SPEX 6750 Operating Manual

Freezer/mill

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6750

FREEZER/MILL

OPERATING MANUAL

(Serial Number 05000 and Higher)

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Summary of Contents for SPEX 6750

Page 1: Operating Manual
6750 ® FREEZER/MILL OPERATING MANUAL (Serial Number 05000 and Higher)
Page 2: Table Of Contents
TABLE OF CONTENTS SECTION DESCRIPTION PAGE Description...........................3 Specifications..........................4 Unpacking ............................5 Setting Up ............................6 Operation............................14 Maintenance..........................19 Accessories ..........................20 Parts List & Item Locator......................23 Assembly Diagrams & Parts.....................24 10.0 Trouble-Shooting........................27 11.0 Warranty.............................29 Page 2 of 28...
Page 3: Description
Freezer/Mill is different in its principles and operation from any other laboratory mill. If you’re familiar with the mill and want to proceed directly to grinding, the “Running the 6750” section on p. 16 can serve as a general review of the actual operation of the mill.
Page 4: Specifications
Dimensions: 12 in. (30 cm) x 12 ½ in. (32 cm) x 9 in. (23 cm) CE Compliance and Certification: The 6750 Freezer/Mill has been tested for compliance with CE Directives for Industrial, Scientific, and Medical Equipment Emission, and Generic Light Industrial Immunity.
Page 5: Unpacking
Raise and lower the lid to insure that the coil gate (handle with roller) is moving freely and properly. Each new 6750 Freezer/Mill comes with a 6754 Extractor (page 21) and a 6755 Vial Rack. Grinding vials are necessary for processing samples but must be purchased separately. The 6751 Vial, the 6752 Steel Center Section, and the 6753 Microvial set are described on pages 20-21.
Page 6: Setting Up
The 6750 Freezer/Mill weighs about 12 pounds empty. The lid is hinged (Diagram “B,” item 16) on the left side of the cabinet and opens from the right; the lid latch is on the right. The AC Input module, and the power switch (Diagram “A,”...
Page 7 It is possible to test the 6750 Freezer/Mill without liquid nitrogen for a period of several seconds, by putting a 6751 vial in the mill and pressing the MAN key after the LN sensor has been disconnected.
Page 8 4.10 KEYPAD AND DISPLAY The keypad and display is a rectangular panel with twenty keys, three numeric LEDs, and four indicator LEDs. The keys are used to program and run the Freezer/Mill. During programming the LEDs display the control settings; when the mill is running the LEDs display the actual conditions of operation.
Page 9 4.11 KEYPAD FUNCTIONS BY KEY (Cont’d) MAN: The MANUAL key, a dual-function key which functions as a pause control when the mill is in automatic mode, or as a manual override when the mill is in stop mode. Pushing this key when the mill is stopped, or the liquid nitrogen level is too low for regular operation, activates the coil for about three seconds.
Page 10 COILS MIGHT BE DAMAGED. CONTROL MODES and CONDITIONS Through its keyboard the 6750 Freezer/Mill can be programmed in program mode, operated according to program in automatic mode, interrupted by stop mode, and tested manually in manual mode. A pause condition occurs voluntarily when the operator decides to interrupt (rather than stop) an automatic grinding cycle.
Page 11 CONTROL MODES and CONDITIONS (Cont’d) Automatic Mode: This is the operating mode of the 6750 Freezer/Mill. When the mill is programmed, the tub is filled with liquid nitrogen, and a chilled grinding vial is in place, press the RUN key. In Automatic Mode the mill will perform the following sequence: pre-cooling, grinding period 1, cooling, grinding period 2, etc., until the programmed number of...
Page 12 NOTE: Because the LN sensor will stop and abort a run if the level of liquid nitrogen level falls too low, it is important to top off the liquid nitrogen before every run, and at regular intervals during extended runs. In no case should a program include more than twenty minutes of total grinding time (for example, 10 cycles at 2 minutes each in T1).
Page 13 10. (Whenever the 6750 Freezer/Mill is switched off and then on, the program in permanent memory will include the set values for cycles, grinding time, cooling time, and pre-cooling time, but the impact frequency will always come up as 10.)
Page 14: Operation
20-amp circuit for the 115V/60 HZ version. If you have the 230V/50HZ version of the mill, make sure the cord and plug conform to local electrical codes; we furnish the 230V/50HZ 6750 Freezer/Mill with a standard European 2-prong plug with cord.
Page 15 At the same time, chill an impactor. The vial rack that comes with the 6750 Freezer/Mill can be placed in an insulated container and used to hold the vials upright during chilling. As soon as the submerged end of the vial is chilled, drop in the cold sample and the chilled impactor.
Page 16 T3: 15.0 (minutes of cooling before grinding starts) Adjust the settings as desired before operating the mill. 5.07 Running the 6750 Freezer/Mill Assuming there is liquid nitrogen in the tub and a loaded vial in the coil, and the factory control...
Page 17 Chilled vials can also be opened easily and quickly with the 6814 Auto-Extractor (page 22), an optional accessory for the 6750 and 6850 Freezer/Mills. Empty the contents of the vial into a suitable container, the quicker the better as condensation on a cold sample occurs rapidly.
Page 18: Maintenance
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.
Page 19: Accessories
To maintain the exterior of the unit, first disconnect the Freezer/Mill. Then an occasional spraying and wiping down with a mild window cleaner or similar product will be sufficient. In the rare case that you may need to service the 6750 Freezer/Mill, please call SPEX SamplePrep Customer Service for assistance.
Page 20 The standard 6751 Vial can be converted to an all- steel vial by substituting a 6752 Steel Center Section for the 6751C polycarbonate tube. 6752 Steel Center Section 7.0 Accessories: Vials, Vial Opener, Racks, and Extractors (If not included in your order, they are available for purchase at additional cost) The 6753 Microvial Set consists of the standard 6751E end- plugs, a 25048 polycarbonate tube with holes drilled in it for circulation of liquid nitrogen, and three 6753V Microvials, each...
Page 21 The 6755 Vial Rack is a Glass- reinforced acetal rack. This rack holds up to sixteen 6751 vial sets for storage and handling. One is supplied with each 6750 Freezer/Mill and with the 6800B and 6800C Accessory Packages for the 6850 Freezer/Mill.
Page 22: Parts List & Item Locator
8.0 PARTS LIST & ITEM LOCATOR (see Diagrams A, B, & C) Item Location (Diagram, Page #) Part No. Description 50587 Latch A, 24 38550 Tub, Outer A, 24 39079 Foam, Top Plate A, 24 92679 Switch, Pushbutton A, 24 38569 Driver Board A, 24...
Page 23 9.01 DIAGRAM “A” (View from rear of unit w/cover removed for clarity) Item Part No. Description 50587 Latch 38550 Tub, Outer 39079 Foam, Top Plate 92679 Switch, Pushbutton 38569 Driver Board 38579 Power Supply 96004 AC Inlet 96005 Fuse Holder 93850 Fuse, 8 Amp for 115V (2 required) 93840...
Page 24 9.02 DIAGRAM “B” (view from rear without top cover of lid) Item Part No. Description 50588 Hinge 38531 Top Cover 38562 Processor Board 38549 Control Panel Overlay 39043 Foam, Sealing Plate 24456 Tub, Inner 31522 Collar 38560 Tub Insulation 93725 Rubber Foot (4 Required) Page 24 of 28...
Page 25 9.03 DIAGRAM “C” (Magnetic Coil Assembly) Item Part No. Description 24445 Anvil 50541 Retaining Ring 32350 38853 Liquid Level Sensor 38539 Pivot Pin Yoke 38548R Coil (Solenoid) Assembly, 115V/230V Page 25 of 28...
Page 26 10.0 TROUBLE-SHOOTING GUIDE PROBLEM CAUSE SOLUTION The unit does not turn on No power Make sure power cord is plugged into outlet and inlet The unit does not turn on No power Check outlet for power and correct as required The unit does not turn on Power switch not turned Switch unit on...
Page 27: Trouble-Shooting
10.0 TROUBLE-SHOOTING GUIDE (cont’d) PROBLEM CAUSE SOLUTION Blunt end-plug doesn’t come off Hard to grip Warm vial under hot water. Use room-temperature vial wide-jaw pliers if necessary. Manual extractor jams Water on extractor Dry extractor before each use screws or bell Manual extractor jams Ice in threaded hole in Dry end plug thoroughly before using...
Page 28: Warranty
Repairs, replacements, or parts are guaranteed for 30 days or for the remaining original warranty period (whichever is greater) for the item that was repaired or replaced. Items not produced by SPEX SamplePrep LLC carry the manufacturer’s warranty only.