[chbot] Filler for waterproofing temp sensors

Fri Jul 21 10:52:47 BST 2023

Heat shrink tubing that comes ready lined with glue makes a good seal
to round cables.

On Fri, 2023-07-21 at 19:45 +1200, Charles Manning wrote:
> 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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