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5
Rate
Each segment must include a rate, which is degrees of
temperature change per hour.
The kiln will fire at full power when the rate is
1799°F/999°C. Full power displays as
.
Note:
To enter full power from
, press the
key once.
Hold
Hold is the length of time that you want the kiln to remain
at the target temperature. Hold is also called soak or dwell
time. Hold maintains a steady temperature for the length of
time you specify. You can use Hold in both heating up and
cooling down segments.
When Hold is set to 99.59 hours, the controller will re-
main at that temperature indefinitely, until you press
.
To enter a 99.59 hour Hold, press the
once
from 00.00 during programming.
Note:
During firing, the display shows Hold tem-
perature and time left in Hold.
Temperature Over-Shoot
When a kiln is heated too fast, it may over-shoot the target
temperature, especially in small kilns at lower temperatures.
To avoid this, add an extra segment in a User Defined pro-
gram to slow the firing.
User Defined
Programs
Theory of Operation
The temperature you are firing to is called the target tem-
perature. After the controller reaches the target tempera-
ture, 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, measured
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 target temperature of 1250° and a rate of
625°, with 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 usually
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 temperature) =
1170 ÷625 = 1.87 hours.
The controller can fire up to 8 segments per firing in a
User Defined program. One segment is often all that is
needed, though.
After the controller has finished firing the last segment of
a User Defined program, it will turn off power to the kiln.
Note:
If you enter a rate of 0000 in segment 1, or if
the target temperature in segment 1 is lower than
the current temperature,
will appear in the
display.