Martin Christ Epsilon 2-10D LSCplus - Manual (Page 56)

Freeze-dryer EPSILON 2-10D LSCplus
6 Operation
56
Version 04/2013, Rev. 1.5 of 16/12/2014 • sb
Translation of the original operating manual
The following media preselection settings are possible:
• Air: Preselects the media connection "Air".
• Inert gas: Preselects the media connection "Inert Gas".
• Automatic: Automatic media connection preselection depending on the
chamber pressure and stoppering status of the product vials:
– Chamber pressure 950 mbar: Preselection of the media
connection "Air".
– Chamber pressure < 950 mbar: Preselection of the media
connection "Inert gas".
Special equipment: Gas injection with a proportional valve (4)
This function can be performed in the manual mode or saved together with
a program (see chapter 6.5.3.1 - "Creating a program").
If the freeze-dryer is equipped with a proportional gas injection valve, the
dialog box "Gas injection" can be used to preselect the vacuum control
method that is to be used.
Fig. 40: Dialog box "Gas injection"
The following methods are possible:
• Button "Off": The gas injection is deactivated. Vacuum control is
ensured solely by opening and closing the pressure control valve in the
suction line of the vacuum pump.
• Button "Standard": Vacuum control is ensured by combined evacuation
and gas injection. The gas injection solenoid valve that is installed in
series with the proportional valve is continuously open. If the actual
vacuum is better than the set value, gas will be injected by opening the
proportional valve. The opening width of the valve is automatically
controlled. If it is worse than the set value, evacuation will be performed
by opening the pressure control valve in the suction line of the vacuum
pump.
• Button "Continuous": In the range between 6 mbar and the final
vacuum, vacuum control is performed with the pressure control valve
and the gas injection solenoid valve being continuously open and solely
by varying the injection flow with the aid of the proportional valve.
Initially, the proportional valve is closed. Above 6 mbar, the vacuum is
controlled using the "Off" method.