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Home Products Dust (Indoor/Outdoor) Handheld Aerosol Monitor Met One Aerocet-531S Mass Particle Counter/Dust Monitor

Met One Aerocet-531S Mass Particle Counter/Dust Monitor

Met One Aerocet-531S Mass Particle Counter/Dust Monitor

Particle Mass Profiler and Counter in a Single Handheld Unit

The Aerocet 531S is a small, handheld, battery operated, and completely portable unit. This unit provides particle counts or mass PM measurements as stored datalogged values, real-time networked data, or printed results.

Six Mass Ranges and Four Particle Sizes

Six important mass size ranges (PM1, PM2.5, PM4, PM7, PM10, and TSP) are displayed in mass mode as well as four popular cumulative particle sizes (> 0.5, 1.0, 5.0 and10.0 microns) in count mode.

Tailored Mass Conversion

The particle counts from eight size ranges are converted to mass using a proprietary algorithm for typical-density aerosols. Accommodation for special particulate with different densities is provided through user–programmable "K-factors."

Flexible Data Interfaces

The Aerocet 531S stores up to 6,257 records. These records can be viewed on the display, or transferred to a computer via USB or RS232. Our included Comet download utility makes file transfers easy. Data files can easily be imported into an Excel® formatted output.

Temperature and Relative Humidity Option

A plug-and-play option that immediately adds ambient temperature and relative humidity capabilities to the displayed and logged data.


  • Controlled Environments
  • Indoor Air Quality
  • Hospitals & Clinics
  • Process Control
  • HVAC Applications
  • Filter Testing
  • Mining & Ore Processing
  • Emission Sourcing


OPERATING PRINCIPLE   :  Counts individual particles using scattered laser light and calculates the equivalent mass concentration using a proprietary algorithm


  • Mass Concentration Ranges  :  PM1, PM2.5, PM4, PM7, PM10, and TSP
  • Concentration Range  :  0 – 1000 ug/m3
  • Sample Time – Mass Mode  :  1 minute

Particle Mode

  • Particle Size Range  :  Four channels—0.5, 1.0, 5.0 and 10.0 μm
  • Concentration Range  :  0 – 3,000,000 particles per cubic foot (105,900 particles/L)
  • Sample Time – ParticleMode  :  1 minute
  • Accuracy   :  ± 10%, to calibration aerosol
  • Sensitivity   :  0.5 μm
  • Flow Rate   :  0.1 cfm (2.83 lpm)


  • Light Source  :  Laser diode, 90 mW, 780nm
  • Power  :  7.4V Li-ion battery pack—provides 20 hours of typical
  • intermittent operation, up to 10 hours continuous use
  • AC Adapter/Charger  :  L-ion battery charger, 100-240 VAC, 50/60Hz, 0.2A
  • Communications  :  RS-232, USB
  • Particle Certifications  :  Meets or exceeds CE and ISO21501
  • Mass Certifications  :  Requires proper use of appropriate K-factors for material
  • being measured


  • Display  :  16-character x 4-line LCD
  • Keyboard  :  7-key membrane type


  • Dimension  :  H 6.25" (15.9 cm) W4.0" (10.2 cm) Thk 2.1" (5.4 cm)
  • Weight  :  2 lb – 32 oz (0.9 kg)


  • Operating Temperature  :  0° to +50°C
  • Storage Temperature  :  -20° to +60°C

ACCESSORIES  :  Supplied Operation Manual, Custom Serial Cable, USB Cable,Communication Software (Comet), AC Adapter / Battery Charger, Isokinetic Sample Probe, Carrying Case and Zero Particulate Filter


  • RH & Temperature Probe (Met One Part Number G3120)
  • Flow Meter (Met One Part Number 9801)
  • Portable Printer (Met One Part Number G3115)
  • Part Number: