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Operation Manual Lyovapor™ L-200/L-200 Pro
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7.8.2
Pressure difference test (optional feature)
NOTE
The pressure difference test can only be carried out with a pressure difference test
kit. See Chapter 12.1.1 "Accessories", page 94
The pressure difference test establishes the difference between the readings from
two pressure sensors in the drying chamber. If the difference between the two
sensor readings is below a threshold, the freeze-drying phase can be ended.
Navigation path
➔
Method
Precondition:
R
A vacuum test has been carried out with a pressure equal to the pressure during
the subsequent freeze-drying process. See Chapter 9.2 "Performing a vacuum
test", page 83
R
The sensors for the pressure difference test have been fitted. See Chapter 7.8.1
"Connect the sensors for pressure difference test (optional feature)", page 60
R
The offset value has been determined. See Chapter 7.8.4 "Determining offset
value", page 63
u
Navigate to the
[Method]
menu via the navigation path.
u
Tap the name of the method that you wish to edit.
ð
The control panel highlights the selected method in green.
u
Tap the action
[Phase]
.
ð
The control panel shows the action Phase.
u
Tap the setting
[End point definition]
.
ð
The control panel shows the setting End point definition.
u
Tap
[Pressure difference test]
.
ð
The control panel shows the pressure difference test.
The following settings are available:
Setting
Option
Explanation
[Pressure differ-
ence test]
Yes/No
Switches the pressure difference
test on or off.
[Start time]
Enter value
Sets the time from which the
pressure difference test is to be
performed. The value relates to
the time before completion of
the primary drying phase.
