#6750, FREEZER MILLS - Wolf Laboratories

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4.3 Lid, Coil Assembly and Gate, LN Sensor (Cont’d) 6870 Freezer/Mill vials (see Section 4.4), and always wear gloves when touching a chilled vial or any part of the chilled coil housing! The LN sensor is located behind a shield on the back wall of the LN tub. If there is not enough liquid nitrogen in the tub to start the mill, when RUN is touched the RUN screen (Section 5.3) will display STATUS: LOW LN LEVEL. If the LN runs low during a grinding program the same message will appear and the program will stop. To continue running, fill the tub with liquid nitrogen to the fill mark. When RUN is pressed, the grinding program will begin where it left off. NOTE: To keep a run from being interrupted by the liquid nitrogen (LN) sensor, the LN level should be visually checked from time to time during extended runs, as well as before every run. The 6870 Freezer/Mill can run low on LN during extended runs, so should be checked after each 30 minutes of grinding time, and the LN topped off if necessary. The Freezer/Mill warranty does not cover damage to the coil caused by operating the mill with little or no liquid nitrogen. 4.4 Grinding Vial Sizes, Adapters, and Vial Openers Large vials (6801, 6871) are run one at a time in the 6870 Freezer/Mill, without any adapter. Large vials are opened using the 6804 Extractor/Vial Opener, which is part of the 6870L Accessory Package. Mid-Size vials (6881, 6883, 6885) are run one at a time, but the 6886 Mid-Size Adapter must be placed in the coil first, to center and align any Mid-Size vial. Mid-Size vials can be opened by the 6804 Extractor/Vial Opener, but only by installing the 6884 Mid-Size Vial Adapter for the 6804. The 6884 and 6886 Adapters comprise the 6870M Accessory Package. Most Small vials (6751, 6761, 6771) can be run one, two, three, or four at a time in the 6870 Freezer/Mill. However, they must be used in conjunction with the 6806 Multi-Vial Adapter, an X-shaped insert for the coil. The 6806 Adapter keeps the vials parallel to each other and the coil, so each impactor moves back and forth in line with the magnetic field. Also, if a small vial were to be positioned diagonally inside the coil, the gate could not be properly tightened against the vial, and an end plug might work its way out of the vial during grinding. When running Small vials, make sure the coil gate contacts the end plug of every vial. If the gate needs adjustment to do this, the bottom or pivot end of the gate can be moved toward or away from the coil housing by turning the gate clockwise or counterclockwise on its mounting bolt. Unlike other Small vials, the 6753 Microvial Set is run one at a time with the 6806 Adapter. Each 6753 set includes three 6753V Microvials. If more than one 6753 Microvial Set is placed in a 6870 Freezer/Mill, some of the individual Microvials will be shielded from the magnetic field, and grinding in those vials can be ineffective. Page 10 of 36 SPEX SamplePrep LLC March 2012
5.0 TOUCHSCREEN DISPLAYS 6870 Freezer/Mill The 6870 Freezer/Mill is programmed and operated through a series of touchscreen displays. Transition between screens, and all programming and operating commands, are done by touching the screen with a fingertip or stylus. Do not use a sharp point as this can damage or deface the screen. 5.1 Logo Screen When the power is switched on at the back of the mill, the LOGO screen appears during startup. This shows the SPEX SamplePrep and Freezer/Mill logos and a brief animated representation of the Freezer/Mill penguin is displayed. After the animation is complete, the display will switch to the CURRENT SETTINGS screen. 5.2 Current Settings Screen The CURRENT SETTINGS screen displays whatever program is currently set up to run. Figure 4 shows a typical program, as displayed for the 6870. Figure 4 - Current Settings Screen If a loaded vial is locked into the 6870 and the mill is run with these setting, the following sequence of events occurs: 1. Precool - the coil is inactive while the vial cools in liquid nitrogen for 10 minutes. 2. First cycle - the coil is activated and the impactor grinds for 2 minutes at a rate of 10 cycles per second (20 impacts per second). 3. Cool time - the coil is inactive for 2 minutes while it and the sample cool back down. 4. Second cycle - the coil is activated and the sample is ground for another 2 minutes. 5. Cool time - the coil is inactive for 2 minutes, as in step 3. Page 11 of 36 SPEX SamplePrep LLC March 2012
Page 1 and 2: 15 Liberty St., Metuchen, NJ 08840
Page 3 and 4: TABLE OF CONTENTS 6870 Freezer/Mill
Page 5 and 6: 2.0 6870 FREEZER/MILL SPECIFICATION
Page 7 and 8: 3.0 UNPACKING (Cont’d) Figure 2 -
Page 9: 4.2 Power Switch and Control Panel
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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