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50 Placement and calibration of sensors
Adjusting the impactor/turret setting
; NOTE: Depending on the environment (i.e., a dense, dusty manufacturing
plant), you will want to ensure the impactor is well greased and cleaned
before using. Additionally, it is recommended to monitor this process while
measuring. You may need to stop your measurements, clean and grease
the impactors, and then resume measuring. To clean and grease the
impactors, please see Chapter 7 “Cleaning and maintenance”.
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 m to over 100 m. 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 cutpoints:
x
PM2.5, PM4, PM10, or PM (all dust ranging from 0 m-100 m)
; 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.
h Adjust impactor/turret for particulate logging
1. Using the keypad navigate to the particulate or composite
measurement screen.
x 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
074-300, RevE
EVM Series