Gradient Function - Heidolph Hei-VAP Precision Originalbetriebsanleitung

Operation
Apply data record
The data record is called up and the stored mode is activated. The actual value display is
then changed to the stored parameters on the display.
The process can be started with "Startvacuum" or "Start all".
Rename the data record
The name can be entered similar to the „save" function. The system checks for duplicates
when naming.
Copy data record
The data record is copied and saved under a new name. An entry of the new program
name will be required. A duplication of the issuance of the program name will be
checked.
Delete data record
Deletes the data record permanently.

Gradient function


A pressure ramp can be programmed with the gradient function, with which various
pressure values can be accessed. The respective pressures are controlled linearly over
time. A pressure drop, i.e. by 50 mbar within 10 minutes, therefore results in a slight
increase of the pressure/time curve than the same pressure reduction in 5 minutes. The
maximum attainable increase of the pressure/time curve is limited by the pump capacity
and the leak rate of the system.
Programming the pressure ramp (menu display)
The user can set the pressure and time in each line with gradient increments (but not the
sum time (total), since this is calculated automatically). The selected element is always
highlighted. The displayed gradient increments and the special elements on the right of
the menu entries are automatically scrolled upward and downward, since there is a total
of 20 gradient increments.
The currently selected entry (a pressure or a time) is called up by pressing the Select
Knob Hei-GUIDE and the user can set the desired value by turning the Select Knob
Hei-GUIDE. Pressing the Select Knob Hei-GUIDE again will confirm the set value.
Entering and confirming value = „---" at „Vacuum" or "Duration" will delete the respective
values. The following value pairs slide upward by one increment.
Last increment with a value of > 0 at duration results in the total processing period.
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