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H2S in Crude Oil Analyzer

Accurately and dependably quantify H2S in light, medium & heavy crude oil with exclusive technology by ASI

H2S in Crude Oil Analyzer

SKU: H2S-in-Crude-Oil-Analyzer | Model #: 205HV        Click here for the laboratory version

The only dependable H2S in Oil Analyzer proven by hundreds of installations and commercial-technical certificates from major oil & gas producers around the world.

H2S in Crude Oil Analyzer

H2S in Crude Oil Analyzer

No false high readings The only detection method specific to H2S only, proven by thousands of applications

Ultra low-maintenance Advanced ASI Tape detector is guaranteed hassle-free. Only a few tape changes per year

Dependable operation ASI Membrane Technology eliminates liquid carry-over that plagues the antiquated headspace sampling systems

No field calibrations The analyzer does not require calibrations in the field based on exclusive ASI technologies

Precise measurement The only technology capable of ultra-low ppm and ppb level analysis


The ability to analytically quantify H2S in light, medium & heavy crude oil and condensate is enhanced with the Sample Transfer Stripper (STS), exclusive ASI Membrane Technology, and ratiometric colorimetric technologies offered by Analytical Systems International. This principle of operation is described in various ASTM methods including D4084-82, D4468-85, and D4045-81.

The effective process of measuring H2S in crude oil involves representatively separating the H2S from the liquid for precise measurement in the gas phase. The problematic and complicated ‘Headspace’ system, which often suffers from liquid carry-over, is not required for this separation. ASI utilizes the state-of-the-art Sample Transfer Stripper (STS) with exclusive ASI Membrane Technology to efficiently and reliably separate the H2S from the liquid sample for measurement. The STS is an extremely simple device that provides an ultra-clean and dry sample to the detector for analysis. The STS uses 90% fewer parts than the complicated ‘Headspace’ method. This results in radically reduced maintenance requirements when compared to the headspace method and also enhances analytical reliability.  ASI is established as the world-wide leader in H2S in Crude analysis due to the many benefits of this exclusive technology.

The principle of operation is based on a continuous, free-flowing liquid sample into the heated Sample Transfer Stripper (STS) unit which separates the liquids from the H2S gas sample, based in part on Henry’s Law. H2S free carrier air then sweeps the H2S sample to the H2S specific detector for quantitative analysis in ppb, ppm, or percent levels. The analyzer does not require zero or span field calibrations.

The detection technology is based on chemically specific density changes. The advanced sensing tape technology utilized in our analyzers is the only detection method that is specific only to H2S and does not require calibrations in the field. As few as 3-6 tape changes per year are needed. Optical illumination & detection are integrated for maximum resolution and accuracy. Economic payout is increased because of this automated & continuous process analyzer. A laboratory version is also available.  Patents and Patents Pending based on letters that are available on request.

Typical Applications:


Transporting crude oil in truck or vessel can be life threatening to personnel due to unknown levels of hydrogen sulfide contained in the crude. An accident could result in serious injury or death. Other methods to measure H2S include exposing the crude oil to the atmosphere (“Can Test” method, N2 Purge and Trap or lab analysis). The model 205 eliminates health risks of personnel by safely measuring H2S content in a closed loop system, ensuring safety of all operators involved.

Quality Control
Off-spec cargoes and processes incur significant losses due to delays and high costs. “Can Test” method, “Purge and Trap” method and lab analysis are labor intensive, inaccurate and can be dangerous. The model 205 measures H2S 24/7 in real-time, ensuring the most accurate and up-to-date data available to operators. This allows extremely high efficiency ensuring operators meet quality control specifications which saves money. Oftentimes the analyzer pays for itself in only weeks.

Crude Oil Stabilizers / Monitoring for MIC – H2S Cracking
The need to accurately measure H2S in crude is critical to ensure proper product specifications and other purposes. The Model 205 continuously measures H2S to ensure product meets specifications without personnel attendance required or costly lab analysis via inaccurate grab samples.

Corrosion Control
Hydrogen Sulfide is corrosive to pipelines, tanks, FPSO and other holding vessels. The model 205 will accurately measure H2S levels and allows historical data to help treat the H2S before cost intensive measures must be taken.

Condensate is a valuable product that is often transported by truck for sales. The 205 is a dependable analyzer used to accurately measure H2S in condensate for quality control and transportation safety.