Just another thought is that mercruiser sternleg parts have a Tilt position sensor which should be a lot cheaper and I am going to use these also but fill with oil by drilling a hole in the top case and then putting a cheap rubber bung in too stop the oil leaking out. These have a small pot inside and O’ring sealed leads. Quit a nice little unit. You should be able to pick them up from a local boat shop. Hugh
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Cliff Redus
Sent: Sunday, 4 September 2011 10:30 a.m.
To: personal_submersibles@psubs.org
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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