Heidolph Hei-VAP Precision - Manual (Page 37)

Operation Operation
72 73
Menu display
The following values can be changed in the menu view:
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.
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 pro-
cess is terminated. Setting range is between 1 mbar and the
safety pressure (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).
The entry “final pressure” can be only selected with the entry “ Multiple distillation =
yes”. If the temperature on the accurate sensor drops, the pressure in the system is
further reduced until
a) the control temperature is reached again or
b) the final pressure is reached.
The system responds similar to “stop all” in case b.)
The new settings are accepted by the “accept” entry. It is changed to the actual
value display.
All changes in the menu view are discarded with softkey “Esc“ (1).
The parameters are stored under a name to be selected by using softkey
“Store Favorite“ (1).
If the distillation will not be terminated after reaching a defined
pressure, enter value 1 as final pressure.
Valve-controlled pump is installed.
The setting range can be adjusted in the menu entry “hysteresis”
(range 1 to 50 mbar).
Speed-controlled pump is installed.
The setting range is adjustable from 10 - 100 [%] in 10% increments in
the “speed” menu entry.
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.
Softkey “Start all” and “Stop all”
A distillation can be started and stopped automatically by using softkey “Start all” (1)
and “Stop all” (1), as described in chapter “Operation” – “Softkeys”.