[chbot] Filler for waterproofing temp sensors

[Mark Beckett]

The thermal cycling is a big issue.

We used to have antennas that had triple O ring and sealant and they 
sucked water in.

Cure was to drill a hole and add a long tube to stop the spiders ... no 
more water.


Mark B

On 21/07/23 16:50, Charles Manning wrote:
> Jasper, I am curious as to the pressure you subjected it to.
> Put it 20 meters deep in the ocean and I would not be surprised if it 
> leaks.
>
> On Fri, 21 Jul 2023, 16:46 Jasper Mackenzie, 
> <jasper.mackenzie at gmail.com> wrote:
>
>     I tried and tried with these and the I2C chips and water always
>     found a way in.
>     All the readily available options failed.
>     I suspect that potting material is the best bet.
>
>     Recent experience from some friends suggests that it is also the
>     heating and cooling pulling moisture down the wires.
>
>     My need is long gone, but I am interested to hear of your success
>     please!
>
>
>     On Fri, 21 Jul 2023 at 16:35, Charles Manning
>     <cdhmanning at gmail.com> wrote:
>
>         I have used epoxy and wax before. A lot depends on how
>         waterproof and how durable you want to achieve. You could also
>         use that liquid electrical tape stuff.
>         Not all epoxies are waterproof for a long period underwater.
>         Also consider that some materials are insulating and slow down
>         the readings.
>
>
>         On Fri, 21 Jul 2023, 14:04 Volker Kuhlmann,
>         <list57 at top.geek.nz> wrote:
>
>             I have a bunch of these capped metal tubes and a bunch of
>             temperature
>             sensors in TO-92 case. What is a good material to fill the
>             tube with
>             before pushing in the sensor, that is thermally
>             conductive? Epoxy glue?
>
>             Yes they are available ready-made on Ali (waterproof
>             DS18B20) but I
>             don't trust the sensor they use.
>
>             Thanks,
>
>             Volker
>
>             -- 
>             Volker Kuhlmann
>             http://volker.top.geek.nz/     Please do not CC list
>             postings to me.
>
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