4.0
SETTING UP
4.01
Electrical Hookup
Plug the electrical cord into the inlet on the back of the Freezer/Mill lid, and then into a standard
3-prong grounded electrical outlet. We recommend a fused 20-amp circuit for the 115V/60 HZ
version. If you have the 230V/50HZ version of the mill, make sure the cord and plug conform to
local electrical codes; we furnish the 230V/50HZ 6750 Freezer/Mill with a standard European 2-
prong plug with cord.
The 6750 Freezer/Mill weighs about 12 pounds empty. The lid is hinged (Diagram “B,” item 16)
on the left side of the cabinet and opens from the right; the lid latch is on the right. The AC
Input module, and the power switch (Diagram “A,” item 7) are on the back of the cabinet. The
fuse is in a tray that can be opened with a fingernail or a small knife-blade. Also on the back of
the cabinet are the vent from the liquid nitrogen tub, and a pneumatic cylinder (Diagram “A,”
item 13) to control the movement of the lid. The control panel (Diagram “B,” item 19) is on top
of the lid.
4.02
Power Switch and Control Panel
The power switch is the rocker switch on the rear of the Lid. It is marked with two numerical
symbols, zero (0) for “off” and one (I) for “on.” Press the one (I) side of the switch to turn the
power on, or press the zero (0) side of the switch to turn the power off. When power to the mill
is on, the control panel display will be lit.
The control panel includes (from left to right) LED displays, and a keypad. The Freezer/Mill is
programmed and operated through its control panel, which is described and illustrated in detail
on page 9. Programmable parameters include pre-cooling time, grinding time, cooling time
between grinding periods, the number of grinding periods, and the frequency of grinding
impacts. The control display also warns if the lid is not fully closed, or if there is not enough
liquid nitrogen in the tub.
4.03
Lid and Coil Assembly
The lid of the Freezer/Mill supports the dual electromagnet assembly, or coil, and coil housing
(Diagram “C”). The open space in the coil housing, above the coil, will hold one or two loaded
vials, and pre-cool them while another is in the coil, for grinding. Inside the lid are the main
electronic board and power supply. To open the lid, push the upper end of the latch (Diagram
“B,” item 3) away from the lid, then down. If the lower end of the latch is still hooked to the
body of the mill, push the lid down and pull the bottom of the latch away from the body of the
mill. Then raise the lid, whose movement is damped by a pneumatic cylinder.
The lid must be open in order to load a sample vial into the coil or pre-cooler, to remove a
sample vial, or to fill the tank with liquid nitrogen. When the lid is not closed and latched,
“LID” will appear in the LED display and blink, the “fault” indicator will blink, and the controls
will not function.
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