Placement and Calibration of Sensors
Particulates Calibration (Zero Cal)
EVM Series User Manual
2. Twist the turret (red casing around the impactor) to the left or right until you see the appropriate
setting on the display. It will align to the impactor text and arrow on top of the housing.
NOTE: The actual diameter of the air inlet hole is directly to the left of the impactor text positioning.
PM position (no text marking)
Position used for zero calibration
Figure 4-5: Adjusting impactor/turret setting
3. If you see “< >PM ERR”, this indicates the impactor is not in the correct position and that it is
between two positions. Adjust the turret, until the correct reading is displayed on the screen.
Particulates Calibration (Zero Cal)
A zero calibration is recommended the first time you measure particulates
in the run mode. For particulate calibration, place a zero filter (also called a
HEPA filter) with attached coupler into the vent of the turret. The impactor
setting must be set at PM in order to conduct a zero cal.
NOTE: For the span on the particulate calibration, refer to the
“Gravimetric Filtering” instructions to determine the gain factor
from the correction factor.
Particulates zero cal
1. Insert the attached coupler and zero filter into the turret. Ensure the impactor is well-greased
before calibrating which requires a thin film of grease. (See “Impactor care” for details).
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