Casella CEL Microdust Pro real time dust monitor - Manual (Page 47)

MicroDust Pro Aerosol Monitoring System
47 Casella CEL
Continuous purge technique
For long-term sampling, or where you expect to make measurements in high
concentrations of contamination, you should use a continuous source of dry
filtered air to purge the measurement chamber. Use one of the pumps from the
Casella TUFF or Apex series for this purpose. Maintain a flow rate into the
purge inlet at approximately 10 % of the main sample rate.
When you use continuous purging, you must draw the aerosol sample through
the measurement chamber by using an aspiration technique. If you do not do
this, the clean air used for purging will prevent entry of particulate matter.
If the lens becomes so heavily contaminated that this technique does not clean
it, you must return the instrument to Casella CEL for cleaning and re-
calibration. Note that the instrument warranty does NOT cover this operation
or general servicing of the instrument.
8.2 General maintenance
• Use a clean, slightly damp cloth to wipe the outside of the MicroDust
Pro instrument. Do not use abrasive, caustic or solvent materials to
clean the instrument.
• Check the condition of the battery compartment when you fit batteries
to the instrument. Check for signs of corrosion and arrange any repairs
necessary.
• Remove the batteries from the instrument if it will not be used for a long
period of time (more than one month).
• Do not allow the instrument to become wet.