Theory of
Operation
The temperature you are firing to is called the target
temperature. After the controller reaches the target tem-
perature, it can also hold that temperature.
The controller fires at a controlled heating rate. The rate
is figured in degrees per hour. If you selected a rate of 100°
per hour, it would take 10 hours for the kiln to reach 1000°.
Rate is similar to “miles per hour.”
In summary, the controller does three basic tasks:
1) It fires at a controlled heating rate, or speed, mea-
sured in degrees of temperature change per hour.
2) It fires to a target temperature.
3) It can hold the target temperature.
The controller fires in segments, or stages. A segment is
a given heating rate to a target temperature. Shown above is
a segment with a rate of 625° per hour, a target temperature
of 1250°, and a hold of one hour.
Heating rate is figured in degrees per hour. The recom-
mended heating rate for the material you are firing is usu-
ally available from your supplier. It also varies depending
on the thickness of the material.
To figure how long a firing segment will take, subtract
the current temperature from the target temperature and
divide the resultant temperature by the heating rate. In the
diagram above, the firing time is 1250° - 80° (room tempera-
ture) = 1170 ÷625 = 1.87 hours.
The controller can fire up to 8 segments per firing. One
segment is often all that is needed, though.
After the controller has finished firing the last segment,
it will turn off power to the elements.
Note: If you enter a rate of 0000 in segment 1, or if the
target temperature in segment 1 is lower than the cur-
rent temperature,
will appear in the display.