EcoChem Analytics

Model PAS 2200CE - Photoelectric Aerosol Sensor (PAS)

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The PAS 2000 works on the following principles: Using an Excimer lamp the aerosol flow is exposed to UV radiation. The Excimer lamp offers a high intensity, narrowband source of UV radiation. The wavelength of the light is chosen such that only the carbon aerosols are ionized, while gas molecules and non-carbon aerosols remain neutral. The carbon aerosol particles emit electrons, which are subsequently removed when an electric field is applied.  The remaining positively charged particles are collected on a filter inside an electrometer, where the charge is measured. The resulting electric current establishes a signal, which is proportional to the concentration of Elemental Carbon and/ or PAH. Also by operating the Excimer lamp in a chopped mode, the PAS 2000 can eliminate the background signal, which is associated with freshly generated aerosols. The chopped mode also enables a dynamic zero to be generated automatically by the instrument.

  • Detects ultrafine carbon aerosols in real-time
  • Lightweight, compact and ruggedized construction
  • Battery powered with onboard data storage
  • Applications related to personal exposure in various environments (homes, workplace, automobiles, tunnels etc.)
  • Companion product to the DC 2200CE --- the DC 2200CE measures ALL particulate matter, the PAS 2200CE measures PAH (primarily on carbonaeous matter)

Source-specific calibration curves are available or can be generated where the monitor output is compared to an analytically determined EC and PAH concentration. A site-specific calibration curve can provide greater accuracy for the particle size, charge and compound-specific to the source. In addition to the site-specific curves, an approximate universal calibration curve can be used for screening and real-time trending applications.

  • Display: 16 characters with 2 lines LED
  • Power: 115 volts AC / 60 Hz & 220 volts AC / 50 HzMax.
  • Battery: 15 volts Lithium Metal Hydride
  • Range : 0 to 4000 ng/m3 (conversion to particle-surface area is site-specific)
  • Sensitivity: ~ 10 ng/m3 (actual calibration is site-specific)
  • Lower Threshold: ~ 10 ng/m3
  • Response time: < 10 seconds (adjustable)
  • Digital Output: RS - 232 (for data download and program upload)
  • Analog Output: 0 to 10 volts
  • Sample gas: Built-in pump with flowrate controlled at 1 L/min
  • Operating temp: 40 to 104 ºF (5 to 40ºC)
  • Dimensions: Height x Width x Depth = 3in x 7in x 5in ( 68mm x 175mm x 124mm )
  • Weight: 3 lb. ( 1.5 kg )
  • Data Storage: 8000 data points (each data point consisting of : Time, Value )
  • Data Download: User-friendly PC-compatible graphical software used for downloading the collected data. Flat ASCII file output can also be generated for further analysis (e.g. Microsoft Excel format)

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