That's slick, but copper in aquariums is a big no-no. High-end
freshwater or saltwater reef aquarium inhabitants like corals and
invertebrates can not tolerate copper.
I encased my sensors in epoxy to avoid water contact. Just solder up
the sensor, mix up some 2-part epoxy, and smear it over the chip and any
wire that will be in the water. I put on 2 "coats" just to sure it's
water proof. I've found it works well for sensing temperature - they
aren't pretty, but they track temps just fine.
http://bytality.com/gallery/1-wire_setup/
As far as 85°C, my temp collection script takes a series of readings and
then tosses any that are outside a predefined distance from the
average. Granted, my aquarium should never hit anywhere near 85°C, but
it got rid of my errant readings.
-Scott
On 3/2/2011 4:04 PM, nick wrote:
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 <[email protected]
<mailto:[email protected]>> 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.
>
> --------------------
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