Oxygen, hydrogen sulfide, and carbon dioxide analyzer and sensor solutions for upstream extraction, midstream processing, downstream refining, and chemical & petrochemical manufacturing operations.
The oil, gas, chemical, and petrochemical industries operate some of the most demanding and hazardous process environments in the world. Accurate measurement of oxygen (O₂), hydrogen sulfide (H₂S), and carbon dioxide (CO₂) is essential throughout the value chain—from upstream production and gas gathering systems to midstream pipeline operations, refining, petrochemical processing, and specialty chemical manufacturing.
Whether monitoring oxygen ingress in natural gas pipelines, measuring H₂S in sour gas streams, verifying inert atmosphere integrity in storage tanks, protecting catalysts from contamination, or optimizing combustion efficiency at fired heaters and flare systems, reliable gas analysis plays a critical role in personnel safety, process reliability, regulatory compliance, and asset protection.
This application note reviews the major gas monitoring requirements across upstream, midstream, downstream, chemical, and petrochemical operations and highlights the Southland Sensing analyzers, sensors, and gas monitoring solutions best suited for each application.
Why gas monitoring matters: Continuous or intermittent measurement of O₂, H₂S, and CO₂ helps protect workers from toxic and explosive atmospheres, verifies process gas purity, prevents equipment corrosion from oxygen or acid gas contamination, and supports regulatory reporting requirements across API, OSHA, and EPA standards.
Designed for continuous oxygen monitoring in demanding oil & gas and petrochemical processes, the OMD-625 delivers reliable trace oxygen measurements for pipeline quality control, inert gas verification, catalyst protection, and process safety. With analog and digital communications for seamless SCADA and DCS integration, it is well suited for unattended 24/7 operation in critical process applications.
Designed for field verification and spot-check measurements, the Portable H₂S Analyzer provides fast, reliable hydrogen sulfide monitoring throughout natural gas processing, refineries, petrochemical facilities, and chemical plants. Its rugged, portable design allows maintenance personnel and operators to quickly verify process conditions in both routine and troubleshooting applications.
The OMD-640 is a rugged portable oxygen analyzer designed for field verification, maintenance inspections, and process troubleshooting throughout oil & gas, chemical, and petrochemical facilities. Ideal for spot-checking oxygen concentrations, verifying inert gas systems, and confirming process conditions, it delivers fast, reliable measurements wherever they’re needed.
The CO₂-625 is designed for continuous carbon dioxide monitoring in natural gas processing, carbon capture skids, and gas treatment systems. Providing reliable online CO₂ measurements, it helps operators optimize process performance, verify gas quality, and monitor carbon capture efficiency while integrating seamlessly into skid-mounted process equipment.
Accurate gas analysis in oil, gas, and petrochemical applications depends not only on the analyzer itself, but also on a correctly designed sample conditioning and handling system. Process streams in these industries frequently contain liquid hydrocarbons, particulates, water vapor, and other contaminants that must be properly managed before the sample reaches the analyzer.
Key sample system design factors include proper pressure letdown, moisture and liquid separation, filtration, flow control, and material compatibility with the process gas composition. In sour gas and corrosive service applications, wetted materials must be carefully selected to avoid accelerated sensor or component degradation.
For hazardous area installations, sample system design must also conform to area classification requirements and applicable electrical codes (NEC, NRTL, IECEx, ATEX).
Southland Sensing provides application engineering support to help customers specify appropriate sample handling systems for demanding oil, gas, and petrochemical service. Contact the factory to discuss your process conditions, gas composition, pressure, temperature, and site classification requirements.
Refer to our O₂ Sensor Compatibility Guide to confirm the correct sensor for your analyzer model and process application.
Our application engineers assist with sensor selection, installation, and hazardous area questions.
Our application engineers are available to assist with sensor selection, installation guidance, and hazardous area classification questions for your hydrogen production system.
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