RATA - Relative Accuracy Test Audit

With new regulations involving emissions trading and reporting, the validity of facility emission data is extremely important. A RATA or Relative Accuracy Test Audit compares data from a facility Continuous Emissions Monitor (CEM) system to independent Reference Method data.


A RATA or Relative Accuracy Test Audit compares data from a facility Continuous Emissions Monitor (CEM) system to independent Reference Method data.  With new regulations involving emissions trading and reporting, the validity of facility emission data is extremely important.

LEHDER typically follows the Environment Canada methodology (EPS 1/PG/7) when conducting RATA programs.

Typical parameters monitored for CEM RATA test programs are:

  • Oxygen (O2)
  • Carbon Dioxide (CO2)
  • Carbon Monoxide (CO)
  • Oxides of Nitrogen (NOx)
  • Sulphur dioxide (SO2)
  • Stack Gas Velocity
  • Stack Gas Volumetric Flow Rate
  • Stack Gas Temperature
  • Stack Gas Pressure

Essentially, the facility's CEM system data and LEHDER's Reference Method data are compared over the same time period (typically as one minute averages over a 30 minute period).  A minimum of nine tests (to a maximum of twelve tests) are completed to evaluate the facility's CEM system performance. LEHDER compares the data after each test to determine the status of the CEM system. Complete pass or fail data is provided to the facility at the end of the day.

LEHDER can provide assistance with CEM Certification Relative Accuracy Tests, Cylinder Gas Audits (CGAs), annual QA/QC Manual audits and any other requirements regarding your facility's CEM System.

Questions?

For more detailed information in regards to LEHDER's RATA capabilities, please contact:

Michael Denomme

Peter Pakalnis