Environmental Monitoring Equipment & Supplies • Sales, Rental & Service by Enviro-Equipment — Charlotte, North Carolina USA

  • Measures total dust from 0-2500 mg/m3, auto ranging between 0-2.5, 0-25, 0-250, and 0-2500 mg/m3.
  • 0.001 mg/m3 (1ug/m3) resolution.
  • Respirable, PM2.5 and PM10 capable (accessories required).
  • Software for data download included.
  • Field calibrator and annual factory calibration certificate included.
Title Daily Rate Weekly Rate Monthly Rate
Casella MicroDust Pro Dust Monitor Rental $75.00 $225.00 $500.00

The MICRODUST pro from Casella is a portable, real time monitor for assessing the concentration of suspended particulate matter. It is probably the most versatile instrument available with the ability to measure from 1ugm-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.

The MICRODUST pro measures particulate concentrations using a near forward angle light scattering technique. Infrared light of 880nm wavelength is projected through the sensing volume where contact with particles 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 (12-20o) the majority of scattered light is in the diffracted and refracted components, which minimizes the uncertainty associated with particle color, shape and refraction index.

The MICRODUST pro has the advantage that there is only one model which covers the entire measurement range (0-2500mgm-3). It is possible to "fix" the range of the instrument, or have it as an "auto-ranging" device.

Each MICRODUST pro is individually factory calibrated, using a gravimetric technique. This instrument can be returned to its "factory" calibration setting at any time during its life by the use of a non-degradable calibration insert. An individual gravimetric calibration is also possible.

Items Included:
  • Casella Microdust Pro
  • PM10, PM2.5, ISO Respirable Adapters (must request, requires separate air sampling pump)
  • Zero Purge Bellows
  • Casella Insight Software
  • Owners Manual
  • Spare AA Batteries
  • Battery Charger (MUST REMOVE BATTERIES)
  • Optical Calibration Filter
  • Data Download Cable
  • Factory Calibration Certificate
  • Carrying Case

Sensing Technique

Near forward light scattering - 880nm infrared


0 to 2500 mgm-3 fixed or auto-ranging over four ranges as standard: 0-2.5, 0-25, 0-250, 0-2500 mgm-3


0.001 mgm-3 (1ugm-3)

Operating Temperature

0 to 50°C (non condensing)

Storage Temperature

-20°C to +55°C

Zero Stability

± 0.002mgm-3 / °C

Span Stability

< 0.7% FSD / °C


4 x AA / MN1500 cells - Alkaline or rechargeable NiCd

Operating Duration

Alkaline (2700mAh) typically > 20 hours
NiCd cells (950mAh) typically > 9 hours

Battery Charging

Internal NiCd fast charger circuitry. Charger may be disabled for dry cell operation

Power Adapter

Universal input voltage range 100-240Vac, 47-63Hz

Analogue Output

0 to 2.5 VDC FSD, 500ohms output impedance


7 key tactile membrane

Instrument Weight



  • Probe: 35mm 0 x 290mm total length
  • Instrument HxWxD:245 x 95 x 50 mm
  • Carry Case HxWxD:135 x 490 x 370 mm


128 x 64 pixel LCD graphics panel with backlight

Instantaneous reading

Rolling average concentration over a user selectable period (1 to 60 seconds)

Time Weighted Average

Average concentration since power on or reset

Maximum value

Maximum concentration since power on or reset

Scrolling Graphs

  • Real time graphs of dust concentration
  • Selectable time-base periods of 100/200 seconds, 15 minutes or 60 minutes
  • Y Axis may be auto-ranging or fixed

Battery voltage

Battery Voltage with status icon

Factory Calibration

Traceable isokinetic technique (wind tunnel) and ISO 12103-1, A2 fine test dust, dust box calibration for high concentrations

User Calibration

Four user defined calibration settings available

Routine Calibration

Software calibration for zero and span setting, Optical calibration filter supplied (restores factory calibration)

Internal Memory

64k EEPROM providing 15,700 data points

Logging Interval

Adjustable from 1 to 600 seconds

Recorded Values

Individual, average and max/min concentrations over logging period

Serial Interface

RS232 up to 38.4k baud


Windust pro provides a friendly graphical interface for instrument configuration, data download and graphical report presentation.

Operating System

Microsoft Windows 95, 98 or NT


IBM compatible Pc with RS232 serial port, 8Mb RAM, FDD, HDD, VGA color graphics