3.3 Operational Feedback
At the end of a manual measurement cycle the instrument will produce a short beep to
signal the operator that the cycle has been completed.
During the measurement cycle the top or time line of the display is replaced with a
progress bar graph and a countdown timer that shows the sample time left in seconds.
3.4 Applications as a particle counter
• Clean room monitoring, verification, and hepa filter testing, FED. STD 209
• Indoor and outdoor (*) air quality studies
• Finding leaks and sources of contamination air ducts and filtration systems
• Hospitals and nursing homes
• Test the efficiency of residential air purifiers and vacuum cleaners
• Check filters for particle leaks
• Epidemiological studies
• Reentrainment studies
3.5 Applications as a particulate mass monitor (**)
• Process control monitoring in sawmills, grain elevators, quarries etc.
• Mines and ore processing plants
• Indoor and outdoor (*) air quality studies
• Finding leaks and sources of contamination air ducts and filtration systems
• Concerned citizen groups that want to do their own air quality studies
• Event monitoring, fence line monitoring
• Epidemiological studies
(*) only with proper protection (e.g. watertight enclosure) and proper precautions (e.g.
no moisture can enter the sample inlet).
(**) if high accuracy is required or atypical aerosols (e.g. Sahara dust) is being sampled
Met One Instruments recommends a K-factor calibration at the sampling location prior
to conducting the measurements.
3.6 Iso-kinetic Sampling
The AEROCET 531 comes with an iso-kinetic probe that attaches to its inlet nozzle with
the short piece of Tygon tubing provided.
The iso-kinetic probe helps reduce count errors related to the sample flow velocity and
the aerodynamics of small particles.