Lou Roess on sun 5 dec 04

On Dec 4, 2004, at 11:22 PM, Frank Gaydos wrote:

> My computer controled J-230 L&L kiln fires too hot at every setting.
> It is about half a cone off on the hot side.
> Is there a way to recalibrate the factory installed peak tempt?
>
>
Frank, yes it's outlined in your owners manual. Also, L&L's rep Robert
is very knowledgeable and will walk you through it . He has always
been very helpful when I called him. I've been very impressed with
their tech support. There's an 800 number.
Regards, Lou in Colorado

Arnold Howard on mon 6 dec 04

The early temperature controllers did not include temperature calibration.
If the witness cone didn't bend far enough in Cone-Fire mode, you added hold
time or fired to the next cone. If the cone puddled, you fired to the next
cooler cone.

In around 1995, Bartlett added a calibration adjustment in Cone-Fire mode.
But some people complained that calibrating one range of cones threw other
cones out of adjustment. So Bartlett came out with a second type of
calibration that adjusted only individual cones.

On the Bartlett and Orton controllers, you can adjust the temperature of a
narrow range of cones with Cone Offset. The adjustment affects only firings
in Cone-Fire mode. Or you can make a general calibration that affects all
firings in both Cone-Fire and Ramp-Hold. That adjustment is called
Thermocouple Offset.

(The calibration methods and terms vary depending on the kiln brand and the
series of controller. But the principles are the same.)

Temperature calibration is useful if you use Cone-Fire mode (the type of
firing where the controller asks for cone number instead of temperature).
However, be prepared to make another adjustment when the thermocouple begins
to drift in temperature. An easy way to deal with temperature drift is to
add hold time.

I wouldn't bother with temperature calibration in Ramp-Hold mode (the type
of firing where the controller asks for temperatures instead of a cone
number). It is simpler just to change the firing temperature than to
recalibrate the controller. If, however, you are using Ramp-Hold mode and
also have an S-Type thermocouple, then temperature recalibration would be
useful, because the S-Type has virtually no temperature drift. So you would
make only one temperature recalibration.

By the way, if the temperature is off by 25 degrees F or more, the
thermocouple is probably about to fail.

Sincerely,

Arnold Howard
Paragon Industries, L.P., Mesquite, Texas USA
arnoldhoward@att.net / www.paragonweb.com

----- Original Message -----
From: "Frank Gaydos"
My computer controled J-230 L&L kiln fires too hot at every setting. It is
about half a cone off on the hot side.
I tried to fire at one cone lower but that was just too cool. I have
another, larger L&L computer kiln and it fires cooler at the same setting.
(I'm placing large stand alone 04 cones in the kilns to get readings.)

Is there a way to recalibrate the factory installed peak tempt?

billBUCKNER on mon 6 dec 04

Frank:

There are several calibrations you can program into the controller. Look at
the kiln's manual (or check the L&L website) for instructions. You can
correct for specific cone end points - which sounds like the option you need.

Cheers,
-Bill Buckner
Atlanta


At 12:00 AM 12/6/2004, you wrote:
>Date: Sun, 5 Dec 2004 01:22:46 -0500
>From: Frank Gaydos
>Subject: L&L kiln too hot
>
>My computer controled J-230 L&L kiln fires too hot at every setting. It =
>is about half a cone off on the hot side.
>I tried to fire at one cone lower but that was just too cool. I have =
>another, larger L&L computer kiln and it fires cooler at the same =
>setting.
>(I'm placing large stand alone 04 cones in the kilns to get readings.)
>
>Is there a way to recalibrate the factory installed peak tempt?
>
>PS This might be a good subject for some tech person to write a how-to =
>article in CM.
>Frank Gaydos
>
>Garlic is to food what insanity is to art.
> Anonymous

billBUCKNER
www.sodaglaze.com

"Life's journey is not to arrive at the grave safely in a well preserved
body. But, rather to slide in sideways, totally worn out, shouting... Holy
$*^#. What a ride !!!" -Author unknown