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.


Our BT-620 Bench-Top Particle Counter provides a full feature set in a lightweight convenient size: 6 particle sizes, built-in printer, battery operation and a 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 sensor option immediately adds ambient temperature and relative humidity information to the displayed and logger data.

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

This Bench-Top Particle Counter stores over 8,000 sample events. Sample history can be viewed or printed 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 (0-5 VDC). The BT-620 also includes a Memory Stick port. The built-in printer has two modes of operation. Print Sample: prints the sampled data at the end of each sample including alarm, date, time and location. Recall Data: prints all sampled data from the first selected date and time to the second selected date and time.


  • 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: 0.3μm – 10μm, 6 channels
Calibrated Sizes: 0.3 μm, 0.5μm, 1.0μm, 2.0μm 5.0μm and 10μm
User Size Settings: 0.1μm steps from 0.3μm – 2.0μm 0.5μm steps from 2.0μm – 10μm
Concentration Range: 0 – 600,000 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