Compteur de particules

Compteur de particules

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Small Size - Big Performance

The handheld GT-321 is a portable particle counter that counts particles down to 0.3 microns—giving you portability and reliability at the lowest price in the industry.


Completely Self - Contained - Selectable Particle Sizes

Don’t let the size fool you - the GT-321 is completely self-contained with its own internal battery and sample pump, and is programmable, allowing you to choose your particle size of interest from fi ve sizes: 0.3, 0.5, 1.0, 2.0, or 5.0 microns.


Fast Sampling

Unlike other counters that can take up to a minute to deliver results, the GT-321 starts delivering volumetric concentration results in about 6 seconds! This facilitates quick multi-site sampling, tracing particle sources and site particle trending.


Simple Operation

Only two front-panel buttons control the size channels and sample cycle. The side-mounted power switch allows for convenient thumb operation.


Battery or AC Powered

The self-contained battery pack powers the unit for 8 hours of typical intermittent operation, and for up to 5 hours of continuous use. The included AC adapter operates the counter, even when the battery pack is discharged, and recharges the depleted battery overnight (16 hours) when turned off.




  • Controlled Environments
  • Indoor Air Quality
  • Process Control
  • HVAC Applications
  • Filter Testing
  • Laboratory Environments
  • Manufacturing Environments
  • Emission Sourcing




Counts individual particles using scattered laser light
Particle Size Range>0.3, >0.5, >1.0, >2.0, and >5.0 µm (selectable)
Concentration Range0–3,000,000 particles per cubic foot (105,900 particles/L)
Accuracy± 10%, to calibration aerosol
Sensitivity0.3 µm
Flow Rate0.1 cfm (2.83 lpm)
Sample Time1 minute total (fi rst reading in 9 seconds, subsequently every 6 seconds)
Light SourceLaser diode, 30 mW, 780 nm
Power6V Ni-MH self-contained battery pack—provides 8 hours of typical intermittent operation, up to 5 hours continuous use
AC Adapter/ChargerAC to DC module, 100–240 VAC to 9 VDC @ 350 mA typical
CertificationsMeets or exceeds CE, ISO, ASTM, and JIS international certifications
Display16-character LCD
Keyboard2-button membrane
SizeHeight = 6.25” (15.9 cm) Width = 3.65” (9.3 cm) Thickness = 2.0” (5.1 cm)
Weight1.74 lb - 28 oz (0.79 kg)
Operating Temperature0º to +50ºC
Storage Temperature-20º to +60ºC
  • Operation Manual
  • Custom Serial Cable
  • AC to DC Converter Module with IEC AC Power Cord
  • Isokinetic Sample Probe
  • Screwdriver
  • Carrying Case
  • Zero Particulate Filter
METGT321 - 0Handheld Particle Counter