19
1. Values for S, H, and L can be
changed without interrupting the
program sequence:
– Select the desired parameter with the
arrow keys and enter the new value.
Confirm with ENTER.
2. To change set data for B, t➚, V
1
, and V
2
:
– Press STOP
– Select the desired parameter with the
arrow keys and enter the new value.
– Confirm with ENTER.
– Press START
Interrupting a program
Press STOP once.
The program is interrupted.
Stopping a program
Press STOP twice. The program is completely
stopped and the vacuum released.
6.5 Controlling the CTE
The CTE (coefficient of thermal expansion)
of the ceramic material can be controlled as
follows:
1. Immediate removal of the object after
firing causes a reduction of the CTE
(minus)
2. Slow cooling of the object in the furnace
after firing (long-term cooling) causes an
increase in the CTE (plus)
Long-term cooling can be influenced by
adjusting the parameter L (79).
Set the desired cooling value
in °C/°F. This temperature
determines when the furnace
head is opened (e.g. at 700 °C).
6.6 Additional practical information
– Always keep the furnace closed between
firings.
– Optimum results can be obtained with
Ivoclar silicon nitride firing trays.
– Objects to be pre-dried should be placed
on the firing plate only after the buzzer
has sounded (<320 °C / <608 °F)
– A power failure (> approx. 10 s) during
a program in progress will interrupt the
program and cause Err 17 to appear.
Press STOP and restart the program. The
program starts at the beginning (any
adverse effect on the object depends on
how long the power failure lasted).
– Check the furnace temperature with the
'Silver Test'.
– Do not open the furnace head manually
when the furnace is switched on.
Err 28 will otherwise be indicated.
– Note: Altering the parameters during a
program in progress may result in the
program being stopped (with an error
message being displayed).
– If the furnace is switched on with the
furnace head closed and the actual
temperature in the furnace higher than
600 °C (1112 °F), the furnace head
completely opens and closes again during
the self-diagnosis.
– Remaining time indicator (70):
After the program has been started, the
remaining time indicator (70) displays
the estimated remaining time until the
program is completed.
The remaining time appearing on the
display is continuously updated during
the program sequence (every 5 s.).
The indicated time, however, is only an
approximate value. It is not possible to
determine the exact remaining time, for
example, during long-term cooling, during
vacuum build-up, or if the set temperature
increase is not achieved.
The remaining time indicated is
only an approximate value that is
continuously updated during the
program sequence.
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