6 Maintenance and Service
12
6 M
A I N T E N A N C E A N D
S
E R V I C E
6.1 MAINTENANCE
•
Clean the housing, control panel and control elements with a soft cloth
moistened with a mild cleanser. Do not use scouring agents, scouring pads or
solvents such as alcohol, gasoline or acetone.
•
Never contact the screen surface with sharp, rough or pointed objects such as
tweezers or ballpoint pens. These objects can scratch the screen surface.
•
Always keep the sealing ring of the lift seat free of dust to ensure a reliable
vacuum. Use a brush with a receptacle (for ceramic dust), or a moist cloth.
•
Every now and then, clean the lift rod with a dry cloth. Never oil or grease.
6.2 TEMPERATURE CALIBRATION
A number of factors influence the temperature of the firing object. These can
include: The color and shape of the firing tray, or the number and type of firing
objects. Other major influences can be age-related effects such as heating element
wear and changes to the thermoelectric properties of the temperature sensor. To
compensate for these factors and ensure normal firing results, we recommend that
you calibrate the furnace when the firing results change, or at least once a year.
Calibration is carried out by means of the calibration factor (CCF). Observe the
following instructions:
TIP F
s e e p . 4 3
•
For new furnaces, we recommend that you calibrate the temperature for the
first time after approximately six months.
•
An internal monitoring program notifies you when you should calibrate the
furnace temperature.
TIP C
s e e p . 4 2
•
Make sure that the heating element and thermocouple are not damaged.
•
Only use the DEKEMA calibration set that is for the specific furnace. This
consists of a curved silver wire and a white ceramic firing tray.
•
For calibration, always use the firing table and not the press table (only applies
to the D4
press
)
•
Make sure that the temperatures of all the firing programs are adjusted when
the CCF value changes. The firing temperatures of individual programs may
have to be corrected.
Calibrating the temperature with the calibration set:
The furnace must be thoroughly preheated before calibrating. The thermocouple
must be preconditioned. A cleaning firing must therefore precede temperature
calibration. Start the “Cleaning firing” program by selecting “Cleaning firing” in the
Setup
menu, and press Program Start (Section 7.6.2).
Shove the curved silver wire from the calibration set (as shown in Fig. 4) in the
middle of the firing tray, then place it on the firing table.
DEKEMA Dental-Keramiköfen GmbH, AUSTROMAT
®
D4, Version 3, 2006
