Xact® 640


Cooper Environmental’s’ Xact® 640 system uses reel-to-reel filter tape sampling and nondestructive energy dispersive X-ray fluorescence (EDXRF) analysis to monitor stack HAP metal emissions. An isokinetic sub-sample of stack gas is taken from the stilling chamber and drawn through a chemically reactive filter tape. Vapor phase metals, including mercury (Hg), are deposited along with the particulate matter (PM) on the filter tape.
The deposit is automatically advanced and analyzed by XRF for selected metals as the next sample is being collected. Sampling and analysis are performed continuously and simultaneously, except during advancement of the tape (~20 sec) and during daily-automated quality assurance checks.
In 2007, through its Clean Air Excellence Award, the EPA recognized the Xact® 640 CEMS as an outstanding achievement in innovative clean air technology. The EPA also approved the Xact® 640 CEMS as an alternative method for periodic Method 29 testing and feed stream



  • Automatic quality assurance, alarms, and control features
  • Gas phase calibration not required
  • Identification and measurement of as many as 23 elements simultaneously (refer to the periodic table on the Elements Supported page of this data sheet)
  • Internal calibration check incorporated with every sample analyzed
  • Proven RTR/XRF technology demonstrated on the ocean floor, Mars, and in thousands of beta attenuation monitors
  • Daily automatic upscale, blank, and flow checks
  • Recognized by the EPA as an innovative clean air technology (Clean Air Excellence Award, 2007)
  • Sampling, analysis, and near-real-time reporting (every 15, 30, 60 and 120 minutes)