High Temperature Air Flow Sensors

OSI's high temperature air flow sensors operate on optical scintillation — projecting an infrared beam across the stack or duct and analyzing the turbulence-induced fluctuations in the received signal. A patented DSP-based algorithm converts these scintillations into accurate velocity readings. Because the measurement is optical and non-intrusive, it is unaffected by temperature, pressure, gas density, moisture, or opacity.

The OFS-2000 standard model measures 0–100 m/sec. The OFS-2000F, designed specifically for flare stacks, extends the range to 0.03–170 m/sec to capture extremely low and high velocity conditions. The LOA-105 for aluminum smelters provides spatially averaged crosswind measurement over baselines of up to 3 km.

No. All OFS series sensors are factory pre-calibrated and feature drift-free measurement — meaning no field calibration is ever required. Each unit includes a built-in automatic calibration check and continuous self-test diagnostics to confirm ongoing measurement integrity, reducing total cost of ownership significantly.

Yes. The OFS-2000, OFS-2000F, OFS-2000W, and OFS-2000 Series sensors are all EPA 40 CFR Part 75 compliant, supporting stack gas flow monitoring at power plants and industrial facilities for regulatory emissions reporting. The LOA-105 holds EPA Method 14 Equivalency Approval for aluminum smelter roof vents.

OSI's high temperature air flow sensors serve power plants, petroleum refineries, aluminum smelters, chemical plants, and waste-to-energy facilities. Key applications include flare stack monitoring, thermal oxidizers, wet scrubbers, bag houses, incinerators, carbon capture systems, and EPA compliance monitoring for NOx and mass emissions reporting.

OSI's optical flow sensors are essentially maintenance-free due to their no-moving-parts design. The only recommended maintenance is semi-annual window cleaning if the environment warrants it. The LOA-105 for aluminum smelters requires a preventative maintenance check every 6 months to verify optical alignment. MTBF exceeds 80,000 hours across the product line.