Excimer UV Fluorescence Technology

What is Excimer UV Fluorescence Technology?

Franek Olstowski is the “Godfather” of the Technology.  He is the Inventor of Excimer UV Fluorescence and other patented technologies from ATOM Instrument.  Recognized as a renowned scientist with a practical working knowledge of optics, electronics, chemistry and physics, Franek has over 40 years of experience in the analyzer industry.  He is also the founder of ATOM Instrument, now a Process Insights brand.

Our patented Excimer UV Fluorescence (EUVF) technology is incorporated into our analyzers.  This technology provide high reliability and confidence of analytical results, reduces operational and maintenance costs, meets today’s emission standards, and provides outstanding analytical performance to meet the challenges of future emission requirements.

Here’s how it works

  • Sample introduced into high-temperature furnace
  • Combined with Air (O2) for oxidative combustion of sample
  • R-SH + O2 —>
  • Water removed by Dryer before remaining combustion byproducts sent to Detection Engine
  • Excited and detected utilizing Patented Excimer UV Fluorescence (EUVF)



  • Higher spectroscopic purity relative to other sources
  • High sensitivity detection
  • Unmatched linear dynamic range
  • Unparalleled nitrogen rejection (low nitrogen interference)
  • Stable, low drift emission
  • Extended lamp lifetime
  • Far exceeds D5453 repeatability requirements
  • High-speed analysis
  • Provide data close to real time process conditions
  • Beneficial for rapidly changing processes
  • Data averaging
  • Provides greater precision for slower processes
  • Tighter control of operations and desulfurization
  • Extended analysis time of individual injections
  • Low maintenance
  • Increases uptime



  • Bottled O2 not needed for analysis
  • Bottled carrier gas not needed for analysis (e.g.: Argon)
  • High speed analysis (60-100s per cycle for majority of applications)
  • Fast response time (99% of response in 1 cycle)
  • Standard operation does not require installation in a shelter
  • Compact footprint
  • Low utility consumption (4-6 weeks on standard 300 ft3 compressed air bottle)

Meets Compliance

  • Environmental Protection Agency (EPA) – United States
  • Canadian EPA (CEPA) – closely aligned with EPA
  • European Union Emission Regulations (EU)
  • Countries implementing equivalent EU Directives
  • Australia
  • China
  • Israel
  • Turkey
  • Bharat Stage Emission Standards (BSES) – India
  • Ministry of the Environment (MOE) – Japan


  • Improved reliability
  • Lower cost of ownership 
  • Improved product quality
  • Efficiency
  • Meet compliance requirements
  • Backed by global service and support

We are committed to solving our customers’ most complex analytical and process challenges across many industries.


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China/APAC +86 400 086 0106


Unsurpassed Nitrogen Interference Reduction

The ATOM Excimer Technology is much less sensitive to interference from molecular-bound nitrogen, which can significantly affect the accuracy of sulfur measurement depending on the composition of the analyzed samples.

The samples demonstrate the superior Nitrogen Rejection obtained with ATOM’s Excimer technology. The certified sulfur sample contains 1.453 ppm/wt sulfur as Dibutylsulfide whereas the nitrogen sample contains 8850 ppm/wt nitrogen as Pyridine. The Blank sample, as well as the balance of the two other samples, was HPLC-grade iso-octane. All samples were run in triplicate and the average of each sample was used to calculate nitrogen rejection according to the formula:

The molecular-bound nitrogen in the pyridine sample is nearly 0.9% by weight, but its response is less than half of the 1.453 ppm/wt. sulfur sample, resulting in a nitrogen rejection ratio greater than 5,000:1. Also note, that the blank sample has almost no detectable response. This unsurpassed nitrogen rejection is highly beneficial in reducing measurement error when analyzing high nitrogen content samples for sulfur content.

Lamp Stability

The graph shows achievable emission stability of ATOM_Analyzer_long_term_lamp_stability ATOM’s Excimer UVF lamp over a period of 5,000 hours (about 7 months). After 7 months of operation, the lamp has only lost about 7% of intensity. Lamp lifetime far exceeds that obtained with other commercially available UF lamps.

ASTM Requirements & Compliance

ATOM Analyzers based on Excimer UV fluorescence technology meet or exceed all operational and performance requirements.

ASTM D5453

Standard Test Method for Determination of Total Sulfur in Light Hydrocarbons, Spark Ignition Engine Fuel, Diesel Engine Fuel, and Engine Oil by Ultraviolet Fluorescence Scope: This test method covers the determination of total sulfur in liquid hydrocarbons, boiling in the range from approximately 25 to 400°C, with viscosities between approximately 0.2 and 20 cSt (mm2/S) at room temperature.

ASTM D6667

Standard Test Method for Determination of Total Volatile Sulfur in Gaseous Hydrocarbons and Liquefied Petroleum Gases by Ultraviolet Fluorescence Scope: This test method covers the determination of total volatile sulfur in gaseous hydrocarbons and liquefied petroleum (LP) gases. It is applicable to analysis of natural, processed, and final product materials containing sulfur in the range of 1 to 100 mg/kg.