Heidolph Hei-VAP Expert Operating Instructions Manual page 113

Commissioning
By reducing the suction performance of the pump, a higher solvent recovery rate can
be achieved.
When using a speed-controlled pump, the maximum pump performance can be reduced
to a maximum of 20% in 10% steps to avoid foaming or boiling delay. When using a
diaphragm vacuum pump, this menu item is grayed out!
➜ Touch the function button to open the on-screen numeric keyboard.
➜ Set the maximum pump performance in the range between 20 % and 90 %. Entries
outside this value range are not accepted!
➜ Confirm your entry with
Calibrate pressure sensor
Menu item
The vacuum sensor is properly calibrated by the manufacturer
before delivery. Normally, recalibration is not required.
PRACTICAL TIP
During a user recalibration, the evaporation flask should rotate to
ensure that system does not have any leaks.
All other processes must be stopped!
➜ Make sure that the pressure sensor is properly connected to the device.
➜ Ventilate the system.
➜
Touch the function button to open the
and follow the instructions on the display:
➜
Use the on-screen keyboard to enter the actual atmospheric pressure.
➜
Close all openings on the evaporator system.
➜ Confirm the entry. The vacuum control starts automatically.
➜
Once the system is evacuated to a low level, the second calibration value can be
entered: Wait until the vacuum pump does not reduce the pressure further, i.e. until
the minimum possible vacuum pressure is reached.
➜
Enter this value and confirm the values.
➜
The calibration is then corrected based on the input values.
ok
to accept the the change.
Calibrate pressure sensor
115
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