Test Programs; Stand-By; Temperature Calibration - Ivoclar Vivadent Programat CS4 Operating Instructions Manual

7.4 Test programs

Press the Settings key and scroll to the desired test program using
the cursor keys.
Heater test program
The heater test automatically checks the heating system. The test
should only be performed with the sintering chamber empty, since
any mass placed in the furnace (e.g. sinter tray) would influence the
result.
Keypad test program
Each pressing of a key results in a short beep. The keypad test can
be closed using the ESC key.
Cleaning program
The heating elements are "cleaned" and/or regenerated using the
cleaning program.

7.5 Stand-by

We recommend keeping the furnace head closed during stand-by to
prevent damage.

7.6 Temperature calibration

The temperature level in the sintering chamber may change after
prolonged operating hours (e.g. by contamination, wear and tear of
the heating elements etc.). For optimum function, regular
recalibration is required (see 7.2).
The calibration with temperature control ring enables the verification
of the temperature of 880 °C/1616 °F (UTH) and 1500 °C/2732 °F
(MTH) respectively, which is required for crystallization, glazing and
sintering in the sintering chamber. The calibration of both tempera-
ture ranges is not strictly required. If only sintering programs are
used, the calibration has to be done for MTH (1500 °C/2732 °F). If
only glazing and crystallization programs are used, the calibration
has to be done for UTH (880 °C/1616 °F). During the calibration
process, the rings change their dimensions due to shrinkage. The
shrinkage of the temperature control rings is decisive for the correc-
tion value of the furnace and can be found on the conversion table
(enclosed in the Temperature Checking Set). Conduct the tempera-
ture calibration only when the furnace is cold.
For calibration, you need temperature control rings, a measuring
device (slide gauge) and a conversion table (enclosed in the Tempera-
ture Checking Set).
Procedure for 880 °C (UTH):
1. Press the Settings key (78) to
access the Settings screen.
Select "Temperature Calibration"
UTH using the cursor keys
(79/80). The following display
appears:
The UTH calibration program is
selected with the ENTER key. The
following display appears:
2. Position the temperature control
ring with the UTH stamp (a) in
the centre of the sinter tray (b).
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3. Press START. The furnace head is automatically closed and the
calibration program started.
4. After the end of the program, carefully remove the temperature
control ring and allow it to cool to room temperature on the
cooling tray.
5. Place the temperature control
ring on an even surface and
determine the exact diameter
using the slide gauge.
Make sure that the temperature
control ring is flush with the
two arms of the slide gauge.
Conduct the measurement in
the area where the diameter is
the smallest.
6. Find the measured diameter in the conversion table and read off
the corresponding temperature. Only if the deviation is more than
5 °C must the furnace be readjusted.
7. If the temperature difference is higher than 5 °C the correction
value can be transferred to the furnace with the help of the
-/+ keys (77/76). Each keystroke changes the furnace temperature
by 1 °C. The correction value must be added to the current
temperature of the furnace. Once the desired correction value has
been entered, the program can be closed by pressing the ESC key
(71).
Calibration is now complete. Close the furnace head or select a
program.
Further information on calibration can be found in the
Instructions for Use of the Temperature Checking Set.
Procedure for 1500 °C (MTH):
1. Press the Settings key (78) to
access the Settings screen. Select
"Temperature Calibration" MTH
using the cursor keys. The
following display appears:
The calibration program is
selected with the ENTER key.
The following display appears:
2. Position the temperature control
ring with the MTH stamp (a) in
the centre of the sinter tray (b).
Make sure that the temperature control ring with
a)
the stamp "MTH" is used. The use of an incorrect
b)
temperature control ring may damage the sinter tray.
a)
b)