Do you have any links to possible optical sensors rated for submergence in sea water?
From: "ojaivalleybeefarm @dslextreme.com" <ojaivalleybeefarm@dslextreme.com>Sent: Sun, September 4, 2011 8:18:54 AM
Subject: Re: [PSUBS-MAILIST] Postion Sensors for marine service
Cliff, What about some type of optical sensor? Maybe utilizing ledsJust a thought.BrianOn Sat, Sep 3, 2011 at 6:37 PM, Cliff Redus <cliffordredus@sbcglobal.net> wrote:
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> 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.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 -----From: Cliff RedusSent: Sunday, September 04, 2011 10:30 AMSubject: Re: [PSUBS-MAILIST] Postion Sensors for marine serviceI 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