<div dir="ltr"><div>Anything that is rigid can easily leak when the plastic gets squished or stretched or whatever.</div><div><br></div><div>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.</div><div><br></div><div>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.</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jul 21, 2023 at 5:08 PM Andrew Errington <<a href="mailto:erringtona@gmail.com">erringtona@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div>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.</div><div dir="auto"><br></div><div dir="auto">Andrew <br><br><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">On Fri, 21 Jul 2023, 16:55 Mark Beckett, <<a href="mailto:m.beckett@amuri.net" target="_blank">m.beckett@amuri.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p><font face="Candara">The thermal cycling is a big issue.</font></p>
<p><font face="Candara">We used to have antennas that had triple O
ring and sealant and they sucked water in.</font></p>
<p><font face="Candara">Cure was to drill a hole and add a long tube
to stop the spiders ... no more water.</font></p>
<p><br>
</p>
<p><font face="Candara">Mark B</font><br>
</p>
<div>On 21/07/23 16:50, Charles Manning
wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">Jasper, I am curious as to the pressure you
subjected it to.
<div dir="auto">Put it 20 meters deep in the ocean and I would
not be surprised if it leaks. </div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, 21 Jul 2023, 16:46
Jasper Mackenzie, <<a href="mailto:jasper.mackenzie@gmail.com" rel="noreferrer" target="_blank">jasper.mackenzie@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<div>I tried and tried with these and the I2C chips and
water always found a way in.</div>
<div>All the readily available options failed.<br>
<div>I suspect that potting material is the best bet.</div>
<div><br>
</div>
</div>
<div>Recent experience from some friends suggests that it is
also the heating and cooling pulling moisture down the
wires.</div>
<div><br>
</div>
<div>My need is long gone, but I am interested to hear of
your success please!</div>
<br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, 21 Jul 2023 at
16:35, Charles Manning <<a href="mailto:cdhmanning@gmail.com" rel="noreferrer noreferrer" target="_blank">cdhmanning@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="auto">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.
<div dir="auto">Not all epoxies are waterproof for a
long period underwater. Also consider that some
materials are insulating and slow down the readings. </div>
<div dir="auto"><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, 21 Jul 2023,
14:04 Volker Kuhlmann, <<a href="mailto:list57@top.geek.nz" rel="noreferrer noreferrer" target="_blank">list57@top.geek.nz</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I have a bunch of
these capped metal tubes and a bunch of temperature<br>
sensors in TO-92 case. What is a good material to fill
the tube with<br>
before pushing in the sensor, that is thermally
conductive? Epoxy glue?<br>
<br>
Yes they are available ready-made on Ali (waterproof
DS18B20) but I<br>
don't trust the sensor they use.<br>
<br>
Thanks,<br>
<br>
Volker<br>
<br>
-- <br>
Volker Kuhlmann<br>
<a href="http://volker.top.geek.nz/" rel="noreferrer
noreferrer noreferrer noreferrer" target="_blank">http://volker.top.geek.nz/</a>
Please do not CC list postings to me.<br>
<br>
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