Appendix 3: Procedure and parameter recommendations using Expert Mode
BA_Elmasolvex_VA_EN_Vers.05.2018 © Elma Schmidbauer GmbH
If dry parts are obtained in this way, then reduce the number of
cycles gradually without further reduced pressure.
This procedure is usually correct for rinsing media with high
boiling points such as elma suprol pro or others with flashpoint
>23 °C.
The first procedure shown in the example requires that the
parts, due to their still sufficiently large heat capacity as
compared with the evaporation heat of the last rinsing medium,
do not need frequent reaeration with ambient temperature air
for their heating.
Additional heating by means of frequent reaeration with ambient
temperature air is used for the second procedure. This is
needed for the drying of parts and/or baskets with low heat
capacity.
16.3.3 Rinsing medium and parameters of the
vacuum drying
The evaporation heat and the boiling point of the last rinsing
medium are essential for the drying duration; they determine its
dependency of the vapour pressure on the temperature p
V
(T).
Media are required for the (ultrasonic) cleaning and the
(ultrasound-supported) rinsing steps that still do not boil during
the necessary vacuum < 125 bar and maximum permissible
media heating to 45 °C for explosion safety (warning is output if
40 °C is exceeded).
If rinsing is not ultrasound-supported in the last rinsing medium
or heating of this rinsing medium to > 30 °C can be prevented in
another way (cooling pauses), media with boiling points under
100 °C such as IPA (isopropanol, 2-propanol) can also still be
used at normal pressure (chapter.8.1).
IPA boils at 82 °C under normal pressure of 1013 mbar, at
25 °C when reaching a vacuum of approx. 60 mbar and already
at 30 °C when reaching approx. 80 mbar (Fig. 16.7).
When using IPA as the last rinsing medium, a pressure for the
lowering of the pressure to be programmed in Dry2 can be
selected at which the rinsing medium already boils and thus the
evaporation and therefore the drying are very greatly
accelerated due to the boiling.
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