Microdust Pro
Particulate Monitor from Casella USA
The Microdust Pro from Casella USA is a portable real time monitor for assessing the concentration of suspended particulate matter and is probably the most versatile instrument available with the ability to measure from 1 ugm-3 to 2500 mgm-3. It is the only hand held real time dust monitor on the market capable of graphically presenting variations in dust concentration on a real time scrolling graph - no longer is it necessary to wait to analyze results on a PC.
Features
Wide range from 1 ugm-3 to 2500 mgm-3 in single meter
Datalogger with <15,700 readings
Detachable probe
TSP, PM10, PM2.5 or respirable measurements
Firmware calibration and zero in the field
4 user defined calibration routines available for differing dust types
Alkaline or rechargeable batteries or mains power
32 bit WindDustPro PC software as standard
Applications
Occupational health & safety monitoring
Walk through surveys
Site boundary monitoring and environmental measurement
Industrial process monitoring
Testing respiratory equipment or air filtration efficiency
Research activities
Operation & Use
The Microdust Pro measures particulate concentrations using a near forward angle light scattering technique. Infrared light of 880nm wavelength is projected through the sampling volume where contact with particulates causes the light to scatter The amount of scatter is proportional to the mass concentration and is measured by the photo detector. By using a narrow angle of scatter (12-20°) the majority of light scattered is in the diffracted and refracted components, which minimizes the uncertainty associated with particle color, shape and refractive index.
Each Microdust Pro is individually factory calibrated, using a gravimetric technique. The instrument can be returned to this factory calibration setting at any time during its life by the use of a non degradeable calibration insert (supplied with every unit). An individual gravimetric calibration is also possible. This involves the real time scrolling display of concentration levels with user selectable time bases and auto ranging y-axis scale simultaneous collection of a gravimetric (filtered) sample of the dust. In this way, two averages are collected over the exposure period. One is from the filter, whilst the other is provided by the averaging function within the instrument. It is then possible to derive the difference in these two figures and correct accordingly.
The Microdust Pro features an internal logger that can store up to 15,700 data points over 32 separate runs. The logging interval can be set from 2 seconds to 10 minutes. At 2 seconds, it is possible to record 8.76 hours of data, at 5 minutes, this equates to a total logging time of 50 days. Recorded values include:
Average concentration over the logging period (mgm-3)
Maximum concentration over the logging period (mgm-3)
Date and time stamp
Logged results are downloaded to the included MS Windows software package.
Specifications
Sensing Technique
Near forward light scattering - 880 nm infrared
Ranges
All instruments provide 0 to 2,500 mgm-3 over four ranges as standard
Resolution
0.001 mgm-3 (1ugm-3)
Operating Temperature
32 to 122°F
Storage Temperature
-4 to 131°F
Calibration
Gravimetric method using 'Arizona Fine' calibration dust (ISO12103-1, A2)
Zero Stability
+/- 0.002 mgm-3/°C
Span Stability
<0.7% FSD/°C
Battery
4 x AA/MN 1500 cells, alkaline or rechargeable NiCad
Operating Time
Alkaline: Typically > 20 hours
NiCad: Typically > 10 hours
Battery Charging
Internal NiCad fast charger circuitry, with time out protection
Charge Rate
Fast charge rate 450 mA, standby charge rate 55 mA
Power Adapter
Universal input voltage range 100-240 VAC, 47-63 Hz
AFC International, Inc.
PO Box 894, DeMotte, IN 46310
715 SW Almond St, Ste C, DeMotte, IN 46310
800-952-3293 219-987-6825 Fax 219-987-6826 eMail: sales@afcintl.com
