BT-620 Bench-Top Particle Counter

The BT-620 is a compact battery operated particle counter with six selectable size channels, built-in printer, housed in a portable stainless steel case. Flow rate is 1.0 cfm (28.3 lpm) and is maintained with volumetric flow control for improved accuracy.


The BT-620 has a large easy to read display, audio alarm, and internal printer that work together to verify particulate levels. If the particle count exceeds the users pre-set limit, the audible alarm will sound and the screen display, sample history and printout will indicate an alarm event. Two programmable count alarm limits may be set. The user can select the sizes, each of the six channels may be individually set by the operator from 0.3 to 10 microns. Custom calibrations are not required.

The BT-620 stores over 8,000 sample events. Sample history events can be viewed or printed and downloaded to a computer using Particle View software or simple ASCII terminal commands. Connectivity is built-in for both digital (Ethernet, USB, RS-232, RS-485) and analog output (0-5 VDC). The BT-620 also includes a Memory Stick port. The BT-620 The Printer has two modes of operation. Print Sample: prints sample data at the end of each sample including alarm, date, time and location. Recall Data: prints all sample data from first selected date and time to second selected date and time.

The BT-620 provides a full feature set in a lightweight convenient size, it provides 6 particle sizes, built-in printer and battery operations in a compact stainless steel case. The built-in battery provides over 8 hours of typical (intermittent) operation or 4 hours continuous operation. Connect the AC adapter/charger for longer operation and battery charging. A temperature / relative humidity plug-and-play option immediately adds ambient temperature and relative humidity capabilities to displayed and logged data.


  • Compact / Portable w/ built-in printer
  • Volumetric Flow Control – improved accuracy
  • Large Display – easily viewed from across room
  • Improved Software
  • 2-year Warranty


  • Cleanroom Monitoring/Certification
  • Medical Device Mfg.
  • Filter Testing
  • Hospitals
  • Food / Beverage
  • Aerospace Assembly
  • Cosmetic Manufacturing


Particle Size Range: 0.3μmm – 10μmm, 6 channels
Calibrated Sizes: 0.3 μmm, 0.5μmm, 1.0μmm, 2.0μmm 5.0μmm and 10μmm
User Size Settings: 0.1μmm steps from 0.3μmm – 2.0μmm
0.5μmm steps from 2.0μmm – 10μmm
Concentration Range: 0 – 6,000,000 particles per cubic foot (over 20M particles/m3)
Accuracy: ± 10% to calibration aerosol
Sensitivity: 0.3 μmm
Flow Rate: 1.0 cfm (28.3 lpm)
Sample Time Adjustable: 1 to 999 seconds
Hold Time Adjustable: 0 to 999 seconds
Light Source: Laser Diode, 90mW, 780 nm
Power: 14.8V Li-Ion self-contained battery pack
Battery operation: Up to 8 hours typical or 4 hours continuous
Full recharge approximately 3 hours
AC Adapter/Charger: Li-Ion Charger, 100 – 240 VAC @ 1.2A to 16.8 VDC @ 3.5A
Communications: USB, RS-232 or RS-485
Standards: Meets ISO 21501-4
Display: 20 character x 4 line LCD
Keyboard: 8 key membrane type
Cont. Operating Time: 4 hours
Recharge Time: 3 hours
Software: Yes
Power Supply / Charger: Yes
Size: Height = 10.1” (25.7 cm) With Handle = 11.6“(29.5 cm)
Width = 8” (20.3 cm)
Depth = 9.5” (24.1 cm)
Weight: 13.9 lb (6.3 kg)
Operating Temperature: 0 ̊ C to +40 ̊ C
Storage Temperature: -20 ̊ C to +60 ̊ C
Supplied: Operation Manual (PN BT-620-9800)
USB Cable (PN 500784)
Comet Software (PN 80248)
Particle View Software (PN PARTICLE VIEW)
Battery Charger (PN 81751)
Iso-kinetic Sample Probe (PN 81752)
Zero Particulate Filter (PN 81754)
Printer Paper – 2 Rolls (PN 750514)
Optional: RH & Temperature Probe (PN G3120)
Flow Meter (PN 81755)
Serial Cable (PN 550065)
ISO 21501-4 Calibration (PN 80849)

Specifications are subject to change at any time