Exhaust Gas Measurements

CEMS are used to monitor exhaust gases for oxygen, carbon monoxide, and carbon dioxide to provide information for combustion control in industry.

They are currently employed as a means of complying with air emission standards.

Plants use CEMS to continuously collect, record, and report the required emissions data.

Analyses might include:

• Dust
• CO (carbon monoxide)
• NOx (nitrogen oxides)
• SO2 (sulfur dioxide)
• HCl (hydrogen chloride)
• CO2 (carbon dioxide)
• H2O (water)
• O2 (oxygen)
• TOC (total organic carbon)

When monitoring emissions, the system must operate continuously and be capable of:

• Sampling
• Analyzing
• Recording the data

at least every 15 minutes, with data averaged hourly.

This means that the operating frequency can either be continuous or activated at a predefined frequency or as needed.