
OFS-2000W Optical Flow Sensor for Wet Scrubbers, Bag Houses, and High Opacity
- AGC compensates for high opacity conditions
- Maintenance-free with no moving parts
- NIST certified, EPA 40 CFR Part 75 ready
ISO 9001:2015 Quality System
RoHS Compliance
EPA 40 CFR Part 75
OSI's Chemical Industry Gas Flow Meters utilize patented optical scintillation technology to deliver non-intrusive, drift-free gas flow measurement in demanding chemical environments. Designed for flare stacks, wet scrubbers, thermal oxidizers, and EPA 40 CFR Part 75 compliance, these sensors require no calibration and are virtually maintenance-free.




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Optical scintillation technology measures gas flow non-intrusively by analyzing light fluctuations across the measurement path. It is unaffected by gas composition, temperature, pressure, moisture, or opacity changes — making it ideal for the harsh, variable conditions found in chemical plants, refineries, and flare stacks where traditional sensors often fail or require frequent recalibration.
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Gas flow monitoring for sulfur recovery units, catalytic crackers, thermal oxidizers, and emissions compliance reporting.

Flare stack flow measurement across 0.03–170 m/sec range for EPA compliance and combustion efficiency monitoring at refineries.

Stack gas flow monitoring for EPA 40 CFR Part 75 compliance at coal, gas, and waste-to-energy power plants.

Continuous emissions monitoring system integration for NOx, SO2, and mass pollutant reporting at regulated industrial facilities.
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OSI's patented NIST-certified optical scintillation algorithm is drift-free, eliminating costly field calibration and ensuring continuous measurement accuracy over the sensor's lifetime.
Unaffected by temperature, pressure, opacity, moisture, or gas density — OSI sensors deliver reliable ±2% accuracy in flare stacks, wet scrubbers, and high-dust chemical environments.
Trusted by ExxonMobil, Shell, Chevron, DuPont, and the EPA, OSI has accumulated over 800 million field hours powering emissions and flow monitoring worldwide.
Submit your application details and our engineers will respond with a tailored sensor recommendation and pricing within one business day.
For immediate assistance, feel free to give us a direct call at +01 301 963 3630. You can also send us a quick email at info@opticalscientific.com.
For immediate assistance, feel free to give us a direct call at +01 301 963 3630. You can also send us a quick email at info@opticalscientific.com.