CEL-712 Microdust Pro Real-time Dust Monitor
35 Casella Measurement
6. At the end of the sampling period, stop the measurement Run and the
sampling pump. Note the sampling Run end time and calculate the
volume sampled.
The average real-time measurement is available on the display and is
stored in an internal data file.
7. Write down the Microdust’s Measured Average value.
8. Condition and weigh the filter to measure the collected mass.
9. Calculate the gravimetric concentration during the sampling period as
follows:
10. Calculate the calibration correction factor as follows:
Example:
Filter mass increase = 3.21 mg
Volume sampled = 0.75 m³ (calculated from the flow rate and
sample time)
Gravimetric concentration =
mg/m³
Measured Average value = 3.45 mg/m³ (meaning the instrument in this
example gives readings that are low)
Correction factor =
Applying the correction factor
Correction factors for specific dust types may be set within the
instrument’s setup menu, accessible via the Setup icon in the
Settings screen.
The setup options include the default particulate type with a correction factor of
1.000 (which you cannot edit), and up to four user-defined particulate types.
For each user-defined particulate type you can enter a name and the associated
correction factor that you have measured and calculated for it by following the
instructions in Gravimetric calibration procedure beginning on page 34.
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