Aerosol Mass Monitor Model 831

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Small - Reliable – Affordable

Four Mass Ranges (PM1, PM2.5, PM4, PM10)

A mass monitor that simultaneously provides data of four important mass ranges in one minute.

Handheld Operation

Survey the environment with this extremely portable, size selective mass monitor. This small lightweight instrument is only 28 ounces and is the perfect survey tool for a wide range of applications.

Simple Operation

Only two front-panel buttons accompany the multifunction rotary scroll wheel to provide simple and efficient operation. Just press and rotate to scroll thru the menu driven platform.

Sample History

View sample history easily on the display or export data via the USB port using the included software. Unit stores up to 2500 sample events. USB interface provides quick data download and field firmware upgrades.

Battery Powered

24 hours of typical intermittent operation and up to 8 hours of continuous use. Recharge time is only 2.5 hours. The included AC charger / adapter operates the counter even when the batter pack is discharged.


  • Industrial/Occupational Hygiene
  • Point Source Location Monitoring
  • Indoor/Outdoor Air Quality
  • Process Control
  • HVAC Applications
  • Filter Testing
  • Mining and Ore Processing
  • Remote Sampling

Specifications 831

Operating Principle             Particle count to mass conversion


Sample Duration                  1 minute

Data storage                        2,500 records

Display                                 2-line by 16-character LCD

Controls                               2 button keypad with rotary dial


PM Ranges                          PM1, PM2.5, PM4 and PM10

Concentration Range          0 – 1,000 µg/m3

Resolution                           0.1µg/m3 (display / serial output)

Sensitivity                            0.5µm

Accuracy                             ± 10% to calibration aerosol

Flow rate                             0.1 CFM (2.83 lpm)


Light Source                        Laser Diode, 780 nm, 40 mW typical

AC Adapter/Charger           AC to DC module, 100 – 240 VAC to 8.4 VDC

Battery Type                        Li-ion rechargeable Battery 

Battery Operating Time       8 hours continuous operation 

      24 hour intermittent operation 

Battery Recharge Time      2.5 hours typical 

Communication                  USB Mini B Type


Size Height:                         6.25” (15.9 cm) Width: 3.63” (9.22 cm)

Thickness:                           2.00” (5.08 cm)

Weight                                 1.74 lbs – 28 ounces – (0.79 kg)


Operating Temperature       0º C to +50º C 

Storage Temperature          -20º C to +60º C


Supplied                                Battery charger / adapter

                                               USB Cable

                                               Operation manual

                                               Comet software

Optional                                 Carrying Case (P/N 8517)

                                               Protective Boot (P/N 80450)

                                               Zero Filter Kit (P/N 80846)

                                               Flow Meter Kit (P/N 80530)

PDF Manual: Aerosol Mass Monitor Model 831 Manual

Aerosol Mass Monitor Model 831
Item # MOI831 

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