Wet Gas Flow Measurement — Differential Pressure Metering

OSI's sensors measure gas flow using patented optical scintillation technology. The sensors detect natural refractive index fluctuations in the gas stream caused by turbulence and temperature gradients. A NIST-certified algorithm then converts these optical signals into accurate velocity and volumetric flow data — entirely non-intrusively, with no physical contact with the gas stream and no moving parts. This differential pressure metering approach delivers ±2% accuracy across velocity ranges of 0–170 m/sec.

OSI's optical scintillation technology measures the natural refractive index fluctuations in a gas stream caused by turbulence and temperature gradients. A patented NIST-certified algorithm converts these optical signals into accurate velocity and flow data — entirely non-intrusively, with no physical contact with the gas stream and no moving parts.

Yes. All OFS-2000 series sensors are designed to meet EPA 40 CFR Part 75 requirements for continuous emissions monitoring at power plants and industrial facilities. The sensors provide compliant stack gas flow data used for mass emissions reporting in pounds of pollutants per day, supporting environmental permit requirements.

No field calibration is ever required. OSI's optical flow sensors are factory pre-calibrated and feature built-in drift-free measurement with an automatic calibration check. The sensors include continuous self-test diagnostics, eliminating the need for any scheduled calibration over the sensor's operational life.

The OFS-2000 covers 0–100 m/sec for general stack and industrial applications, while the OFS-2000F extends the range to 0.03–170 m/sec for flare stack applications where extremely low and high velocities must both be captured. Both deliver ±2% measurement accuracy across their full operating range.

Yes. The OFS-2000W model is specifically engineered for wet scrubbers, bag houses, and high-opacity conditions. It features Automatic Gain Control (AGC) that compensates for opacity variations caused by particulate matter or entrained moisture. The measurement is unaffected by gas density, moisture, temperature, or opacity changes.

OSI optical flow sensors are essentially maintenance-free. With no moving parts, a Mean Time Between Failures (MTBF) exceeding 80,000 hours, and over 800 million field hours of operational data, these sensors operate continuously with no scheduled maintenance or field calibration requirements — maximizing facility uptime and reducing total cost of ownership.