Here are my water proof sensors using copper pipe and HMA, they have worked well so far.
http://kiwi-hacker.blogspot.com/2011/01/new-soil-temperature-sensors.html On Wed, Mar 2, 2011 at 9:57 PM, Mick Sulley <m...@sulley.info> wrote: > On Wed, 2011-03-02 at 09:18 -0600, Guil Barros wrote: > > > Hhmmm. Interesting. Tips like these is exactly what I am after, so > thanks a > > > bunch for that. > > > > > > I like the idea of covering the sensor (or parts of the sensor and the > PCB) > > > with silicone. Do you remember what specific product you used (was it a > > > spray, or just one of those tubes you buy at HomeDepot or Lowe's that > you > > > apply with a gun)? > > > > Yes, I just got a tube of silicone I had laying around the house and > > encased the whole thing in it. If I remember the tech sheet correctly, > > the newer DS18b20's are entirely waterproof (old ones had issues) so > > you really only need to encase the leads. I did the whole thing as the > > sensor is pulling the temp read off of the ground wire anyways so > > might as well be safe. > > > I have several sensors out on the roof monitoring solar panels. I use 3 > core 0.75mm high temperature cable, solder the DS18S20 to the end with > small heat shrink sleeves over the pins, then use another heat shrink > over the top and onto the outer of the cable, but filled it with epoxy > resin, squeeze the air out, refill, etc, then when I thought all the air > bubbles were out used a paint strip gun to shrink the sleeve. It is > slow and very messy but I think I have got weather proof sensors as a > result. > > > > > I also like the idea of using wax. I obviously had not thought about > it. I > > > suppose that in that case you melt the wax (like from a candle) in a > pot and > > > then dip the PCB into it. Is that they way people would do it? > > > > I've seen it done for potting electronics on ROV's. In that case they > > had the electronics in a small plastic enclosure and just filled the > > enclosure with wax when done. > > > > > I also found about "conformal coating" while doing some searches last > night. > > > Guess that is the official name of what I am after. There are products > to do > > > conformal coating, although nothing you can find at your local hardware > > > store, which is why I'd prefer to go with one of the two methods you > > > mentioned. > > > > I think thats what Hobby-Boards uses, might be worth sending them an > email. > > > > -------------------- > > > > ------------------------------------------------------------------------------ > Free Software Download: Index, Search & Analyze Logs and other IT data in > Real-Time with Splunk. Collect, index and harness all the fast moving IT > data > generated by your applications, servers and devices whether physical, > virtual > or in the cloud. Deliver compliance at lower cost and gain new business > insights. http://p.sf.net/sfu/splunk-dev2dev > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers >
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