[Rockhounds] Hi Temp Moisture Sensor

[J Bryan Kramer]

OK I have been without WIFI for a couple of days. But at 1000 or 2000
degrees you are no longer looking for water you are looking for steam, you
might even start getting some disassociation at the higher temp. That would
probably need a ir spectrometer type detector which would cost a LOT more
than she is interested in paying. The only other approach I can see is to
pump some air out, cool it to room temp and run more normal tests on the
room temp condensate.

More practically is to use weights, weigh the mold cold. Heat it for say 15,
30, 45, 60, 75 minutes. Cool it down and reweigh, when you get a constant
weight the water is gone. You'd have to use a fresh mold for each test. Then
just heat the molds for that time you determined ever after. There is no
cheap instrumental method that I know of.

BK

On Mon, Jul 7, 2008 at 2:17 PM, Gary Brown <gbrown at catspaw-minerals.com>
wrote:

> 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
>
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-- 
"Stand therefore, and fasten the belt of truth around your waist, and put on
the breastplate of righteousness."


J Bryan Kramer
North Florida, USA
photos at:
http://pbase.com/photoburner


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