Waterproofing the LM335Z
To waterproof the LM335Z, I used heat shrink tubing. After soldering the leads of the package to stranded hook-up wire, I put heat shrink tubing over the leads and shrank them with a lighter. Then, I covered the whole package with a larger piece of heat shrink tubing and shrank it. Finally, to cover up and gaps and fill in the hole left at the end, I coated the seams in hot glue.
Although I broke out two of the three leads, I wish I used all three. The third lead is the "adjust" lead which is used for calibration. Although the LM335Z was accurate when plugged into my breadboard, the long (about 2m) leads added a lot of noise to the signal which became my first design's downfall.
In the next part, I will show the final design.