TDLAS & QF Analyzers

TDLAS & QF Analyzers

TDLAS & QF analyzers are optical gas analyzers used for online measurement of specific gas components where selectivity, speed, and low maintenance are critical. The category combines tunable diode laser absorption spectroscopy (TDLAS) for targeted analytes with quenched fluorescence (QF) for oxygen measurement across a wide dynamic range.

TDLAS applies laser absorption spectroscopy to measure concentrations of key analytes such as H₂O, H₂S, and CO₂ in process gas streams. QF analyzers are used to measure oxygen from trace to percent levels in gas streams, providing an optical alternative to more maintenance-intensive methods in demanding gas applications.

These optical approaches are positioned as having “revolutionized online gas analysis” for quality control and process control by reducing operational costs and maximizing uptime. High selectivity and fast response enable tighter specification control and quicker detection of upsets, while minimizing manual intervention compared with sampling-heavy strategies.

System implementation typically involves selecting the correct measurement approach (in-situ vs. extractive cell), defining appropriate optical path lengths and response requirements, and aligning calibration/verification practices to the measurement objective. For oxygen-in-natural-gas applications, QF analyzers are positioned for speed, stability, and low sensitivity to contaminants such as H₂S, with low routine maintenance requirements.

Typical applications include natural gas processing and transmission, dehydration monitoring (H₂O), sour gas processing and sulfur-related units (H₂S), CO₂ removal systems, and oxygen monitoring for product integrity and safety. These analyzers are frequently deployed where continuous measurement directly improves product quality, equipment protection, and uptime.

Field Instruments & Controls, Inc. an exclusive authorized representative of sales and service for Endress+Hauser.