Operation
37
Start pressure ramp
The pressure ramp is started with softkey „start all“ (1) or „start vacuum“ (1).
The pressure/time segments are processed.
Note: The maximum attainable increase of the pressure/time curve is limited by the
pump capacity and the leak rate of the system.
The process is terminated when reaching the last entry. The vacuum control is switched
off, the system is ventilated. The lift is raised with a motorized lift. The heating bath is
switched off depending on the setting in the setup.
Calling up the pressure ramp
Pressure ramps can be called up via the Favorites menu.
The programmed pressure ramps can be edited when the process is de-activated by
changing the respective parameters (see chapter 6.12.1).
Softkeys
Softkey „Graph”
The pressure curve is displayed in the graphic view of the actual value display. The time
is illustrated in [min] on the x axis and the associated pressure in [mbar] on the y axis.
Switching over between „graph” and „values” is not possible when the
vacuum control unit is switched off.
Only the section for which pressure values are available is shown on the pressure axis.
The displayed time range on the x axis is set in the setup. If the set time range is
exceeded, the time window will be continuously shifted.
Softkey „Start all” and „Stop all”
A distillation can be started and stopped automatically by using softkey „Start all” (1) and
„Stop all” (1).
➜
The unit is operational.
➜
The immersion depth of the evaporator fl ask is set (see chapter 4.5.7).
➜
The desired settings are completed.
Caution - Glass breakage! The immersion depth of the evaporator
fl asks must be set correctly to prevent lowering of fl ask into bot-tom of
heat bath on motor lift models.
”Start all”
Caution - Glass breakage! The immersion depth of the evaporator fl asks must be set
correctly to prevent lowering of fl ask into bot-tom of heat bath on motor lift models.
All parameters of the distillation can be changed during the course of
the „start all” function.
”Stop all”
The lift moves upward (only for the motor lift unit), rotation, vacuum control and timing
are stopped.
Summary of Contents for Hei-VAP
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