Gravimetric Cassette and Filter Paper
Impactors and When To Clean
EVM Series User Manual
Impactors and When To Clean
When the dust accumulates on top of impactor plate in a pyramid form (as displayed in the figure
below), this signifies the impactor plate requires cleaning.
For example, in a dense, dusty manufacturing plant, this may require greasing and cleaning after each
measurement or every 10 hours of measuring.
Figure 7-9: When to clean impactors
Gravimetric Cassette and Filter Paper
A filter paper in the gravimetric cassette (also referred to as “gravimetric pump protection filter”) is user-
replaceable and is included in your kit. It is suggested to replace the filter paper when the flow rate is not
maintained. The instrument will display a warning message when it needs replacing.
Replacing the filter paper in the gravimetric cassette
1. Remove the cassette by opening the back door and gently remove the cassette from the housing.
2. Open the gravimetric cassette by twisting the two pieces apart.
3. Remove the filter paper and replace it with a new paper.
4. Put the cassette back together and insert it back into the housing.
NOTE: When installing the cassette, make sure the side labeled inlet is attached to optical
engine. Also the filter paper should be on the bottom of the cassette.
Figure 7-10: Gravimetric cassette and filter paper maintenance
Gravimetric cassette
Pulls apart into two pieces
When dust accumulates in a
pyramid form on top of the
impactor, this indicates cleaning is
required.
Apply a very thin-film of silicone
grease before calibrating and
measuring (on the appropriate
impactor setting.)
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