Drying Monitoring; Figure 25: Schematic Timing Of The Drying Process And Drying Monitoring - Binder VDL Series Operating Manual

11.6 Drying monitoring

Pressure


Figure 25: Schematic timing of the drying process and drying monitoring

Procedure:
• Enter the temperature set-point.
The previously entered pressure setpoint is not used with this function. It remains saved.
The drying monitoring uses a fixed minimum pressure setpoint.
• Start the drying monitoring: the vacuum pump is activated, the evacuation valve opens.
Starting from ambient pressure, the pressure starts to decrease.
• Depending on the vapor pressure of the solvent, a plateau phase is then reached
solvent vaporizes. The pressure remains almost constant.
• After the solvent is completely evaporated, drying is complete.
again
Without drying monitoring the pressure would now continue to decrease

vacuum is reached.
• The drying monitoring recognizes this second pressure drop. It turns off the pressure control. The
chamber will the be ventilated automatically
Prior to starting a new drying process, the pressure control must be activated again (chap. 11.4).
Note: If the drying monitoring is aborted during phase
pressure value as the pressure setpoint. This overwrites the previously entered pressure setpoint. It can
be changed manually at any time.
VDL (E3) 09/2019



. 


Time


The pressure starts to decrease

 ,
or the controller will take the current actual

during which the
, until the maximum final
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