[chbot] Filler for waterproofing temp sensors

[Martin Towers]

https://nz.rs-online.com/web/p/heat-shrink-tubing/1573818?gb=s
Lovely stuff. 

Martin



On Sat, 2023-07-22 at 17:16 +1200, Volker Kuhlmann wrote:
> Those are all really good points, thank you! I can be more specific.
> 
> Thermal conductivity between stainless sleeve and TO-92 should be
> good.
> 
> The metal sleeve ideally has thermal insulation to its clamping
> mechanism (not too difficult).
> 
> The metal sleeve and cable should be waterproof, ideally submersible
> to
> a few cm, but can be assumed to be <30° from the vertical with the
> metal down. Waterproofing of the sensor and its connection is not
> required as long as the packaging is waterproof.
> 
> That makes thermal grease in the sleeve look like a good option, even
> cheap from Ali should be good enough. TBC whether it's electrically
> insulating.
> 
> Heat shrink over tube and cable (I'm thinking flat(ish) telephone
> cable)
> doesn't seem enough to me, but I'm happy to also cover it in silicone
> sealant. That sealant is probably also a reasonably good thermal
> insulator.
> 
> What's your favourite supplier for silicone tubing, Andrew? (Don't
> search
> Ali for silicone sleeving, apparently one must be 18 for that).
> 
> And heat shrink lined with glue??
> 
> Thank you,
> 
> Volker
>