Relative Accuracy
Test Audits (RATA) confirm that data from a Continuous Emissions Monitor(CEM)
system is in agreement with corresponding EPA Reference Method test results. As
new emissions regulations are mandated, maintaining verified emission data is
an ongoing regulatory process.
Parameters monitored in
a RATA can include:
- 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
A minimum of nine tests
(and up to a maximum of twelve tests) are performed to validate CEM system
performance. AMP-Cherokee compares stack test data to the CEM system to verify
accuracy. All test data is released to the customer at the end of the test day.
A full report will follow thereafter for submission to state or federal
authorities.
Cylinder Gas Audits must be conducted in three of four calendar
quarters, but in no more than three quarters in succession. A CGA applies to
gaseous pollutant or diluent CEMS and is not intended to audit other types of
monitors associated with CEMS such as flow or temperature monitors. A CGA is
conducted by challenging the CEMS (both pollutant and diluent portions of the
CEMS, if applicable) with an audit gas.
