Monday, April 13, 2015

Intro to CEM (Continuous Emissions Monitoring)

Thermox CEM
O2 CEM courtesy of
Continuous emission monitoring systems (CEMs) are typically used to monitor flue gas emissions (the gas exiting to the atmosphere via a flue from an furnace, oven, or boiler).

CEM systems are used by plants and facilities to assure compliance with the EPA’s requirements to limit the amount of certain gasses (such as CO2) into the air. A CEM samples, measures, collects data, records and reports the gas emissions information. CEM systems can also measure and report gas flow, gas opacity and moisture content.

CEM system are made up of a sampling probe, a filter, a sampling line, a means to condition the gas being sampled, a gas used for calibration, and a group of gas analyzers geared toward the gases being monitored.

The most common gases measured are: carbon dioxide, carbon monoxide, airborne particulate, sulfur dioxide, volatile organics, mercury, nitrogen oxides, hydrogen chloride, and oxygen.

The EPA requires a data acquisition and handling system to collect and report the data, so the CEM must operate continually and provide data on an hourly basis.

For more information on CEM (continuous emissions monitoring), contact:

Belilove Company Engineers
P.O. Box 55936
21060 Corsair Blvd
Hayward, CA 94545
Phone: (510) 274-1990
Fax: (510) 274-1999