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VDL (E3.1) 10/2020 Page 84/196
9.2 Overview of the drying process
Required measures for operation with solvent-containing substances, which may be able to form an explo-
sive mixture with air:
Starting situation
• The vacuum drying oven and additional equipment have been set up and installed in ac-
cordance with the instructions in this manual, the instructions of the operator and the rele-
vant regulations. Equipotential bonding according to the grounding concept is ensured
□
• The auto-ignition temperature of the solvent has been determined from its safety specifica-
tions
In the case of solvent mixtures, use the lowest auto-ignition temperature.
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• All users have been trained and are familiar with the safety plan and the required measures.
□
• The vacuum source is connected and ready for operation
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• The technical ventilation is activated.
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• The compressed air supply is connected and ready for operation. The monitoring of the
defined inlet pressure (2 bar) is active.
□
Sweeping the area for electrical equipment, the preheating chamber, and controller housing
(triangular instrument box)
• Turn the pressure regulator on the chamber rear until the clamping ring touches the lower
stop (turn clockwise).
□
• Open the sweeping plug on the chamber rear and the USB cover on the controller housing.
□
• Sweep the electrical installation room, the preheating chamber and the controller housing
with compressed air for the specified duration (chap. 9.3.2) at maximum overpressure
□
• Close the sweeping plug on the chamber rear and the USB cover on the controller housing
□
• Now the pressure regulator can be turned back (counter-clockwise rotation) until the clamp-
ing ring touches the upper stop. (only tighten to the stop by hand)
• Check on the manometer that an overpressure of at least 25 Pa (recommendation: >40 Pa)
has been reached
□
Loading and starting the drying process
• Make sure that the technical ventilation is activated
□
• Make sure that equipotential bonding has been established according to the grounding con-
cept
□
• Make sure that the sweeping times of the electrical installation room, preheating chamber,
and controller housing (triangular instrument box) have been observed
□
• Make sure that the compressed air supply for sweeping the electrical installation area, pre-
heating chamber, and controller housing is still open. Check the excess pressure of at least
25 Pa on the manometer (recommendation: >40 Pa).
□
• In case of Standby mode turn on the vacuum drying oven on the controller
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• Set the desired temperature setpoint on the controller.
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• Set the safety controller to a suitable value.
Recommended setting: safety controller mode: Limit, safety controller value approx. 5 °C
above the temperature set-point
□
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