[chbot] Filler for waterproofing temp sensors

[Andrew Errington]

I did the reverse. I didn't trust the potting, so I used silicone tubing
with a 6mm ID. The sensor and wire goes inside the tubing. The metal cap
containing the sensor pokes out a little from the end of the tube. The
inside of the tube is sealed against the outside of the cap, because the
tube is stretched a little, but you could put a cable tie or whipping knot
around it.

Andrew

On Fri, 21 Jul 2023, 16:55 Mark Beckett, <m.beckett at amuri.net> wrote:

> 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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