The BT-637 features volumetric flow that is controlled with an internal temperature sensor circuit that continually monitors and corrects the flow. The audible alarm lets the user know when variation in flow rate is greater than �5 percent.

Power and Data Storage

The AC or battery powered BT 637 laser particle counter can operate for 8 hours and requires less than 3 hrs. recharging time. Met One's BT-637 real-time particle counter can log a maximum of 8000 records.

Particle Channels

The BT-637 Bench Top Particle Counter has 6 preset channels for particles (5.0, 2.0, 1.0, 0.5, and 0.3) can be customized so that 2 of your most frequent sizes are readily displayed which eliminates constant screen scrolling. The large easily readable backlit LCD screen along with the audible programmable alarm provide you with the perfect solution for all your applications.

User Friendly Interface

The simple and user friendly interface and user's manual allow you to get up & running quickly which makes training your team no problem.

BT-637 Specifications

PRINCIPLE OF OPERATION	Scattered laser light
PERFORMANCE CHARACTERISTICS
Size Range Of Particles	6 channels of 5.0, 2.0, 1.0, 0.5, and 0.3 μm
Concentration Range	0 to 3,000,000 particles per cubic foot (105,900 particles/L)
Sample Time	1 to 999 sec. adjustable
Hold Time	0 to 999 sec. adjustable
Accuracy	+/-10%, to calibration aerosol
Sensitivity	0.3 μm
Flow Rate	(2.83 lpm) 0.1 cfm Auto Volumetric Flow Controlled
ELECTRICAL CHARACTERISTICS
Light Source	Laser diode, 35 mW, 780 nm
Power	12 Volt battery pack Li-Ion (self contained) supplies 8 hrs.continuous use, and fully recharges in about 3 hrs.
AC Charger/Adapter	AC to DC module, 100 to 240 Volts AC to 16.8 Volts DC @ 1.8 Amps
Communications	RS-485, RS-232, Analog 0 to 5 Volts & USB
INTERFACE
Keyboard	8-key membrane
Display	20-character x 4 line LCD
PHYSICAL CHARACTERISTICS
Size	Height 4.4 inches (11.3 centimeters) Width = 6.62" (16.8 centimeters) Thickness 6.65 inches (16.9 centimeters)
Weight	5 pounds 8 ounces (2.28 kilograms)
ENVIRONMENTAL
Operating Temp.	0 to +50 degrees C
Storage Temp.	-20 to +60 degrees C
ACCESSORIES
Included	Serial Cable Operation Manual USB Cable USB Driver CD Communication Software (Comet) Isokinetic Sample Probe AC - DC Converter Module w/IEC AC Power Cord Zero Particulate Filter
Optional Accessories	RH & Temperature Probe (Met One Part Number MOI #G3120) Flow Meter (Met One Part Number MOI #9801) Portable Printer (Met One Part Number MOI #G3115)