I do this now for my aquarium.   Just get some Marine 2 part epoxy, and slather it all over the sensor and wire.  Just remember to label your wires *BEFORE* you encase it in epoxy to avoid a headache - unfortunately I speak from experience.  I sealed the wires too just to be safe and to avoid any chance of polluting my aquarium water with anything that may leech out over time.

You should be able to find the epoxy at your the local Menards/Lowes/Home Depot/etc.  It's not pretty, but just seal it up good and you are set.   The only real thing it does is slow the heat transfer time a bit, but you shouldn't notice unless you have drastic, short-lived temp changes you are trying to capture.

You can see mine here:
http://www.reefcentral.com/forums/showthread.php?s=b22a3dc0a91ed1d444f28e8a2d3a288a&postid=9379571#post9379571

-Scott




On 11/7/2008 1:56 PM, Donald J. Organ IV wrote:
Has anyone created a water temperature probe using the DS18S20?? I am assuming in order to do this I will need to encase it in some type of epoxy that will not effect the temperature readings.

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