Casella CEL Microdust Pro real time dust monitor - Manual (Page 29)

MicroDust Pro Aerosol Monitoring System
29 Casella CEL
When you use the instrument to measure this type of particulate again, select
the appropriate type from the list so the stored correction factor is applied
automatically to the measured values.
3.4 Making measurements
Before you make a measurement, perform the following tasks:
• Adjust the instrument’s zero and span settings (refer to “ Adjusting the
zero and span settings ” on page 23)
• Apply the appropriate correction factor (refer to “ Applying the
correction factor ” on page 28)
• Set an appropriate averaging time for the application (refer to “ Setting
the Averaging Time ” on page 19)
1. Open the probe collar fully to expose the measuring chamber.
2. Move the probe slowly through the aerosol, or rely on natural air
movement to allow the aerosol into the measuring chamber.
You can make measurements with the probe clipped to the control unit,
or you can unclip the probe to allow easy access to confined spaces.
For static monitoring applications, use an aspirator system if possible
(refer to section 6.2 “
Aspirator unit ” on page 41 for information about
the optional aspirator systems).
3. Make the required measurements for the application (refer to
“ Measurement types ” below).
Measurement types
In addition to the basic real-time measurements of particulate concentration,
the MicroDust Pro instrument can also calculate and display other useful data.
Maximum value (Max)
This represents the maximum particulate concentration that has occurred in
any 1 second period since the instrument was switched ON, since the
instrument was reset (by pressing the  key), or since logging started.
You cannot reset the maximum value while logging is active.
Average (Ave)
The average value represents the average particulate concentration since the
instrument was switched ON, since the instrument was reset (by pressing the 
key), or since logging started.