Met One GT-321 Handheld Particle Counter
Met One Instruments’ handheld GT-321 is a portable particle counter that counts particles down to
0.3 microns—giving you portability and reliability at very competitive prices. Don’t let the size fool
you—the GT-321 is completely self- contained with its own internal battery and sample pump. The
321 is programmable, allowing you to choose your particle size of interest from five sizes: 0.3, 0.5,
1.0, 2.0, or 5.0 microns. 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.
Operation
The GT-321 is simple operation with only two front-panel buttons to control the size channels and
sample cycle. The side-mounted power switch allows for convenient thumb operation. The self-
contained battery pack powers the unit for 8 hours of typical intermittent operation, and up to 5
hours of continuous use. The included AC adapter/charger operates the 321, even when the battery
pack is discharged, and recharges the depleted battery overnight (16 hours) when the unit is turned
off. Units are typically available for same-day or next-day shipping!
Applications:
- Controlled Environments
- Indoor Air Quality
- Process Control
- HVAC Applications
- Filter Testing
- Laboratory Environments
- Manufacturing Environments
- Emission Sourcing
Part No
1) Met One Model GT-321 – Handheld Particle Counter
- Select Between Five Particle Sizes – 0.3, 0.5, 1.0, 2.0, or 5.0 Microns
- Simple Operation
- Fast Sampling
- Battery or AC Powered
- Keypad Selectable Sizes
- High resistance values to minimize signal line resistance
- 1-Year Warranty
Specifications
OPERATING PRINCIPLE : Counts individual particles using scattered laser light
PERFORMANCE
Particle Size Range : >0.3, >0.5, >1.0, >2.0, and >5.0 um (Selectable)
Concentration Range : 0 – 3,000,000 particles per cubic foot (105,900 particles/L)
Accuracy : ± 10%, to calibration aerosol
Sensitivity : 0.3 um
Flow Rate : 0.1 cfm (2.83 lpm)
Sample Time : 1 min total(first reading in 9 seconds, subsequently every 6 seconds)
ELECTRICAL
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
Certifications : Meets or exceeds CE, ISO, ASTM, and JIS International Certification
INTERFACE
Display : 16-character LCD
Keyboard : 2-button membrane
PHYSICAL
Size : Height 6.25" (15.9 cm) Width 3.65" (9.3 cm) Thickness 2.0" (5.1 cm)
Weight : 1.74 lb (0.79 kg)
ENVIRONMENTAL
Operating Temperature : 0° to +50°C
Storage Temperature : -20° to +60°C
ACCESSORIES : Operation Manual
Custom Serial Cable
AC to DC Converter Module with IEC AC Power Cord
Isokinetic Sample Probe
Screwdriver
Carrying Case
Zero Particulate Filter
Optional : Flow Meter (P/N: 9801)
Met One GT-321 Handheld Particle Counter datasheet
