Automated Control Systems Inc. (ACS) is an industry leader in Continuous Emissions Monitoring Systems (CEMS). ACS has over 300 emission monitors operating in the United States.

Environmental Solutions

Continuous Emissions Monitoring

ACS has combined many years of experience to bring the industry the most reliable and maintenance free CEM systems on the market today. Our one of a kind Passive Probe™ makes on-stack maintenance a thing of the past. We customize our systems to reach maximum potential uptime while maintaining data accuracy and full compliance.


ACS develops industry-leading emission monitoring systems; We also provide all the necessary support services. ACS will help you to maintain the data accuracy and uptime required for process control applications and compliance with federal, state, and local regulations. Our 24/7 rapid response team is always available for on-site or remote support.

Opacity Monitoring

Our EPA compliant monitors are built with the highest quality optics available and are matched with an industry leading warranty and support.


ACS™ software is developed in-house and has been refined from over 30 years of on-site use.

Calibration Services

ACS Calibration is an ISO/IEC 17025 Accredited calibration and repair laboratory providing a wide range of NIST traceable calibration services for calibration, test, and measurement equipment including pressure, temperature, dimensional, electrical, force, scales and balances, and torque devices.

CEMS and Opacity Monitor Training

ACS offers CEMS, Analyzer, and Opacity Monitor Training classes at our facility, on site, or online