Placement and Calibration of Sensors
Adjusting the Impactor/Turret Setting
EVM Series User Manual
Adjusting the Impactor/Turret Setting
When measuring, the industrial processes (such as sanding, cutting, crushing, grinding, and
transportation) cause air pollutants. The size of the particles will enter the human body in different
areas, affecting the nasal, throat, and/or lung area.
The impactor setting is used to trap and filter out the larger size particles based on your cut-point (or
impactor setting). The range is programmed between 1 μm to over 100 μm. For example, if you are
measuring coal dust (aimed at the lung area), you would adjust your impactor setting to PM10. The
following are the user-selectable cut-points:
PM2.5, PM4, PM10, or PM (all dust ranging from 0 μm-100 μm)
NOTE: The particulate size is written on top of the turret. For PM there is no marking but is noted by
the (raised) air chamber.
Adjust impactor/turret for particulate logging
1. Using the keypad navigate to the particulate or composite measurement screen.
How to? From the Start screen, press the Right arrow key.
PM 2.5 & profile displayed
Impactor setting updates as
the turret is rotated
(when in stop mode)
Figure 4-4: PM2.5 impactor setting example
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