> The easy solution to this is to simply pot any one of the sensors
recently
> discussed on this list.  Two part epoxy putty makes a good potting
compound.
> Silicon RTV can also be used. Once you waterproof the electronics with
putty you
> can monitor the temperature of all fluids that are not solvents for the
putty.

You should use thermally conductive epoxy for any accuracy at all.
Electronics mfrs sell it, I've seen it in EEM and am sure it can be sought
out on the net.

Bruce