Maintenance and Service 6–3
Cleaning the Long DMA Electrodes
WARNING
High voltage is accessible in several locations within this instrument.
Make sure you unplug the power source to the Classifier and unplug the
high-voltage cable from the Classifier to the DMA before disassembling
the DMA or performing maintenance procedures.
To clean the inner rod and inside of the outer tube, follow these
steps and refer to Figure 6-2:
1. Switch the Classifier off and unplug the power cord.
2. Disconnect the high-voltage connector marked HIGH VOLTAGE
OUT FOR DMA ONLY on the side of the Classifier.
Figure 6-2
Unscrew Middle Flange to Split Long DMA for Cleaning
3. Disconnect the polydisperse flow tube at the top of the
differential mobility analyzer (DMA) assembly.
4. Disconnect the sheath-air inlet tube at the top of the DMA
assembly.
5. Loosen the four screws (see Figure 6-2) on the top of the flange
about 10 centimeters below the top of the DMA assembly,
leaving them one turn from complete removal.
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