Rarely a flanged end plug will stick in the vial when cold. If this happens do not force the end
plug out, as you may damage the vial and/or the extractor. The vial can be allowed to warm up
gradually, or a hair-dryer or other heat source can be used to warm up the stuck end-plug rapidly.
The blunt end-plug can be difficult to remove, even from warm vials. Running hot water over
that end of the vial will make it easy.
5.09
Checking the level of liquid nitrogen
Every time you remove or insert a vial, note the level of liquid nitrogen in the tub. You should
top it off after every sample. If your programmed grinding cycle includes more than fifteen
minutes of actual grinding time, you may wish to visually check the nitrogen level at about that
point and add more if needed. We do not recommend cumulative T1 time of more than twenty
minutes, as after twenty minutes of grinding time the LN level is close to the point where the LN
sensor will shut down the mill and abort the grinding program. If in the operation of your
Freezer/Mill you find the LN sensor triggered by a shorter program, keep your programs below
that amount of grinding time.
5.10
Optional 6814 AUTO/EXTRACTOR
The 6814 Auto-Extractor, pictured on page 29, will simplify the removal of the end caps for the
various vials available for the 6850 Freezer/Mill. The 6814 AUTO/EXTRACTOR is a
motorized electrical accessory for quick and safe removal of end-plugs from chilled Freezer/Mill
vials. The 6814 AUTO/EXTRACTOR can open the large 6801 Freezer/Mill vials for the 6800
and 6850 Freezer/Mills, as well as the smaller 6751 vials that are used singly in the 6750
Freezer/Mill and four at a time in the 6800 and 6850 Freezer/Mills. Out of the box, the
AUTO/EXTRACTOR is set up for 6801 vials, but it includes an easily installed insert for
handling 6751 vials.
5.10
Optional 6814 AUTO/EXTRACTOR (Cont’d)
As with the 6804 and 6754 Extractors, the end plug of a chilled vial is placed in the bell of the
extractor, with the locating pins lined up with slots in the bell. Then a rocker switch is pressed up
to start the extractor screw, which winches out the end-plug. When the vial is opened, the end-
plug can be retrieved by pressing the rocker switch down and reversing the screw. The 6814
AUTO/EXTRACTOR takes the “wrist work” out of opening Freezer/Mill vials and is
recommended for labs with high sample throughput.
For more detailed operating instructions, please see the Operating Instructions that came with the
unit.
If you have any questions about the OPERATION, MAINTENANCE, or SERVICE of your
6750 FREEZER/MILL, please call SPEX CertiPrep at 1-800-522-7739 or 732-549-7144,
Extension 465.
6.0
MAINTENANCE
The 6750 Freezer/Mill has been designed to provide trouble-free operation over a long period of
time. To assure proper performance, perhaps the most important factor is cleanliness. When the
unit is at room temperature, any spilled powders or liquids should be wiped up immediately. The
internal tub should be wiped clean with a damp cotton cloth after every use. This should prevent
the buildup of any powders, mold/mildew, or unsightly gunk over the life of the unit.
Page 18 of 28
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