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The problem is that in general, thermistors have a non-linear
Ohms/degree curve.  To handle that, you can either
a) accept non-linear response,
b) use hysteresis instead,
or c) go through the incredibly complex calculations to determine the
temperature from the resistance.

As to using the LM35 in a liquid measurement situation, I would go
for something like this:

1)Find a short (no more than a cm or two) piece of brass tubing that
is only slightly larger than the diameter of the curve of a TO-92
package.
2)Get some small silicone tubing that will fit over the brass tubing
3) Fill one end of the brass tubing with epoxy to create a seal
4)Insert something like heatsink grease , adding just enough that the
TO-92 package has a good thermal contact to the sides of the tubing.
5)Solder wires to the LM35, and heatshrink any bare metal
6)Slide the silicone tubing over the wires to the LM35
7)Insert the LM35 into the brass tubing witht he heatsink grease
8)Push the silicone tubing over the brass tubing, creating a seal,
but not going over the area occupied by the LM35
9)Now, install it anywhere that you want, within a cooling system.
You have a sealed temperature measurement device.  I wouldn't
recommend this for anything near food, though.

There's probably a simpler way of doing that, but that's what came
off the top of my head.

- --Brendan
- ---
"Rejection out of hand of all but one's favoured alternative may cost
you dearly in one way or another." -Russell McMahon



> How would I handle the thermistors (i don't think i can use
> anything like a LM35, as I need to read water temperatures, unless
> somebody knows how to use a LM35 to read water temps...)?

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