Placement and Calibration of Sensors
Impactor and use
EVM Series User Manual
The EVM supports eight different user profiles. Each profile stores a customizable profile name field,
and a correction factor. (Setting-up profiles/correction factors is discussed in the Set-up chapter,
“Setting profiles for particulates”).
The following sections will walk you through how the impactor operates, how to adjust the impactor, how
to run a zero calibration, and lastly running a gravimetric calibration.
Impactor and use
The impactor is a device used to remove larger sized particulates from the air-stream you are
measuring.
How does it operate? Air travels through the impactor and the heavy particulates will stick to the
greased plates within the impactor (1). The Pump will circulate the air as it passes through the tubing in
the back of the instrument (2). The smaller, lighter particulates will pass through the optical engine (3)
and collects in the gravimetric filter/cassettes (4).
2. Pump – circulates the air
through the tubing
1. Filters through
impactor
3. Passes through
optical engine
4. Collects in Grav.
filter/cassettes
Figure 4-3: How the impactor functions
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, see Chapter 7 “Cleaning and maintenance”.
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