Labconco FreeZone 794801 Series, Руководство пользователя

Страница: 33 / 52

Chapter 4: Using Your Stoppering Tray Dryer
Product Service 1-800-522-7658 29
Original instructions
vacuum pump is turned off, air will enter the system through the vacuum break
valve located between the vacuum pump and the collector chamber.
Alerts
A number of events may occur during a lyophilization procedure that will cause
an alert to be displayed on the Freeze Dryer touch screen. An audible alarm
(beeper) will also be sounded that will automatically be muted after one minute.
The specific alert type can be identified by observing the message box on the
Freeze Dryer display. The alert message box and audible alarm can be dismissed
by pressing the “Back” button on the alert message box. The following
conditions will initiate an alert:
Power Fail
If a power failure to the Stoppering Tray Dryer occurs while a run is in progress,
the “Power Fail – ST” alert will be displayed when power is restored. If the
failure is of a short duration and the Freeze Dryer collector does not warm up
above -30°C, when power is restored the Freeze Dryer and Stoppering Tray Dryer
will restart and resume operation of the refrigeration and vacuum systems. If the
power failure lasts for a longer duration and the collector warms above -30°C,
when the power is restored, the Freeze Dryer will not automatically restart. This
prevents melted sample from being drawn into the collector and prevents liquid
from being drawn into the vacuum pump.
Line Voltage Range
If the voltage supplied to the Stoppering Tray Dryer varies beyond allowable
limits, the “Line Voltage Range – ST” alert will be displayed. The high and low
alarm points are preset at the factory to correspond to the normal allowable
voltage variations based on the nominal voltage specified for the freeze dryer.
Some models may be operated outside the normal voltage limits (see
Appendix
C) . If necessary, the high and low LINE VOLTAGE OFFSETS may be adjusted
from the Settings / Maintenance screen.
System Temp Variation
Once the system temperature has stabilized (held set point temperature /-
2°C for 20 minutes), if the manual set point temperature or program hold
temperature varies more than ±2°C from the set point (as measured by the system
temperature sensor), the “System Temp Variation” alert will be displayed.
Vacuum Variation
Once the system vacuum has stabilized at a point where it changes less than 0.020
mbar in 5 minutes, if the vacuum changes more than 0.500 mbar, the “Vacuum
Variation” alert will be displayed.