Heidolph Hei-VAP Precision Originalbetriebsanleitung Seite 25

Actual value display
✓ Prerequisite: The evaporator is in the AUTOeasy mode.
Rotation speed and heating bath can be changed as described in chapter „Operating the
control panel".
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 6.14.
AUTOaccurate mode
The vacuum in the AUTOaccurate mode is controlled by the vapor temperature sensor
AUTOaccurate.
This mode offers the following advantages:
▪ Only low quantities of solvent are suctioned by this vacuum pump.
▪
The vapor point is detected automatically and supplemented for mixtures.
▪ Multiple solvent distillation is possible without any manual adjustments.
▪ Knowledge of the thermodynamic material data is not required
The system controls the vacuum so that a temperature increase occurs on the
AUTOaccurate sensor via the produced vapor quantity. The temperature increase refers
to the starting temperature during the deactivated process. It is also necessary that a
constant temperature (Heidolph Rotacool or RotaChill recommended) is present in the
condenser prior to the start of the process. The Hei-VAP Precision automatically checks
the temperature consistency and informs the user, if necessary. The temperature differ-
ence between the condenser temperature and the temperature at the AUTOaccurate
sensor used for controlling the vacuum will be increased when increasing the distillation
rate (dT). This results in increasing the distilled solvent quantity per time.
✓ Vapor temperature sensor AUTOaccurate -(569-00040-00) is installed (see chapter
10.2). The cooling medium has run for 15 min (AUTOaccurate sensor shows a
constant temperature).
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Operation
A distillation with optimal recurring data results at low values for the
distillation rate (dT) (1-3).
Low values result in a slow distillation and high values in a quick
distillation.
➜ Select the optimal general conditions.
➜ AUTOaccurate mode can only be run in G3 and G6 glassware
confi gurations.
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