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Model 227A/227B Handheld Airborne Particle Counters

This product is now obsolete. Please click here for the current replacement models.

Particle counting in the palm of your hand

The Model 227 Portable Airborne Particle Counter offers the features and sensitivity of larger instruments and easy handheld operation. Weighing only two pounds, the Model 227 features a sensitivity of 0.3 micron (227B) or a sensitivity of 0.5 micron (227A), is fully self-contained, and uses reliable laser diode technology. It connects to a remote printer or computer, and can be part of a facility-monitoring system.

The Model 227 counts two sizes of particles simultaneously. Sample times can be set for up to 24 hours. Count data are stored in memory for easy transfer to a printer or computer. To make the most of its portability, the Model 227 features several counting modes for quick analysis of cleanroom conditions. The concentration mode gives a continuously updated approximation of the number of particles per cubic foot or per liter. The approximation is based on a user-selectable sample period of one to ten seconds. In the auto mode, it automatically takes a specified number of samples and stops, allowing unattended operation. The average mode calculates the average, minimum, and maximum count after a specified number of samples.

In beep mode, the Model 227 sounds a beep each time it counts a specified number of particles. This is useful for locating leaks in filters.

To protect your cleanroom, the Model 227 contains an exhaust filter. The pump and sensor are turned off when the battery charge drops below a safe operating level, maintaining power to preserve data stored in memory.

The Met One Model 227: a handful of information.


  AC or battery operation
  0.3 micron at 0.1 cfm (227B)
  0.5 micron at 0.1 cfm (227A)
  Counts 2 sizes simultaneously
  Stores data from 200 locations
  Labels data with location
  Internal rechargeable battery
  Weighs only 2.1 lbs (0.97 kg)
  Spreadsheet-compatible data files with Particle Vision PortAll software


  LAF and biohazard benches
  Cleanroom laundries
  HVAC systems
  Computer rooms
  Food and beverage packaging
  Hospitals: Pharmacy and surgery
  Indoor Air Quality (IAQ)
  Aerospace Assembly
  Medical Device Assembly
  Automotive: Paint spray booths
  Filter performance

Data Sheet

Met One is now known as Beckman Coulter.

Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.

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