6-1
CHAPTER 6
Maintenance and
Service
This chapter gives maintenance and service procedures for the
Classifier.
Periodic Maintenance
Periodic cleaning of several parts of the Classifier is necessary to
ensure proper performance. If aerosol deposits accumulate in the
differential mobility analyzer, they may cause an electrical
breakdown of the high voltage. The service intervals depend on the
aerosol concentration entering the Classifier. When the instrument
is used as an aerosol generator, the input aerosol concentration is
usually high and the Classifier requires more frequent cleaning.
The following maintenance schedule is suggested for the system
when it is used as an aerosol generator. For a Classifier used in an
SMPS system measuring room-air levels of aerosol, multiply the
hours of operation by 2-3 times.
Table 6-1
Maintenance Schedule
Maintenance Task Hours of Operation
Cleaning the impactor 5–50
Clean the collector rod and outer tube of the DMA 4000
Clean the Dacron screen of the DMA 8000
Clean the bipolar charger 8000
Replace the filter cartridges 8000
WARNING
High voltage is accessible in several locations within these instruments.
Make sure you turn off the instrument and unplug the power source
before removing the cover or performing maintenance procedures.
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