7-1
CHAPTER 7
Troubleshooting
This chapter tells how to troubleshoot the Classifier.
Detecting Particles When the Collector-
Rod Voltage is Not Switched on
When the collector-rod voltage is not on, the airstream flowing out
of the Monodisperse Flow connector should be particle-free. If
particles are detected in the airstream, the Classifier may have one
or more of the following problems:
Problem Solution
The ratio of aerosol to clean-
sheath air flow is too high
The imbalance ratio can occur if the
ratio of aerosol to clean-sheath-airflow
exceeds 1:10. Change flows so that ratio
is below 1:10.
The sheath-air filter has a
leak
Replace the sheath-air filter cartridge
(see “Replacing the Filter Cartridges
” in
Chapter 6).
Turbulent flow has developed
in the differential mobility
analyzer
If particles still appear after these
checks, decrease sheath and
polydisperse flows so that the total flow
rate inside the analyzer is less than 10
liters per minute. If particles disappear
using these steps, it suggests that
turbulent flow has developed in the
analyzer at normal flow rates. Contact
TSI for repair information.
Testing for Leaks
Whenever an air leak is suspected or a significant part of the
airflow system has been reassembled, perform a leak test to assure
proper performance. Begin by isolating the DMA from the Classifier
using these steps:
1. Disconnect all tubing from the DMA.
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