Operating SMPS™ Hardware 4-7
1. On the Classifier, the voltage control should be set to “Panel
Ctrl” (lower left pane on display—see Figure 4-1) to allow the
DMA voltage to be controlled from the front panel, and the DMA
Voltage control (upper left pane on display) must be set to 0
volts (off).
2. Check the CPC concentration display after a few minutes.
If the display reads less than 0.1 particle/cm
3
, the SMPS
spectrometer is leak-tight and flows are laminar. The system
is now ready for sampling.
If the concentration readings do not reduce to less than
0.1 particle/cm
3
, the SMPS™ spectrometer is not set up
correctly and taking measurements at this point would not
produce useful data. In this case, check to see that all
plumbing fittings are tight. If this fails, see the “Testing for
Leaks” section in Chapter 5.
3. Install the HEPA filter (inlet filter 1036015 from accessory kit)
on the inlet and allow the system to clean out for a few minutes.
Then, scan the voltage slowly (over 2 minutes scan time) from 0
to 10,000 volts. Monitor the CPC reading as you go.
If the display reads less than 0.1 particle/cm
3
, the SMPS™
spectrometer is leak-tight. The system is now ready for
sampling.
If the concentration readings do not reduce to less than
0.1 particle/cm
3
, there may be a leak in the system
upstream of the DMA. Check that the neutralizer and
impactor (if used) are installed correctly and fittings are
tight. If this fails, see the “Testing for Leaks
” section in
Chapter 5.
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