This post is a general overview of how to make your electronics more water resistant,
including a PVC housing system that anyone can build with hardware store parts: https://thecavepearlproject.org/2023/03/17/waterproofing-your-electronics-project/
with photos of how to oil-mount pressure sensors for those housings.
Thank you for posting that 
I found it interesting and enlightening. I will have to revisit it all again after my initial read.
I have the intention to produce some stuff for SCUBA diving and I've bought some MD-PS002 (up to 100PSI (6.8 bar) )pressure sensors to monitor pressure / depth. One thing I was wondering was how to couple the pressure sensor to the water pressure and to protect them.
My expectation was to encapsulate everything else and was considering paraffin wax over a conformal coating from early version. I was anticipating melting off the paraffin wax for the inevitable hardware re-works!
PS The SCUBA kit is only for monitoring and my amusement, not for diver safety. In my case I have a commercial dive watch/computer.
A useful post, again thanks. Steve
Those PS002's are incredibly cheap, but luke millers libraries for the MS5803 worked so well we went with the more expensive I2C option as I had so many other things to juggle in dev. The MS5803's have been our go-to pressure sensor since the beginning of the project. We usually get a couple of years out of them with 'raw' exposure in calm fresh water but generally not much more than a year in full marine environments with wave action. Hypersaline environments can destroy the little gel-caps in a little as 3 months which is another reason we started mounting them under oil. Just starting to use the MS5837's now as they are only about $10 pre-mounted on eBay, but haven't any long deployments on them yet.
Thank you for the additional information.
I will not be producing for a commercial product - just for my own amusement.
I see from the Mouser page for the MS5837, that they list application as diving computer. I'll try what I have and see how much progress I make They have a handy 5 bar range, ideal for the bulk of SCUBA diving.
I thought that after retiring from nearly 50 years in electronics and the majority of that as a hardware design consultant that I would have loads of time to investigate some more of my own ideas. I am now as busy as ever and have so little 'spare' time. One of my aims was to improve my poor coding ability. I have designed many embedded systems and always worked alongside software engineers, who have always been much speedier than me in codiing etc.
Again, thanks for your added time and effort in replying, Steve
We needed a way to test our little falcon tube loggers and household water filter housings are a good solution as the domestic water pressure range of 40-80psi overlaps nicely with sport diving depths. And I finally got around to testing a 'naked' Arduino in a bag of mineral oil. Only took it to 80psi/ 55m depth equivalent - but it handled the pressure just fine. Only problem was that I damaged the coin cell battery by 'decompressing' the unit too fast at the end of the test:
Thank you for the post
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