I'm looking into building a temperature monitoring system, and I want the sensor to have the ability to be submersed into boiling water. Can a thermocouple handle this? I'm looking into this one now, but I'm not sure if it's waterproof.
My other idea would be to drop a small temperature sensor into an aluminum tube and seal it off.
Any ideas or suggestions?
EDIT: Sorry, I should have provided more context with my question. To clarify some things, the sensor will be used to monitor and control water temperatures ranging from 30F to 230F, not just to test when water is boiling :). Also, the water being monitored is consumable, so the sensor needs to be food safe as well, and since this is a hobby project, I'm trying to keep the sensor as cheap as possible.
Best Answer
Sealing it inside a tube would be ideal. The thermocouple you've linked isn't waterproof. You can buy thermocouple probes in sealed housings from several sources. One popular source fo industrial users is http://www.omega.com/guides/thermocouples.html .
Rolling your own is fine as long as you select good high temperature materials for the sealant.