Heidolph Hei-VOLUME Distimatic Pro Notice D'instructions page 131

Operation
Preconditions
The following conditions must be met for operation in time mode:
– Heating bath heater of the rotary evaporator is switched on
– Recirculation chiller is switched on
– Vacuum pump is switched on
–
Rotary evaporator is under filling vacuum
–
Process parameters are set correctly on the rotary evaporator
–
Level sensor S4 calibrated
Before the initial filling of the evaporation flask or before the first process
step, it must be ensured in time mode that all process parameters
(vacuum, temperature, speed, cooling) are set correctly on the rotary
evaporator.
Otherwise, there may be inaccuracies in the recipe processing!
Procedure
➜
Initial filling in time mode: This step is only necessary to prevent drying or crystallization
of the educt. Activate with the
see following section „Time mode parameters" on page 132. For the initial filling, it is
essential to observe the instructions in section „Initial filling of the evaporation flask" on
page 104.
➜
In time mode, a defined quantity is filled into the evaporation flask and immediately
vaporized within a specified time:
–
The fill quantity is defined by the
evaporation time
–
The
pre-evacuation
➜
Due to the
immediately while filling. After processing a step, the evaporation flask is filled again and
the following step is processed:
–
The number of steps in a cycle is parameterized by the user. This value depends on
the desired target quantity, which is to form in layers in the evaporation flask.
➜
After processing the specified number of steps, a cycle is run through and the residue is
pressed out of the evaporation flask by means of overpressure.
–
The number of cycles is parameterized by the user.
➜
At the end of the last cycle, all connected devices are switched off (operating safe state,
end of process).
In time mode, the system containers are monitored by sensors! The end
process can be initiated and/or an ongoing process can be terminated and
the evaporator can be put into a safe operating state when a correspon-
ding signal is emitted by a sensor.
Initial filling
filling time
is defined by the user.
of the evaporation flask, the evaporation process starts
131
in the parameters screen form,
.