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VD (E3.1) 10/2020 page 49/179
Locked operation
Provided that the user administration has been activated by the assignment of passwords for the different
authorization types, the controller operation is first locked after turning on the unit, recognizable by the
closed lock icon in the header.
In the locked view the controller provides all display functions. No setting functions are available.
The setpoints are shaded (light grey) in normal display. Changing them by direct entry in the fixed value
operating mode is not possible. The functional icons for setpoint entry and program start in the footer are
without function.
After turning on the unit, user log-in is required to operate the controller (chap. 9.2.2)
Operation without user log-in / without password-protection
If the password function has been deactivated, after turning on the unit without user log-in there are those
controller functions available, which correspond to the highest authorization level without a password
protection. There is no lock icon in the header.
6.4 Vacuum system
With regard to operation, please observe the DGUV guidelines 213-850 on safe working in laboratories,
issued by the employers’ liability insurance association (for Germany).
Starting situation: The vacuum source is connected and ready for operation.
For the pump module with chemical membrane pump option, see chap. 4.3.2.
6.4.1 Evacuation
Preparation:
• Make sure that the “Manual ventilation” plug (7) for emergency ventilation in case of a power failure,
which is located on the chamber rear, is closed
• Pressure control must be activated.
• Turn on the vacuum pump. The pump shall continue running during the entire drying procedure.
• Set the desired pressure set-point on the controller (chap. 7).
• Monitor the internal pressure on the controller display
As long as there is a vacuum, never try to open the oven by force.
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