Compteur de particules

Compteur de particules

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Big Performance, Small Size

The GT-521 is a full-featured, battery-operated, portable laser particle counter that provides the functionality of a bench unit with the convenience of a handheld! It can datalog particle counts continuously or send them to a network.


Dual Programmable Particle Channels

Two programmable particle channels with a range of 0.3 – 5.0 microns each show differential or cumulative particle counts in real time, with selectable count units.


Simple and Powerful Menu - Driven Command Set

A simple touch of a button sets particle sizes, sample time, alarm settings, and basic setup parameters such as date/time and communications settings. Remote operation via RS-232 or RS-485 communications ports allows extensive control, including all front-panel operations.


Flexible Data Interfaces

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

Stores up to 4,000 records for printer output, Excel® formatted output, or networked datalogging via the included single computer software (GT-Comm).


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
  • Process Control
  • HVAC Applications
  • Filter Testing
  • Compliance Testing
  • Emission Sourcing
  • Remote Sampling
  • QA Programs Whatever your particular needs,
  • the right choice is only natural.



Counts individual particles using scattered laser light
Particle Size Range
Concentration Range
Flow Rate
Sample Time
Hold Time 
Two channels - from 0.3 to 5.0 µm (selectable in 0.1 µm increments
0 – 3,000,000 particles per cubic foot (105,900 particles/L)
± 10%, to calibration aerosol
0.3 µm
0.1 cfm (2.83 lpm)
Adjustable: 6 to 999 seconds
Adjustable: 1 to 999 seconds

Light Source

AC Adapter/Charger

Laser diode, 35 mW, 780 nm
6V Ni-MH self-contained battery pack - provides 8 hours
of typical intermittent operation, up to 5 hours continuous use
AC to DC module, 100–240 VAC to 9 VDC @ 350 mA typical
RS-232 or RS-485 Half Duplex
Meets or exceeds CE, ISO, ASTM, and JIS international certifications
16-character * 4-line LCD
7-key membrane type



Height = 6.25” (15.9 cm) Width = 4.0” (10.2 cm) Thickness = 2.1” (5.4cm)
1.94 lb - 31 oz (0.88 kg)
Operating Temperature
Storage Temperature 

0º to +50ºC

-20º to +60ºC

Supplied• Operation Manual
• Custom Serial Cable
• Communication Software (GT-Comm)
• AC to DC Converter Module with IEC AC Power Cord
• Isokinetic Sample Probe
• Screwdriver
• Carrying Case
• Zero Particulate Filter
Optional • RH & Temperature Probe (Met One Part Number G3120)
• Flow Meter (Met One Part Number 9801)
• Portable Printer (Met One Part Number G3115)
METGT521 - 0 Handheld Particle Counter