I don't know of these as standard but companies like Remote Marine
Systems who make system that will fit the bill. I've seen their
non-contacting valve angle sensors used sub-sea and on board cable
Would be worth dropping them a line... details here www.rmsltd.com
Don't be put off by the website, now a James Fisher & Sons PLC they have
a long history in Nuclear and Offshore industries.
hope this helps.
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