|
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.
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
|