Met One BT-645 Portable Dust Monitor
Met One Instruments’ BT‐645 Portable Dust Monitor has been designed to continuously measure
and record particulate information for indoor work place and public space environments. Our BT-
645 optical sensor, matched electronics and backlit display, are enclosed in a rugged metal enclosure
to protect the instrument during normal daily use.
Operation
The BT-645 laser optical sensor is used to detect and measure particulate concentrations up to 100
milligrams per cubic meter. The continuous flow optical sensor is combined with purge air to ensure
accurate measurements in adverse environments. The internal datalogger will store over 11,000
samples. Sample history events can be viewed on the display or downloaded to a computer using
Comet software. The BT-645 internal battery pack provides over 10 hours of continuous operation.
Battery recharge time is approximately 2.5 hours. The standard unit is supplied with a TSP inlet.
Optional sampling inlets are available for PM1, PM2.5, and PM10
Applications:
- Public and Workplace Monitoring
- Industrial / Occupational Hygiene
- Indoor Air Quality
Part No
1) Met One Model GT-645 – Portable Dust Monitor
- Four Mass Ranges (PM1, PM2.5, PM10 & TSP)
- Rugged design
- Real Time Monitoring
- Sample History
- Low Cost w/Data Logging
- Purge air system
- 1-Year Warranty
Measurements & Specifications
OPERATING PRINCIPLE : Forward light scatter laser nephelometer
PERFORMANCE
Concentration Range : 0 to 100 mg/m3 (0 to 100,000 µg/m3 )
Sensitivity : 1 µg/m3
Accuracy : 5% traceable to standard with 0.6 µm PSL
Measure Time : 1, 5, 10, 15, 30 and 60 minutes
Flow Rate : 2 LPM
Note: Measurement accuracy requires use of appropriate
K‐factor for the material being measured.
ELECTRICAL
Light Source : Laser diode, 5 mW, 670 nm
Power : 14.8V Li‐ion (Lithium Ion) battery pack
Battery Life : Over 10 hours continuous operation
AC Adapter / Charger : Li-ion battery charger, 100-240 VAC, 50/60Hz to 16.8V @ 1.8A
Communications : RS‐232, USB
Data Storage : Over 5,000 samples
INTERFACE
Display : 4 X 20 LCD
Keyboard : 6‐key membrane type
PHYSICAL
Size : Height = 4.25” (10.8 cm)
Width = 7.44” (18.9 cm)
Thickness = 3.25” (5.4 cm)
Weight : 3.7 lbs (1.7 kg)
ENVIRONMENTAL
Operating Temperature : 0˚ to +50˚C
Relative Humidity : 90% (non‐condensing)
Storage Temperature : -20˚ to +60˚C
ACCESSORIES
Supplied : User Manual
USB Cable
Communications Software (Comet)
AC Adapter / Battery Charger
Optional : PM2.5 Sharp Cut Cyclone (SCC‐112)
PM10 Sharp Cut Cyclone (SCC‐110)
Custom Serial Cable (PN 3228)
Met One AEROCET 831 Aerosol Mass Monitor datasheet
