Chris and GS
Quote from Golf-Sierra:
As far as checking if there was water in the module prior to powering it up - would not the simplest way be to weigh it?
Nice one. Perhaps the experts can comment?
If i designed the "pressure vessel" i put a VERY SIMPLE SENSOR inside:
A humidity detector. There are several (one is VERY CHEAP) to implement it.
Electrically (using Ohms law) you EXTERNALLY check the electric resistance of a "sensor" inside the CSMU cylinder.
There are risks associated in powering up an electronic circuit contaminated by salt water.
My kids destroyed the processor area of an air band radio after a drop in a pool. ITHO if they washed and dried it before powering up very probably we saved the portable VHF.
The idea to weight is another possibility but may not indicate the presence of salt water moisture.