Maintenance and Service 6–9
Figure 6-5
Location of Ground Wire
Caution
Make sure when you re-assemble the base of the Nano DMA that the
ground wire (Figure 6-5) is secured by the ground set screw
(Figure 6-4). Use the 0.050 inch Allen-wrench to tighten the set screw.
Failure to do this will result in improper grounding and can produce
unpredictable measurements.
Cleaning the Nano DMA Dacron Screen
The Dacron screen (P/N 1030389) located at the top of the annulus
assembly can become contaminated and contribute to arcing. An
extra Dacron screen is included in the accessory kit for cases where
the Dacron screen has been burned out from extensive
contamination, which interferes with high voltage. For this reason,
TSI recommends the Dacron screen be thoroughly cleaned. It is
only necessary to clean or replace the screen if you have an arcing
problem. Arcing may happen at high voltages near 10,000 V. If
there is an arcing problem, a particle size distribution shows
particles at the upper size limit of a scan with a HEPA filter in front
of the 3080 Classifier.
1. To remove the collector rod, follow the steps in “Cleaning the
Nano DMA Electrodes.”
2. Loosen the retaining ring with the tool provided in the Nano
DMA accessory kit and separate the inlet cone, sheath
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