Stack Gas Flow Metering Systems

Yes. The OFS-2000 series optical flow sensors are designed and certified for EPA 40 CFR Part 75 compliance. The underlying measurement algorithm is also certified by NIST (National Institute of Standards and Technology), and the sensors have been used at power plants, refineries, and industrial facilities for EPA-mandated continuous emissions monitoring.

No. OSI optical flow sensors are factory-calibrated and feature a drift-free measurement design. A built-in automatic calibration check and continuous self-test diagnostics are included in every unit. Unlike traditional sensors, OSI systems never require field calibration throughout their operational life, significantly reducing maintenance costs and downtime.

The OFS-2000 covers 0–100 m/sec, suitable for general stack and industrial duct applications. The OFS-2000F is specifically engineered for flare stacks and extends the range to 0.03–170 m/sec, enabling detection of extremely low flow conditions that most conventional flow meters cannot accurately measure.

Yes. The OFS-2000W model is specifically designed for wet scrubbers, bag houses, and high-opacity environments. It features Automatic Gain Control (AGC) that compensates for signal attenuation caused by particulate matter, moisture, or variable opacity, ensuring reliable and accurate flow measurement even in the most challenging stack conditions.

OSI optical flow sensors require a minimum of 2 upstream and 1 downstream pipe diameters of straight duct run at the installation point. They are mounted using a standard ANSI pattern 4-inch pipe flange. Hot tap installation procedures are available, allowing installation without process shutdown in many cases.

OSI stack gas flow metering systems are deployed across power generation, petroleum refining, aluminum smelting, chemical processing, and waste-to-energy industries. Specific applications include flare stacks, thermal oxidizers, incinerators, wet scrubbers, bag houses, sulfur recovery units, carbon capture systems, glass furnaces, and terminal loading facilities requiring NOx and mass emissions monitoring.