Heidolph Hei-VAP, Operating Manual

Page: 32 / 96

Operation
32
Menu display
The following values can be changed in the menu view:
Heating bath Setting of the bath temperature. Setting range is between 20 °C
and maximum heating bath temperature (MAX TEMP is adjustable
in Setup) with a highest range of 210 °C.
Rotation Setting of rotation speed of the distillation flask. Setting range is
between 10 and 280 rpm.
Distillation rate
(dT)
Setting of the distillation rate. Setting range is between 1 and 10.
A high numeric value leads to a higher rate of distillation.
Max. power pump Vacuum pump (Vario Models) throughput % to maximize pump
power. Setting range is between 10 and 100 %.
Reduction of the throughput leads to higher solvent recovery
rates. (only by using rpm controlled pump Rotavac vario control or
Rotavac vario tec.)
Hysteresis The value of the hysteresis indicates how much the pressure may
rise (in mbar) before the vacuum valve is opened.
Setting range is between 1 and 50 mbar. (only by using value
controlled pump Rotavac valve control, Rotavac valve tec, or
House vacuum.)
Multiple Solvents If multiple solvents is set to „no” then the pressure is not reduced
further after the detection of the first boiling point.
If multiple solvents is set to „yes” then the pressure is reduced
until the user defined final pressure is reached.
Final pressure Setting of the absolute pressure where the distillation process is
terminated. Setting range is between 1 mbar and the safety pres-
sure (see Setup for Safety Pressure).
Timer Setting of the timer to shut down the process. Setting range is
between 1 and 1440 minutes. For continuous operation choose
„off” for Timer setting. The heating bath at the end of a timed run
can be set to turn off (Parameter found in Setup).
Selecting the entry by turning the Hei-GUIDE (6)
1. Call up the selected entry to be changed by pressing the Hei-GUIDE (6) (entry will be
highlighted in orange).
2. Set the value by using the rotary pushbutton controller Hei-GUIDE (6).
3. Pressing it again confirms the change. Softkey „Esc“ (1) terminates the change of the
currently processed entry.
Multiple Solvent distillation = no:
Must be selected, if the first vapor point must be calculated and the pressure should
not be reduced further; for example, when roughly separating 2 solvents.
The resulting pressure is accepted as target value for the vacuum. The pressure (after
reaching the vapor point) cannot be reduced further in the system when the
temperature at the Auto accurate sensor drops.
Multiple Solvent distillation = yes:
This must be selected, if the pressure should be reduced further after detecting the
first vapor point; for example, for completely distilling solvent mixtures.