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Page 4 of 25 SPEX SamplePrep LLC 9.24.07
SECTION 2.0: 6870 FREEZER/MILL SPECIFICATIONS
Type of mill: cryogenic impact mill
Grinding mechanism: steel impactor driven by dual electromagnets
Coolant: liquid nitrogen
Weight (empty, without vial or coolant): approx. 44 lbs. (20 Kg)
Grinding Vials: one 6801 Large Vial, one Mid-Size Vial (6871, 6881, 6885), or one 6753
Microvial set, also one to four Small Vials (6751, 6751/52, 6761, 6771).
Typical Sample Capacity:
Small Vials: actual volume with impactor, approx. 25 ml. Typical sample weights: 2
grams for biological samples, 1 gram for polymers. Effective capacity for a given
sample is determined by trials. Overfilling a vial greatly reduces its efficiency.
6753 Microvial Set: 100 - 500 mg per individual 6753V Microvial, depending on
sample.
Mid-Size Vials have up to 5 times the sample capacity of Small Vials, and Large Vials
about twice the sample capacity of Mid-Size Vials.
Actual performance of any vial/sample combination depends on sample properties,
cooling time, grinding time, desired outcome, etc.
Typical liquid nitrogen consumption:
10-15 liters for initial cool-down and filling of the tub.
4-6 liters for each hour of operation
Actual LN consumption can vary.
Electrical specifications: CE Approved, available in 115V 60HZ or 230V 50HZ.
Cord: 115V 60HZ version, 3-prong grounded plug supplied.
230V 50HZ version, 2-prong European plug supplied.
Operator is responsible for supplying alternate line cord/plug if required.
Fuses: Two 5-amp slow-blow fuses in AC Input module.
25-amp slow-blow fuse on driver board
Dimensions
: 20½ in. (52 cm) x 21½ in. (55 cm) x 18 in. (46 cm)
CE Compliance and Certification
: The 6870 Freezer/Mill has been tested for compliance with CE
Directives for Industrial, Scientific, and Medical Equipment Emission, and Generic Light Industrial
Immunity.
Safety Features:
Lid Interlock prevents mill from running if lid is not latched shut.
Liquid nitrogen sensor shuts down mill if liquid nitrogen level is too low.
NOTE: Liquid nitrogen level should be visually checked during extended runs as well as
before every run. The Freezer/Mill warranty does not cover damage to the coil caused by
operating the mill with little or no liquid nitrogen.