TDLAS & QF Analyzers

TDLAS & QF Analyzers

TDLAS & QF analyzers are optical gas analyzers focused on high-selectivity online measurements in challenging gas streams. Tunable diode laser absorption spectroscopy (TDLAS) uses laser absorption spectroscopy to measure analytes such as H₂O, H₂S, and CO₂ in process gas streams, while quenched fluorescence (QF) techniques measure oxygen from trace to percent levels.

These analyzers are built for continuous, real-time service and typically expose not only concentration but also supporting diagnostics such as dew point, cell pressure, and cell temperature - useful for validating measurement integrity and identifying sampling or process upsets. TDLAS is explicitly identified as the measuring principle for offered devices in this category.

Benefits center on speed, selectivity, and uptime. The optical techniques are described as having “revolutionized online gas analysis” for quality and process control while reducing operational costs and maximizing process uptime, with QF oxygen analysis positioned for demanding natural-gas oxygen measurement use cases.

Typical deployments include natural gas pipelines, gas processing and LNG plants, refineries, and petrochemical processes where moisture, acid gas, or oxygen content directly affects product quality, custody transfer risk, corrosion control, and catalyst protection. Measurement is used both for specification assurance and for tighter control of treatment and conditioning steps.

Implementation commonly considers hazardous-area requirements and analyzer packaging options appropriate to site classification, with approvals referenced for applicable devices. Low-maintenance performance and stable operation in contaminant-prone streams are key differentiators when comparing optical analyzers to conventional electrochemical or extractive wet-chemistry approaches.

George E. Booth Co., an exclusive authorized representative of sales and service for Endress+Hauser.