Automated Control Systems (ACS) is a technological leader in the Continuous Emissions Monitoring Business. We have provided CEM systems, software, and services to our clients since 1988. ACS has combined many years of experience to provide the most reliable and maintenance free CEM systems on the market today. We have the capability to customize each installation to suit the customer’s needs, from complete turnkey installations to system retrofits. ACS has approximately 350 monitoring systems operating in the U.S.