5-2 Model 3936 Scanning Mobility Particle Sizer
TM
(SMPS
TM
) Spectrometer
Time Period
Maintenance Refer To
8000 hours of
operation
Replace the filter cartridges in a Model 3772, 3775,
3776, 3010, 3022A, or 3025A Condensation
Particle Counter (CPC).
The CPC instruction
manual.
1 year Replace the filter cartridges in a Model 3782, 3785,
or 3786 Water-based Condensation Particle
Counter (WCPC).
The WCPC operation and
service manual.
6 months Replace the wick in a Model 3782, 3785, or 3786
WCPC.
The WCPC operation and
service manual.
Troubleshooting
This section gives solutions for possible problems as well as a leak
checking procedure for each major component of the SMPS
™
spectrometer.
Problems and Solutions
Table 5-2 gives some possible problems and solutions for
troubleshooting the SMPS
™ spectrometer. Also refer to individual
component manuals for troubleshooting information.
Table 5-2
SMPS Spectrometer Problems and Solutions
Problem Possible Solution
Cannot achieve a
particle count less
than 0.1 particle/cm
3
with no voltage on the
center rod; flows are
set correctly.
Check for leaks within the plumbing system of the SMPS
spectrometer or the isolated CPC. Instructions for performing a
leak test are given in this chapter.
Cannot get zero scan
with a filter on the
inlet using Nano DMA
If the bypass is not being used, the exhaust port must be plugged
using the cap fitting provided in the Classifier accessory kit.
Cannot get bypass flow
set on classifier
Check to make sure that the cap fitting is removed from the
exhaust port of the Classifier.
Check that the pressure drop ring in the Nano DMA is not
obstructed.
EC program cannot
communicate with
Classifier
Make sure the serial cable is connected to the Classifier serial port.
SMPS spectrometer
cannot communicate
with Classifier
The computer serial cable for the SMPS spectrometer should be
connected to the CPC not the Classifier.
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