6-14 Electrostatic Classifier Model 3082 and SMPS Spectrometer Model 3938
To clean the inner rod and the inside of the outer tube follow these
instructions:
1. Power off the classifier and unplug the power cord.
2. Disconnect the high-voltage connector from the classifier.
3. Disconnect the Polydisperse Flow tube at the top of the Long DMA.
4. Loosen the four screws on the top of the flange about 10 cm below the
top of the LDMA assembly.
W A R N I N G
To prevent sudden disconnection and potential damage, leave the
screws one turn from complete removal.
5. Carefully pull up on the assembly above the flange. You may need to
work it back and forth to loosen the O-ring seal.
6. Remove the four screws and save for reuse.
7. Lift the top of the center rod assembly until the rod is completely
removed.
W A R N I N G
Do not scratch the rod and the inside of the tube. A small scratch, nick,
or burr can disrupt the DMA electric field and adversely affect DMA
performance.
8. Visually inspect the center rod for contamination. If the rod is dirty,
clean it and the inside of the outer tube.
a. Remove the four screws that attach the outer tube to the
base plate.
b. Lift the tube off the base. Inspect the tube for dirt.
9. Wash the collector rod and the inside diameter of the outer tube with a
soft cloth soaked in isopropanol or a mild solvent.
W A R N I N G
Do not scratch the rod surface or the inner surface of the outer tube. Do
not dent the Dacron screen or the cone edge near the top of the rod. If
you damage the DMA, contact TSI.
10. Verify that the center rod is tightly screwed into the DMA head.
11. Reassemble the center rod assembly and outer tube. Do not turn the
center rod assembly counter-clockwise (with respect to the outer tube)
or you may loosen the center rod.
12. Power on the classifier and test the DMA for leaks (see Performing ISO
Zero Tests).
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