Being the sea, I assume the rate of change is very slow so speed of
conductance of the enclosure should not be an issue. Why not pot it in
something like a substantial diameter PVC pipe instead of a corrosive
metal? That said, my guess is it might be your wires and not the sensor
enclosure that is failing. It sounds like the RTV itself should be encasing
the sensor well even if the copper tubing fails. Telephone wire is thin and
could corrode easily or flex to failure with wave movement.
On Sun, Dec 8, 2013 at 3:31 PM, Håkan Elmqvist <hak...@smeden.org> wrote:
>
> I have for some years monitored sea water temperature with DS1820s and
> OWFS.
> I have soldered the sensors to a twisted pair telephone wire and put them
> into a short piece, ca 50 mm, of 12 mm of copper tubing. The tubes have a 3
> mm hole in the middle where I have injected normal RTV one component
> acetoxy-polymerising silicone. After that I have let the silicone skin to
> polymerise in air for a couple of days and then put them into the sea.
> The disadvantage of this seems to be the lifetime of the sensors, which
> seems to be around a year and a half.
> Now I have lost my third sensor (I have not done any post mortem) and
> would like a better method to protect the DS1820. The method must withstand
> ice.
> Any tip is appreciated.
> Håkan
>
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