6875 Freezer/Mill
Page 10 of 42 SPEX® SamplePrep LLC DEC 2015
4.2 Power Switch and Controller (Cont’d)
Figure 3 - Adjusting the Viewing Angle of the Controller
4.3 Lid, Coil Assembly, and LN Sensor
The lid of the 6875 Freezer/Mill supports the coil (dual electromagnet assembly) and coil housing.
To open the lid, hold the lid down with one hand, and with the other pull the upper end of the
latch toward you. The lower end of the latch should disengage from the cabinet. Release the lid
and it should be pushed up by the gas cylinders, which also keep the lid raised when open. The
lid must be open for insertion and removal of vials. Liquid nitrogen (LN) is added with the lid
open, unless the 6875 is equipped with the 6820 Auto-Fill System (Section 7.0).
A vial is inserted into the circular hole on the right side of the chamber housing. The gate keeps
the vial or vials in place during grinding, but must be lowered to insert or remove vials. Do not
run the 6875 Freezer/Mill without a loaded vial in the chamber.
The lid must be shut and latched for the Freezer/Mill to run. Push the lid down with one hand,
and hold it down while engaging and closing the latch.
The chamber gate (Figure 1) holds the vial or vials in the chamber during grinding. To lock a vial
in place, loosen (unscrew) the chamber gate handle a turn or two, and position it so the handle
passes through the slot in the chamber gate when the gate is raised. Tighten the chamber gate
handle against the gate, so the gate contacts the vial firmly, but do not overtighten the gate as
this can crack the plastic center section of the vial. When the chamber gate handle is properly
tightened, fold it down to lock the gate during grinding. Always use the proper Adapters for Mid-
Size and Small vials (see Section 4.4), and always wear gloves when touching a chilled vial or any
part of the chilled chamber housing!
Grasp controller from the rear
and gently pull forward to
adjust viewing angle
USB Port
(back of controller)
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