Tunable diode laser absorption spectroscopy (TDLAS)

TDLAS provides on-line, real-time measurements of impurities in process gas streams with low parts-per-million sensitivity. The technology is widely used by gas plant operators for measurements of moisture (H₂O), carbon dioxide (CO₂), hydrogen sulfide (H₂S), and more in gas processes and pipelines. By delivering accurate and robust measurements with fast response times, TDLAS offers higher plant safety, efficiency, and availability with low cost of operation.​

• Offers robust, reliable, and extremely fast analyte measurements
• Helps prevent pipeline corrosion and minimizes explosion risk, ensuring human safety and asset integrity
• Improves process efficiency and plant availability by avoiding shut-in, flaring, and interrupted gas delivery incidents
• Resists interferences or detrimental effects from compressor oil, glycol, methanol, amine, H₂S or moisture slugs, guaranteeing continuous gas deliveries and eliminating transfer disputes
• Allows for a compact, low maintenance analyzer design for low overall cost of ownership​

Endress+Hauser pioneered the use of TDLAS analyzers to detect and measure the concentration of analyte molecules (such as H₂O, H₂S, and CO₂₎ in process gas streams. Our expertise in this field is underscored by our extensive portfolio of patents. Recent advances in semiconductor lasers have made the development of TDLAS for process gas monitoring applications even more technologically and economically viable today.