Function of major components
Operation of the instrument will be quicker and easier if you become famil-
iar with the locations and functions of the components, systems and con-
trols described below before proceeding further.
Operating head (Figure 5, Item 1)
The operating head contains a stir/freeze wire with electrical means to
vibrate it; an ultra-stable, ultra-precise thermistor sample probe; and
devices to automatically locate the probe and sample in the freezing
chamber.
Freezing chamber (Figure 5, Item 8)
Sample cooling is performed by a thermoelectric cold stage. The cham-
ber contains a small amount of heat transfer fluid for optimum cooling
capacity.
Advanced
®
Cryoscope Model 4250 User’s Guide
12
Figure 5: Model 4250 Components and Controls
Supervisor/Operator
Keyswitch, Power Switch,
Fuse Holder, Barcode,
and RS-232 Connector on
Back Panel (see Figure 7)
Freezing
Chamber (8)
Air Filter (7)
Heat Transfer
Fluid Filter (5)
Replace Heat
Transfer Fluid
Filter Line (6)
Operating Head (1)
Stir/Freeze Wire (2)
Sample Probe (3)
Display Panel
and Keypad (4)
Printer (9)
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