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After the grinding jars are secured in the clamps, the pin is in the closed position and the clear cover is closed it is time to select grinding settings (Figure 19). Press "PROG" to go through the list of programs already created. Program 1 (A) is currently set for 12 min at 25 1/s. This setting is good for clay rich material. Softer sediments such as CaCO3 typically need less time. It is important to only grind soft sediments in the agate jars and hard material should be ground in the shatter box. After grinding cycle has completed turn knob counter clockwise and pull pin up and into its open position (Figure 19A). Unscrew clamp and open jar to verify grind size. If sediment is still too coarse regrind.
Figure 18. A) . Preset programs. B) . The shaker frequency. C) . The time grinder is set for. D) . The start and stop.
To create a program, press "PROG" and choose a program number (you can create up to 9 different programs). When ready, press "SET", and numbers on screen start flashing. Select a frequency and a time by pressing "-" or "+". Press "SET" to save your program, flashing stops. Then press "START" to run the program just created.
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