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vacuum pump. This will contaminate pump oil and can cause premature failure of
a vacuum pump.
8. Turn ON the Vacuum Pump
9. Using the touch screen display, start the tray dryer in either MANUAL or
PROGAM mode to control the shelf temperature to a set point value.
Manual Mode
Manual mode can be used to control the shelf temperature to a single set point value
between -
20⁰C and +60⁰C.
The shelves have no cooling mechanism. Therefore, any cooling below room
temperature is done by the frozen samples and the cooling from the sublimation
process that is occurring.
Primary Drying Phase
–
Allow the vacuum to pull down to the desired value. Start the
tray dryer in Manual mode. At no time during the primary drying phase should the
product temperature be allowed to rise about the sample’s eutectic temperature. If the
eutectic temperature is below -
20⁰C, do not set the heater temperature for primary
drying and do not start the tray dryer (in Manual or Program mode).
Secondary Drying
–
After all the free moisture is removed in the primary drying phase,
the temperature may be increased for the secondary drying phase.
Starting Manual Mode
Before starting the tray dryer, ensure that the collector is ON and has cooled to -
40⁰C or
below.
1. Turn the tray dryer power switch ON. The POWER/STANDBY LED indicator will
turn ON.
2. On the freeze dryer display, go to the Drying Accessory screen.
3. Press the MANUAL button.
4. Enter a Set Point value between -
20⁰C and +60⁰C. Press START.
5. The IN PROCESS LED indicator will turn ON.
