15
BÜCHI
Vacuum Controller
B-720
6 Maintenance
6 Maintenance
6.1 Cleaning
Clean the case with just a damp cloth (never use detergents!)
and examine simultaneously for signs of defects (controls, plugs).
6.2 Calibration
Press «STOP» for 3 seconds simultaneously with the main power
switch. On the display you will first see «C---» for 1 second,
then the pressure reading. This value can be changed with «UP»
and «DOWN». To confirm the entry, press «START».
«C---E» appears on the display to indicate the end of the
calibration before the unit returns to operating mode.
If you press «STOP» for longer than 3 seconds during the
calibration, «CC--» will appear on the display and the offset for
the pressure reading will be reset to 0.
The calibration range is ± 20 mbar.
6.3 Customer service
Only authorized customer service technicians are permitted to
intervene service the Vacuum Controller B-720. They have
undergone thorough professional training and are familiar with
the hazards that ensue from ignoring safety precautions. The
addresses of Büchi Customer Service Centers are listed on the
back cover of these operating instructions.
Please contact these centers if you have any technical questions,
problems with an application or trouble with your Vacuum
Controller.
You are welcome to contact the Büchi Customer Service Cen-
ters for: Spare parts service (please quote the order numbers
printed in the operating instructions), repair service, maintenance
service for technical consulting, please contact the Büchi agent
in your country by phone, letter, fax or telex.
Compulsory inspection and maintenance
You must follow all the instructions aimed at keeping the Vacuum
Controller in proper working order. This includes cleaning and
checking it regularly for signs of damage.