Particle Counter Sensor

Particle Counter (Profiler)

 Sensor Code AQM: AQM PP8
 Range  PM1 200 μg/m3
PM2.5 2000 μg/m3
PM10 5000 μg/m3
TSP 5000 μg/m3

Optional Particulate Counts:
0.3, 0.5, 0.7, 1.0, 2.0, 3.0, 5.0, 10 microns (counts range: 0-100,000 counts/L)

 Sensor Type  Optical Particle Counter
 Accuracy  <±(5 μg/m3 + 15% of reading)
 Flow Rate  1L per minute
 Lower Detectable Limit (2σ)  <1 μg/m3


The particle counter can be integrated into the AQM 65 or AQS 1 along with gas analyzer modules to give continuous and simultaneous measurement of dust/particulate and gas.

Designed for those who want maximum data from a single sensor, the particle profiler module provides continuous and simultaneous measurement of PM10, PM2.5, PM1, and TSP. This breadth of measurement is valuable in research and monitoring studies, and industrial applications where more than one size fraction is of interest.

The profiler comprises an optical particle counter that converts counts to a mass fraction via a proprietary algorithm stored in the system firmware. Measurements are logged and reported in real-time. The profiler is configured to display and log particle mass by default. However, there is also an option to configure the instrument to record particle counts.

The particle counter uses scattered light to measure and count particles. Light from a laser diode is collimated to illuminate the aerosol sample flow. When a particle is present it scatters the incident laser light which is detected using a 60 degree solid angle elliptical mirror at right angles to the laser beam. The amount of scattered light is converted to a voltage pulse and the amplitude of the pulse is calibrated to a particle diameter. The particles are thus assigned on the basis of size to one of eight channels. An on-board temperature sensor corrects for thermal drift, and a sheath air filter keeps the optics clean even in harsh environments.

Compared to reference instruments such as a beta attenuation monitor (BAM) this particle counter is compact, lightweight and costs 3-5 x less to own and operate. In addition data is measured, logged and reported at one minute intervals.

Typical applications include:

  • air quality research
  • industrial perimeter monitoring
  • environmental impact assessments (EIA)
  • roadside and near roadside monitoring
  • checking pollution ‘hotspots’

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