Bench-Top Particle Counter BT-620

The BT-620 is a compact, battery-operated particle counter with six selectable size channels, an integrated printer, and housed in a portable stainless-steel case. The device’s flow rate is 1.0 CFM (28.3 LPM) and is maintained with volumetric flow control for improved accuracy. This benchtop particle counter has a large, easy-to-read display, audible alarms, and an internal printer that work together to verify particulate levels. If the particle count exceeds the user’s 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.

Ideal for use in cleanrooms, the BT-620 was designed to easily integrate with existing building automation systems, facility software, processors, or may be used as a standalone unit.


The BT-620 particle counter is convenient for compliance with 21 CFR Part 11, designed with a password feature to prevent unauthorized changes to the user settings. The unit is also compliant with ISO 14644-1, and ISO 21501-4 with an upgraded calibration.


The BT-620 offers intuitive navigation with an ultra user-friendly interface. Each of the six channels may be individually set by the operator from 0.3 to 10 microns without requiring custom calibration. In addition to user-selectable sizes, the instrument features user-adjustable sample time, user-identifiable location IDs, and stores over 8,000 sample events.

Sample history events may be viewed or printed and downloaded to a computer using Met One’s ParticleView or Comet software, or simple ASCII terminal commands. Real-time monitoring is available with an optional software upgrade to ParticleView RT. The unit easily integrates into MODBUS multi-drop networks and facility software. 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 Printer offers 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.

A plug-and-play option can immediately add ambient temperature and relative humidity capabilities to displayed and logged data.


• Easily Integrate with Existing Facility Software
• Built-In Digital & Analog Connectivity
• 21 CFR Part 11 Compliance
• ISO21501-4 Compliant with Calibration
• Built-in Printer for Data Integrity
• Volumetric Flow Control for Improved Accuracy
• Selectable Count Units (Total count (TC), particles per liter (/L), particles per cubic foot (CF), and particles per cubic meter (M3))
• User-Friendly, Menu-Driven Setup
• User-Adjustable Sample Time
• User-Assigned Location ID
• Data Storage of Over 8000 Sample Events
• Battery & AC-Powered
• Audible Alarms



Operation Manual
USB Cable
Comet Software
ParticleView Software
Battery Charger
Iso-kinetic Sample Probe
Zero Particulate Filter
Printer Paper – 2 Rolls
NIST Certificate of Calibration


RH & Temperature Probe (P/N G3120)
Flow Meter (P/N 81755)
Serial Cable (P/N 550065)
ISO 21501-4 Calibration (P/N 80849)
Particle View RT Software (P/N Particle View RT)
Printer Paper (P/N 750514)


  • QA Programs
  • Cleanroom Monitoring

Cleanroom, Environmental Protection




PM – Particulate Matter


Automotive, Bio Energy, Bioprocessing, Chemical, Environmental & water treatment, Fermentations, Fertilizer, Food & Beverages, Forensics, Hospital, Laboratories, Marine, Petrochemical, Pharmaceutical & Bio Pharma, Polymers, Power Plants, Pulp & Paper, Refinery, Security, customs, fire department, drug agencies, Semi-Conductor, Steel Plants, Sterilization, Universities, Waste Water