Download Leica CM3050 S

5.
Operation
5.7
Defrosting
The Leica CM3050 S has 3 (instruments without
specimen cooling: 2) different defrosting options.
- Automatic chamber defrost cycle
- Manual chamber defrost cycle
- Specimen head defrosting (manual) - instruments with specimen cooling only.
Read the safety instructions in chapter 2.3.7 ‘Defrosting / frozen specimens’ !
Make sure to remove sensitive specimens from the cryochamber before
the defrost cycle starts!
5.7.1 Automatic chamber defrost cycle
The specimen head refrigeration is automatically switched back on when:
• at least 4 hours have passed since the defrost cycle was completed;
• and the actual chamber temperature deviates less than 5 K from set value.
After the specimen head refrigeration has been
switched back on, the specimen head temperature rises briefly to +10 °C and then decreases
until it reaches the set value.
Switching specimen cooling back on immediately after defrosting:
As soon as the chamber defrost cycle is completed, specimen cooling can be switched back
on immediately:
• Press
until menu item ‘Set specimen
temperature’ is displayed:
S E T
T EMP
O T - 3 5 ° C
d -
T EMP
O T - 3 5 ° C
dd
The automatic defrost cycle is carried out once
every 24 hours at the preselected time.
(For details see chapter 5.3.4 ‘Menu functions’ items 6 and 7).
• Press
During the defrost cycle, the corresponding asterisk is displayed inversely:
Specimen cooling is switched back on.
C T - 3 0 ° C
n n H OM E
O T - 3 5 ° C
dd
Once the defrost cycle is finished, the instrument
automatically switches back to refrigeration.
Instruments with specimen cooling:
When defrosting starts, to avoid icing the specimen head is automatically adjusted to a temperature between -10 °C and -5 °C, i.e. the set temperature value is deactivated temporarily.
44
.
S E T
Despite the possibility of switching
the specimen cooling system back
on immediately after the automatic
chamber defrost cycle, we recommend the automatic defrost cycle
be set at a point in time when the
entire procedure can be controlled
automatically.
(See also information on menu
items 6 and 7 in chapter 5.3.4 ‘Menu
functions’).
Instruction Manual V1.1 02/2000