Miniaturized Optical Particle Counter Model 9405


The Model 9405 miniaturized Optical Particle Counter (mOPC) allows you to perform ultra-fast particle number size distribution measurements on-board Unmanned Aerial Vehicles (UAVs) and other mobile platforms where high time resolution is critical. Capable of measurements twice every second over a particle size range between 150 and 3000 nm, the system is compact, light and uses minimal power.

The mOPC offers high size resolution and only uses single-particle counting. The size range has been optimized to provide 200 nm of sizing overlap with the Model 9404 mSEMS. Development of the mOPC is built upon BRECHTEL’s years of experience with traditional OPC instruments for high size resolution hygroscopic growth measurements and aircraft field studies. Deploy the 9405 in conjunction with our other portable instruments to get a more complete picture of your aerosol sample.

Learn About Product

All Features
  • 150 to 3000 nm particle broad size range
  • High size resolution
  • Compact, lightweight, low power use
  • Rapid 1 Hz or 2 Hz number size distributions
  • Sheath flow to improve detection and background
  • Good size overlap with Model 9404 mSEMS
  • Self-contained operation with on-board data storage
  • No external pumps required
  • Minimal artifact counts due to filtered sheath flow
  • Fast measurement matches needs of mobile and airborne platforms
  • Robust design minimizes downtime
  • Easy-to-clean sample flow nozzle design and overall instrument maintenance
Technical Specs

Copyright ©2024 All specifications are subject to change without notice. BMI assumes no responsibility for inaccuracies in this document or for any obligation to update information in this document. BMI reserves the right to change, modify, transfer or otherwise revise this publication without prior notice.

*Some products may be shown with optional accessories, which are sold separately. Items shown may not be to scale.

Applications and Solutions
  • Mobile platform sampling: UAVs, Balloons, Aircraft, Vehicles
  • Personal exposure monitoring
  • Climate change field studies
  • Air quality monitoring
  • Aerosol-cloud interaction studies
  • Fog & Visibility Studies
  • Reference Instruments

Integrated firmware drives each ACCESS module from the inside – the built-in microprocessor and sensors are able to sense, control, and report on instrument performance. A serially-communicated stream of data provides real-time user access to operating parameters and measurement values. An on-board micro-SD card can be used to store data locally.

Add the Model 9400 Base Module option with the UAV Reader software to your ACCESS package to benefit from a graphical user interface (GUI) that allows you to easily interact with the instrument and view measurements on the screen of the mini-PC. Multiple ACCESS modules can be connected via a micro-USB hub to easily change the system configuration. The 9400 also allows each of the connected modules to be remotely controlled via a single RS232 connection.

The UAV Reader software automatically recognizes which instruments are attached to the Base Module and adjusts accordingly. It is provided to facilitate configuration and monitoring of the ACCESS instruments on the ground and during mobile sampling, but is not required to operate the unit.

The mOPC firmware is capable of performing the full range of pulse sizing and counting and stores data on the local SD card. Add the UAV Reader to provide real time graphs of the number size distribution and raw count distribution. If the unit is operated without the 9400 Base Module and UAV Reader software, the user can view data manually during post-processing using the Igor™ software program provided by Brechtel.

What's Included

• Model 9405 mOPC
• LED Display
• External 12 VDC power supply
• Communication and power cables
• Ship kit
• Operator’s manual
• Weatherproof shipping case


The following optional accessories are available:

Find Your Team Of Experts & Share Your Inspirations