5 OPERATION
5-48
EM210F-1
6.
Remove the funnel from the refrigerant tank and place the cap on the
opening.
?
Do not admit air into the column unless the trap temperature has risen to room
temperature (
F
Sect. 5.6.2).
Refrigerant tank
Refrigerant inlet por t
Cap
HTR socket
Check button
Connector box
Yellow lamp
Fig. 5.42 Refrigerant tank
5.6.2 Raising the Trap Temperature to Room Temperature
If the microscope is turned in the day and night evacuation mode before returning the
anticontamination device temperature to room temperature, a large amount of gases
absorbed on the device cooling trap will be released during column evacuation. Such gas
releases adversely affect the evacuation system.
Furthermore, if air is admitted into the column when the trap is cooled down, moisture in
the air will condense and ice will form, the latter enveloping the trap. It is, therefore,
necessary to raise the trap temperature to room temperature before admitting air into the
column and turning the microscope in the day and night evacuation mode.
1.
Place the cover provided on the viewing chamber window to protect the
window glass from splashing liquid nitrogen on it.
2.
Remove the refrigerant tank cap and put on goggles and anti-frostbite gloves.
3.
Wear goggles and anti-frostbite gloves and refrigerant into the tank.
a.
Lowering completely the protective cylinder.
b.
Place the cylinder end over the fitting port on the tank.
c.
Insert the refrigerant drainer and connect the drainer cable to the HTR
socket on the tank.
4.
Open the “Bake Out/ACD Heat” screen by selecting “Maintenance” on the
“TEM Controller” main menu.
5.
Select “ACD Heat” on the screen.
6.
Click the ACD button on the screen.
