6-24 Electrostatic Classifier Model 3082 and SMPS Spectrometer Model 3938
Performing a Leak Check
Zero test failures can be due
to a leak in either the sheath
flow path or the aerosol flow
path. A vacuum leak check
can be performed to
determine if a zero count
failure is due to a leak.
Per ISO 15900, a system
leak check procedure can be
performed as follows:
1. Power off the classifier
and disconnect it from
the CPC.
2. Install your DMA,
connecting the sheath
flow ports and
polydisperse flow port to
the classifier. See
Chapter 2: Installing a
DMA for details.
3. Install your neutralizer to
complete the internal
flow path, either
3077/3077A or 3088.
See Chapter 2: Setting
Up the Instrument for
details.
4. Install the inlet adapter. Cap the inlet with a vinyl end cap or other
plug/cap.
5. Connect the DMA monodisperse outlet to a vacuum system (not
provided) capable of pulling down to less than 10% of atmospheric
pressure (<10 kPa).
6. Seal off the classifier from the vacuum source.
7. Monitor the pressure of the vacuum system using a manometer. The
leakage rate is acceptable if the pressure inside the classifier system
changes by less than 5% per hour.
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