is
will this sensor handle 200 psig external water pressure? While the
IP69K spec does not directly address external pressure, it is a fairly
demanding test standard so any device that passes this standard should be
able to handle some external pressure but the question is how much? The
vendor has no data that they are willing to share on maximum external
pressure their sensor can withstand. If all else fails, I can buy one
of the sensors and do a bench test to failure but this will take 13 weeks to
get the parts assuming it takes six weeks to get the test unit , one week to
test and six more weeks to get the remaining sensors assuming the unit
passes the test.
Alternately , does anyone know of any off the shelf small rotary
potentiometers that are designed for this service? My goal is to mount
one of these sensors on my yaw, roll and pitch control surfaces and then
bring the electrical leads into the boat through an electrical
penetrator. Any thoughts.
Cliff
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