QAL1 approved particulate CEM which meets US EPA PS-1 requirements for Opacity monitoring from combustion stacks

Robust multi corner cube reflector provides truer reflection of transmitted light compared to traditional “mirror type” reflectors providing greater confidence in measurement.


  • Stacks after bag filters, cartridge filters, cyclones, electrostatic precipitators, no filtration
  • Non-condensing / dry flue gases
  • Incineration
  • Metals (e.g. steel/aluminium)
  • Minerals (e.g. cement/gypsum)
  • Chemicals (e.g. refinery / rubber)
  • Power generation plant (e.g. coal/biomass)

Key Facts

  • Outstanding reliability with no continuously moving parts
  • Automatic in-situ zero and span checking with built-in calibration audit and zero drift correction
  • Dual light source, with patented Flood LED source provides robust check of the detectors and minimises effects of temperature instability

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