Continuous Emission Monitoring Systems | Price & Specifications

CEMS (Continuous Emission Monitoring Systems) use physical sensors installed directly on stacks to measure actual emissions in real time. PEMS (Predictive Emission Monitoring Systems) estimate emissions using process parameters and mathematical models rather than direct measurement. CEMS are generally required for regulatory compliance under EPA 40 CFR Part 75, while PEMS may be approved as alternatives in certain applications.

Yes. The OFS-2000 series sensors are fully compliant with EPA 40 CFR Part 75 for stack gas flow monitoring. They incorporate a NIST-certified measurement algorithm supported by over 20 million hours of observation data, making them suitable for power plants and industrial facilities that must meet federal emissions reporting requirements.

No field calibration is ever required. OSI's optical scintillation sensors are factory pre-calibrated and designed to be drift-free for the life of the unit. The only maintenance typically needed is semi-annual window cleaning. Built-in automatic calibration checks and continuous self-diagnostics ensure ongoing measurement integrity without manual intervention.

OSI's CEMS optical flow sensors are deployed across power plants, oil refineries, flare stacks, wet scrubbers, bag houses, incinerators, thermal oxidizers, carbon capture systems, glass furnaces, aluminum smelters, and chemical processing plants. They support EPA 40 CFR Part 75 compliance, mass emissions reporting, and NOx monitoring across a wide range of industrial environments.

The OFS-2000W model features Automatic Gain Control (AGC) technology specifically designed to compensate for signal attenuation caused by particulate matter, moisture, and variable opacity. This makes it ideal for wet scrubbers, bag houses, and high-dust environments where conventional sensors lose accuracy. Measurement accuracy remains at ±2% regardless of opacity variations.

OSI's standard OFS-2000 covers 0–100 m/sec, while the OFS-2000F model for flare stacks extends to 0.03–170 m/sec — one of the broadest ranges available for industrial stack flow measurement. All models deliver ±2% accuracy using patented optical scintillation technology. The true cross-stack measurement method provides spatially averaged velocity for more representative flow data.