Infrared Petrochemical Sensors – Flame Intensity Monitor (FI)

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Product Description

Williamson Flame Intensity Monitors (FI) are the single-wavelength sensors of choice for a variety of flare applications where the more sophisticated dual-wavelength flare products are not appropriate or are not required. This lower-cost technology is also commonly used as a pilot flame detector for ground flares and landfill flares where the viewing distance is less than about 300 feet or 100 meters. Products specifically designated for flame intensity monitoring applications include:

  • Pilot Monitoring of Hydrogen, Ammonia or CO Flames
  • Pilot Monitoring of Ground Flares and Landfill Flares
  • Flame Intensity Monitoring


FI2 vs. FI5
The Flame Intensity monitor is available in two different wavelengths – the FI2 and the FI5.

Sensitive to CO, CO2, and H-C flames.
Not available in EXP configuration.
Only available with D/40 optical resolution
Typically preferred for CO flares

Sensitive to H2, NH4, and H-C flames.
Available in N4, EXP and EXPSS configurations.
Available in D/35, D/100, and D/200 optical resolutions
Typically preferred for Hydrocarbon flares


Key Product Features

  • Thoughtful wavelength selection for maximum sensitivity
  • Model FI2 is recommended for Hydrogen and Ammonia, Model FI5 is recommended for CO Flames
  • Ideal as a Pilot Monitor for Ground Flares and Landfill Flares
  • Increased sensitivity compared to UV flame detectors
  • Adjustable Sensitivity for Optimum Performance

Common Applications

  • Pilot Monitoring of Hydrogen, Ammonia or CO Flames
  • Pilot Monitoring of Ground Flares and Landfill Flares
  • Flame Intensity Monitoring

With over 40 years as an industrial equipment supplier JWII has a profound depth of knowledge in the space of analytical instrumentation and related solutions. We help and advise clients to navigate a broad spectrum of products their uses in industry to meet process control and sustainability goals . Our advanced array of tools, synergized with our team of specialists, enables us to deliver solutions of significant impact. With a legacy marked by consistent achievements, we hold in high regard our steadfast dedication to catering to an international clientele spanning diverse industries and geographies.

Our Premier Suite of Services Encompasses:

  • Installation: Precision-driven integration tailored to specific requirements.
  • Routine Maintenance: Ensuring systems’ longevity and optimal performance through regular oversight.
  • Repairs and Upgrades: Proactive identification and rectification of system inefficiencies, bolstered by the latest technological advancements.
  • Modifications to Current Installations: Adapting existing systems to align with evolving client needs.
  • Emergency Response Repairs: Prompt and efficient solutions for unforeseen system challenges.
  • Commissioning: Comprehensive system design, installation, testing, and maintenance to meet exacting operational standards.
  • On-site Assistance: Dedicated field teams providing hands-on support, ensuring seamless operations irrespective of challenges.
  • This field is for validation purposes and should be left unchanged.
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