PARTICLE COUNTER HANDHELD, TYPE GT 521, MERK ONE-USA

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
	: 0.1 cfm (2.83 lpm)
Sample Time	: Adjustable: 6 to 999 seconds
Hold Time	: Adjustable: 1 to 999 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 or RS-485 Half Duplex
Interface
Display	: 16-character × 4–line LCD
Keyboard	: 7-key membrane type
Physical
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)
Environmental
Operating Temperature	: 0° to +50°C
Storage Temperature	: -20° to +60°C