Placement and Calibration of Sensors
Pump Flow Rate Calibration
EVM Series User Manual
To reset, press the down arrow repeatedly to select the gravimetric fields and press the Reset
soft key. (If it is not displayed, press the Altf key.)
5. Turn the pump on by pressing the Pump
key.
6. Optional step:
a. It is optional to press the Run/Stop key to log the gravimetric filter sampling.
NOTE: If in “run mode”, a clock appears and displays the overall run time.
b. To view the particulate level, press the right arrow once from the start screen and the
particulate measurement screen will appear (noted as “PM”).
7. After the gravimetric collection, turn the pump off and reference the Gravimetric Mass field to view
the calculated particulates.
8. Lastly, calculate the ratio between the value in the Gravimetric Mass field and the weight of the
collected sample.
9. Enter in the correction factor via the Particulate Setup screen (see “Setting Profiles” section for
more details).
Pump Flow Rate Calibration
An accurate flow meter, such as a primary standard flowmeter calibrator, and inert tubing is required to
perform this calibration. The inert tubing is inserted on the dust air flow outlet (located on the back of the
housing).
NOTE: You may want to send the instrument in for a yearly calibration, if you do not own a
flowmeter calibrator for this calibration procedure.
Air Flow Outlet
Used to connect a primary standard calibrator with
tubing
Figure 4-14: Pump flow rate calibration
Flow rate calibration
1. Connect the flow meter (i.e, primary standard) and inert tubing to the EVM.
2. Turn the EVM on by pressing On/Off/Esc .
3. Select the Calibration menu by pressing the Down Arrow until it is selected and press Enter
.
4. Select Flow Rt (flow rate) by repeatedly pressing ▲/▼ Arrows key until it appears.
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