[Rockhounds] Hi Temp Moisture Sensor

[Gary Brown]

Not rockhound... But there sure a bunch of clever folks here.

One of my glass buddies is looking for a moisture sensor that will operate
inside of a 2000F kiln.  Here's the application:  she creates molds out of a
plaster/silica/gunk mix that contains water.  She's got that inside a kiln
along with a load of glass that will eventually fill the kiln.  An
electronic controller controls (what else would a controller do, eh?) the
time & temperature of the kiln.  In this case, she wants to heat the kiln
and have it sit at, say, 1000F until the moisture in the mold bakes out.
When that happens, the moisture in the air inside the kiln should drop.
When that drop occurs the kiln resumes heating up to the full melt
temperature.

The fly in the ointment is finding a moisture sensor that can survive 2000F.
Any suggestions?

GcB