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Particulate Measurement Screen
Impactors and Particulate Measuring
EVM Series User Manual
76
Particulate Measurement Screen
The particulate measurement screen displays the user-adjustable impactor setting (i.e., PM 2.5), the
applied profile (or correction factor) and various measurements (level, max, min, etc.)
Measurement displayed
is changeable via the
lookup/glasses icon or
by pressing Enter key Impactor and profile
displayed
Particulate Level is
0.445 mg/m
3
Press
Detail soft key to view
all measurement values
Figure 5-6: Particulate Measurement screen
Impactors and Particulate Measuring
As discussed in the calibration chapter, there are four selectable particulate settings. To move the
impactor, ensure you are in stop mode. Then, twist to the right or left until you feel a tactile detent. The
impactor setting will align to the gray marking on the housing (see Figure 4-4 for an example).

NOTE: The particulate screen will display “ERR” if it is not clicked into one of the appropriate
settings. The selections include: PM2.5, PM4, PM10, and PM.

NOTE: The impactors may require cleaning during or after your measurement study. Please see
Chapter 4 , “Impactor and Use” for more information.
Extending Run-Time for PM Measurements
If you will be measuring in a dusty environment (such as an environment that is oily) or for a long period
of time (10+ hours), you may need to clean the impactors frequently in order to remove the debris build-
up on the impactor. (See
Chapter 7 for Maintenance and cleaning for more detailed instructions.)
To extend the run-time for PM measurements, attach a cyclone to the turret. The cyclone is used to
prevent the larger dust particles from building-up on the impactor which eventually clogs the impactor. It
forces the larger particulates, using centrifugal force, down and around the filter and collects in the
bottom holding cap. (See Figure 4-6 for more details.)

NOTE : You use a cyclone that is designed to work at 1.67 L/min pump flow rate.