Ann Semple on tue 5 mar 02
I meant probe not sitter!
I wrote:
In my first firing of my new kiln, I discovered that the temperature displayed on the controller and the bending of the guard cones differed significantly . I suspect the only way to resolve this is to calibrate the sitter , and recalibrate as it ages.
I was going to set up a series of cone packs one behind the other on each level, and record the controller temperature when they bend. Is this a reasonable way to proceed or are there better ideas out there?
Ann
annsemple@shaw.ca
Les Haworth on wed 6 mar 02
Dear Ann, I had almost finished my E-mail to you when I read Steve Mills
letter. I agree! But Steve explained it like I wish I could have. Well done
Steve. Les H.
Lester R. Haworth III
Sales and Technical Support
Laguna Clay Co.
14400 Lomitas ave
City of Industry, CA 91746
1(800) 4-LAGUNA ext. 229
les@lagunaclay.com
www.lagunaclay.com
When I was in elementary school my teacher pinned a note to my shirt for my
parents to read. It said, 'Charlene is not coloring inside the lines.' My
parents contacted the teacher and asked the teacher what the purpose of
coloring inside the lines was.' The teacher didn't quite know what to say,
except that the direction she had given was to color inside the lines. My
dad told me to color any way I wanted to and when I was done coloring, to
draw a black line around my picture." Charlene Felos, Ceramics Instructor -
Cypress College
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
Behalf Of Steve Mills
Sent: Wednesday, March 06, 2002 3:02 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: [CLAYART] callibration of kiln sitter
Dear Ann,
The difficulty you are going to come up against is that Pyrometers (in
the controller) and cones measure 2 very different things: Controller
displays/Pyrometers measure the temperature in the kiln at the precise
moment you look at the display. Cones measure accumulated heat work over
the length of the firing up to the point when they bend. In that respect
they behave like the materials that go to make the pot/glaze, which is
why they remain firm favourites with an awful lot of Potters. What you
can do is set the finishing point way past the temperature that you
want, and fire watching the cones. When they bend, make a note of the
temperature reading, and set the controller to that point for that
programme for future firings. You will occasionally need to put a cone
into a firing to confirm that all is working as it should.
This is the technique we recommend to our customers when they buy a new
controller operated Kiln from us and want to confirm its *accuracy*.
Steve
Bath
UK
In message , Ann Semple writes
>In my first firing of my new kiln, I discovered that the temperature disp=
>layed on the controller and the bending of the guard cones differed signi=
>ficantly . I suspect the only way to resolve this is to calibrate the sit=
>ter , and recalibrate as it ages.
>I was going to set up a series of cone packs one behind the other on each=
> level, and record the controller temperature when they bend. Is this a r=
>easonable way to proceed or are there better ideas out there?
>TIA for any advice.
>Ann
>annsemple@shaw.ca
--
Steve Mills
Bath
UK
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