Met One GT-521S Handheld Particle Counter


Brand: Met One
Part #GT-521S

Met One GT-521S Handheld Particle Counter
The GT‐521S is a full‐featured, battery‐operated, portable particle counter that provides the functionality of a bench unit with the convenience of a handheld. This powerful device supports cumulative or differential counts, standard concentrations, total counts and count alarms.

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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 data log 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
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.


Particle Size Range Two channels—from 0.3 to 5.0 μm (selectable in 0.1 μm increments)
Concentration Range 0 – 3,000,000 particles per cubic foot (105,900 particles/L)
Accuracy ± 10%, to calibration aerosol
Sensitivity 0.3 μm
Flow Rate 0.1 cfm (2.83 lpm)
Sample Time Adjustable: 6 to 999 seconds
Hold Time Adjustable: 1 to 999 seconds
Light Source Laser diode, 30 mW, 780 nm
Power 6V Ni-MH self-contained battery pack—provides 8 hours of typical intermittent operation, up to 5 hours continuous use
AC Adapter/Charger AC to DC module, 100 – 240 VAC to 9 VDC @ 350 mA typical
Communications RS-232 or RS-485 Half Duplex
Certifications Meets or exceeds CE, ISO, ASTM, and JIS international certifications
Display 16-character × 4–line LCD
Keyboard 7-key membrane type
Size Height = 6.25″ (15.9 cm) Width = 4.0″ (10.2 cm) Thickness = 2.1″ (5.4 cm)
Weight 1.94 lb – 31 oz (0.88 kg)
Operating Temperature 0° to +50°C
Storage Temperature -20° to +60°C
Supplied Operation Manual
Custom Serial Cable
Communication Software (GT-Comm)
AC to DC Converter Module with IEC AC Power Cord
Isokinetic Sample Probe
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)

Controlled Environments Indoor Air Quality Process Control HVAC Applications Filter Testing Compliance Testing Emission Sourcing Remote Sampling QA Programs


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