#6750, FREEZER MILLS - Wolf Laboratories

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1.0 INTRODUCTION 6870 Freezer/Mill SPEX SamplePrep Freezer/Mills are cryogenic laboratory mills that cool samples to cryogenic temperatures, and pulverize them by magnetically shuttling a steel impactor back and forth against two stationary end-plugs. Since the vial is closed, the integrity of its contents is maintained: hazardous or critical samples are easily controlled, cleanup is simplified, and crosssample contamination is eliminated. Because the vial is immersed in liquid nitrogen throughout the grinding cycle, the sample is kept at cryogenic temperatures and its key aspects preserved. These features have made SPEX SamplePrep Freezer/Mills the most effective cryogenic mills in the world. They are the “mills of last resort” for many normally ungrindable samples, or samples whose composition or structure is altered by the heat generated by conventional grinding. NOTE: Please do not operate the 6870 Freezer/Mill until you have read these instructions and are familiar with its controls and operation. The Freezer/Mill is different in its principles and operation from any other laboratory mill. OPERATING CONDITIONS: Do not set up the 6870 Freezer/Mill in an insulated or confined space. The Freezer/Mill should be run on an open countertop, in ambient air. If the entire mill is chilled during operation, components such as the gas cylinders, controller, and display screen can fail. This damage is not covered by the Freezer/Mill warranty. During operation, water vapor in the air will condense on parts of the unit. For this reason, it is important not to place any moisture sensitive equipment near the Freezer/Mill. VERY IMPORTANT: Liquid nitrogen not only makes samples brittle through severe chilling, making them “grindable,” but also cools the magnetic coil which powers the 6870 Freezer/Mill. If the mill is operated without liquid nitrogen for a period of about one minute, the coil will become very hot and may sustain permanent damage. The 6870 Freezer/Mill has a liquid nitrogen sensor that should shut down the mill when the liquid nitrogen gets too low to cool the coil. Nevertheless the nitrogen level should be visually checked during extended runs as well as topped off 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. SAFETY: Liquid nitrogen can be hazardous. Its boiling point is -195.8 o C. When working with liquid nitrogen directly or indirectly, cryogenic gloves must be worn to protect hands. Be careful not to splash liquid nitrogen onto clothes or unprotected skin. Always use cryogenic gloves when handling very cold objects or materials: sample vials, the nitrogen tank valve or hose, chilled Freezer/Mill components, etc. Safety goggles are also recommended to protect eyes. Do not attempt to operate the 6870 Freezer/Mill without liquid nitrogen. Make sure that all users of the 6870 are trained in the usage and handling of liquid nitrogen. Additional information on liquid nitrogen safety can be found on websites such as http://engineering.dartmouth.edu/microengineering/ln2.html. CAUTION: Do not attempt to operate the 6870 Freezer/Mill without liquid nitrogen. Page 4 of 36 SPEX SamplePrep LLC March 2012
2.0 6870 <strong>FREEZER</strong>/MILL SPECIFICATIONS 6870 Freezer/Mill Type of Mill: Cryogenic impact mill Grinding Mechanism: Steel impactor driven by dual electromagnets Coolant: Liquid nitrogen (LN) Dimensions: 20½ in. (52 cm) x 21½ in. (55 cm) x 18 in. (46 cm) Weight: (empty, without vial or coolant) approx. 44 lbs. (20 Kg) Grinding Vials: One Large Vial (6801), one Mid-Size Vial (6871, 6881, 6885), one to four Small Vials (6751, 6751/52, 6761, 6771) or one Microvial sets (6753). Typical Vial Capacity: Small Vials: actual volume with impactor, approx. 25 ml. Typical sample weights: 2 grams for biological samples, 1 gram for polymers. 6753 Microvial Set: 100 - 500 mg per individual 6753V Microvial, depending on sample. Mid-Size Vials: up to 5 times the sample capacity of Small Vials. Large Vials: Approximately twice the sample capacity of Mid-Size Vials, or up to 10 times that of Small Vials. Actual performance of any vial/sample combination depends on sample properties, cooling time, grinding time, desired outcome, etc. Effective capacity for a given sample is determined by trial. Overfilling a vial greatly reduces its efficiency. Actual performance of any vial/sample combination depends on sample properties, cooling time, grinding time, desired outcome, etc. Typical Liquid Nitrogen 10-15 liters for initial cool-down and filling of the tub. Consumption: 4-6 liters for each hour of operation Actual LN consumption can vary. Electrical Specifications: CE Approved. Available as 115V/60HZ or 230/50HZ. Fuses: Two 15-amp slow-blow fuses in AC Input module. 25-amp slow-blow fuse on driver board. Power 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. Safety Features: Lid Interlock prevents mill from running if lid is not latched shut. Liquid nitrogen sensor shuts down mill if LN level is too low. NOTE: The sensor can shut down the mill during a run, so the 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. Page 5 of 36 SPEX SamplePrep LLC March 2012
Page 1 and 2: 15 Liberty St., Metuchen, NJ 08840
Page 3: TABLE OF CONTENTS 6870 Freezer/Mill
Page 7 and 8: 3.0 UNPACKING (Cont’d) Figure 2 -
Page 9 and 10: 4.2 Power Switch and Control Panel
Page 11 and 12: 5.0 TOUCHSCREEN DISPLAYS 6870 Freez
Page 13 and 14: 5.3 Run Screen (Cont’d) 6870 Free
Page 15 and 16: 5.4 Settings Screen 6870 Freezer/Mi
Page 17 and 18: 5.5 Store/Recall Screens 6870 Freez
Page 19 and 20: 6.0 OPERATION 6.1 Adding Liquid Nit
Page 21 and 22: 6.2 Loading Samples into Freezer/Mi
Page 23 and 24: 6.5 Opening, Emptying, and Cleaning
Page 25 and 26: 6.5 Opening, Emptying, and Cleaning
Page 27 and 28: 7.2 Liquid Nitrogen Connection (Con
Page 29 and 30: 6870 Freezer/Mill 8.0 OPTIONAL 6814
Page 31 and 32: 10.0 ACCESSORIES FOR THE 6870 (Cont
Page 33 and 34: 11.0 TROUBLE-SHOOTING GUIDE 6870 Fr
Page 35 and 36: 12.0 WARRANTY 6870 Freezer/Mill SPE

#6750, FREEZER MILLS - Wolf Laboratories

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