[chbot] Filler for waterproofing temp sensors

[Charles Manning]

Anything that is rigid can easily leak when the plastic gets squished or
stretched or whatever.

I have never tried it myself, but I would think the liquid electricians
tape stuff could do the trick well. It forms a flexible coating.

I've taken a lot of different equipment diving in the past (lights, cameras
etc). I've had O-rings and stuff work fine at over 70 metres deep and many
people go deeper than that. I always gooped them in silicone grease too,
but that might not really be required.


On Fri, Jul 21, 2023 at 5:08 PM Andrew Errington <erringtona at gmail.com>
wrote:

> 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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