VAC.
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Refrigerator and vacuum pump can be started solely.
(Auto lamp on the control panel is not lighted
during this operation.) In manual operation,
Freeze Drying Ready lamp is not lighted, and
the buzzer is not sounded.
* Press Auto/Manual Select Switch to switchover
automatic/manual operation. Each time
the switch is pressed, Auto (Auto Operation Lamp
is lighted)/Manual operation (the lamp not lighted) is
switched over.
1) Press the Refrigerator switch. Refrigerator
Switch Lamp is lighted, and the refrigerator
is started (when 5 minutes passed since turning
on the Power switch.)
2) Make sure that Vacuum Cock A is closed
completely. (Marking of “VENT” is positioned
at the top.)
3) Press Vacuum Pump switch.
Vacuum Pump lamp is lighted, and the pump is
started.
4) When vacuum value reaches 20 Pa or less for
FDU-1110, and 10 Pa or less for FDU-2110,
it is possible to attach the specimen to the adaptor.
Attach the freeze-dried specimen in container
to the adapter. Turn the vacuum cock from VENT
to VAC. The container and the trap are
connected at this point.
After attaching the specimen container, degree of
vacuum rises gradually. Frost formation in white
on the surface of the container is a desirable status
during this processing.
* Do not attach all of the containers at once.
Attach containers one by one, and check
the vacuum value for respective container.
(20 Pa for FDU-1110, and 10 Pa for FDU-2110)
* If specimen is melted, pre-freeze it again.
And then, reattach it to the adapter.
* As drying process proceeds, frost formation
on the surface of the specimen container begins
to melt. Therefore, adjust the tilt of the container
in advance of the process so that the rubber
dewdrop tray can receive dripping dewdrops
appropriately.
* If granular frost formation is found inside the cold trap,
during freeze-drying process, vacuum leakage might
have been occurred. Check the joint between
the specimen container and adaptor.
5) Freeze-drying process
After attaching the specimen container, degree of
vacuum rises gradually. Frost formation in white
on the surface of the container is a desirable status
during this processing.
5. Manual Operation
Start the vacuum pump only when the inner
walls of the cold trap is cooled down.
If the pump is started before the walls are cooled
down sufficiently, the water remains in the
cold trap may flow into the vacuum pump.
It may result in equipment failure.
Attach the container to
the vacuum cock.
And turn the cock to
vacuum the container.
Connected to the trap
VENT
VAC.
VENT
VAC.
Completion of freeze-drying
Frost (Ice)
During freeze-drying
Dried specimen
Make sure to check the drainage of trap and
drain hose before starting operation.
If you start operation while being water in the
trap and drain hose, it might be causes troubles
of vacuum pump and Pirani gauge.
Keep the maximum volume of dehumidification
To minimize the water into the vacuum pump,
operate keeping the volume of dehumidification of
specifications.
The volume of dehumidification of FDU-1110 is
4L/time(about 4.5cm far from the trap wall), of FDU-
2110 3L/time(about 4.5cm far from the trap wall)
3days operation at most in continuous operation
Long time operation under ice-coating causes to
insert water to the vacuum pump. The continuous
operation should be within 3 days. In case of over 3
days, melt the ice first.
