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Gas Analyzer How to Measure Low Concentration Gases in the Oil & Gas Industry

| Editor: Dominik Stephan

Tunable diode laser (TDL) technology has proven to be exceptionally reliable for measuring trace gas components like H2O, H2S, CO2, NH3 and C2H2. TDL absorption spectroscopy (TDLAS) is a highresolution technique that enables the measurement of specific gases with precision while avoiding interferences that are common with traditional analyzers.

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The TDLAS technology complements the present day analyzer technologies for measurementof low-range concentration gases in critical and harsh environments
The TDLAS technology complements the present day analyzer technologies for measurementof low-range concentration gases in critical and harsh environments
(Source: Endress+Hauser India )

The traditional gas analyzer market has been consistently grappling with issues related to reliable measurement of low concentration gases. Various principles including infrared (IR), ultraviolet (UV) and visible (Vis) spectroscopy for hetero atomic molecules; lead acetate tape method for H2S, P2O5 and AL2O3 for moisture have been used.

The most common challenges faced by companies include: high maintenance, frequent recalibration, air-conditioned shelters/rooms, accuracy issues with interfering gases, wear and tear with moving parts, and consumables including carrier gas.

TDLAS Technology

The TDLAS technology complements the present day analyzer technologies for measurement of low-range concentration gases in critical and harsh environments, especially in the natural gas processing, transportation, petrochemicals, refineries, LNG and specialty gas industries.

The advantages of this technology include extremely stable measurements. Gases do not come in contact with the detectors, and hence requiring very little maintenance and virtually eliminating requirement of recalibration.

In short, the benefits include:

  • Extremely reliable measurements of low concentration gases, intrinsically stable drift free lasers
  • Robustness of technology to work in extreme environments
  • Accuracy
  • Fast response
  • Low maintenance

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