Tunable Diode Laser Spectrometers

What are Tunable Diode Laser Spectrometers (TDLS)?

Tunable Diode Laser SpectrometerOptimize combustion, increase throughput, reduce emissions, and increase safety

The TruePeak Tunable Diode Laser Spectrometers (TDLS) operate by measuring the amount of laser light that is absorbed as it travels through the gas being measured. The TDLS line offers measurements for process gas, flue gas, impurity analysis, custody transfer, safety, with in-situ and extractive methods supported. By utilizing no sensor contact with the process and no moving parts, it leads to a high mean time between failures (MTBF) and hence a low long-term cost of ownership (LTCO).

  • In-Situ Gas Analyzer TDLS8000

    Yokogawa’s new TDLS8000 houses all of the industry’s leading features in one robust device. The platform design is for in situ measurements which negates the need for sample extraction and conditioning.

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What is a Tunable Diode Laser Spectrometer?

A TDL laser spectrometer operates on a fairly simple tunable laser principle. To determine gas concentration, TDLS uses lenses to measure how much light gets lost while traveling through gas.

In-Situ Measurement Allows for Quick Analyzer Response 

Tunable diode laser spectrometers (TDLS) allow for real-time gas analysis that leads to increased efficiency, safety, throughput, quality, and environmental compliance. The non-contacting sensor allows measurements in the most severe conditions, such as high temperature, high pressure, corrosive/abrasive conditions, and high dust loading. This in-situ analyzer eliminates the need for sample handling and extraction and reduces the need for routine maintenance and calibration.

>>> Application Notes


Improved OPEX and Safety

The TDLS8000 is attracting considerable attention from many refinery and petrochemical plants because it requires little maintenance and can measure the concentrations of O2 and CO/CH4 in the radiant section of large-scale combustion furnaces and process heaters in near real-time. This allows an unprecedented opportunity to optimize combustion efficiency leading to increased throughput, reduced emissions, and increased overall asset safety. 

>>> Solutions

What are the Key Benefits of Tunable Diode Laser Analyzer Measurements?

"I just want to make sure that there are no major incidents that occur."

"I need to make sure that we meet regulation standards."

Key Benefit

Industry best practices and standards acknowledge TDLS as the technology required for safe and environmentally responsible combustion applications.

  • SIL 2 and 3 certification
  • Not an ignition source
  • Fast response time (< 5 seconds)
  • No background interferences

Key Benefit

  • Minimal maintenance
  • In-situ installation removes the need for sample handling
  • Sensor is isolated from corrosive and aggressive process components
  • On-board diagnostics with 50 days of spectral and historical data
  • Fully field serviceable

"I need to make sure that all the PMs get done in an 8hr day without any surprises."

"I need to minimize the maintenance turnaround times." 

"I need to be able to chat with a specialist about detailed questions."

"Getting quotes even for simple products is time-consuming when I have to take time out of my already packed day to follow on status." 

Key Benefit

  • Dedicated application and post-sale resources guarantee timely quotations and response
  • Filling out data sheet or contact us will ensure the fastest possible response

Key Benefit

  • Dedicated support staff and regional support specialist are available to help you tailor the appropriate products to your application needs
  • Analytical technical specialist are available to help assess current analyzer installation and provide recommendation or justify ROI for installations
  • Full turnkey startup and commissioning for users with limited resources

"We use old technology because we can't seem to justify the upgrade."

"I am concerned with the plant engineering resources utilized to make modifications or maintain the systems. There just is not enough people."

Industrial Applications of a Tunable Diode Laser Absorption Spectrometer

The TDLS8000 tunable diode laser spectrometer has the following measurement applications:

  • Oxygen concentration in oil refinery hydrocarbon vapors
  • Oxygen concentration control with ethylene oxide reactors
  • Oxygen concentration in tank headspace gas

>>> Application Notes



Descripción General:

Electrolysis plants create hydrogen and chlorine from a brine solution. Chlorine gas generated from the anolyte of the electrolysis tank generally contains between 0.5 to 2.0 vol% H2O. The sample is then cooled and filtered to remove brine, subsequently coming out as wet chlorine gas. The wet gas is sent to a drying tower where it is treated with sulfuric acid to get moisture down to the ppm level. 

Descripción General:

En el mantenimiento y la administración de plantas industriales, monitoreo del pH de las aguas residuales / ORP es a la vez una obligación legal y una necesidad necesaria para la protección del medio ambiente. El Monitoreo sin estar atento puede llevar a consecuencias graves.

Descripción General:

Es necesario el manejo de H2S del gas de escape en calderas de recuperación de lejía negra para cumplir con las normativas ambientales.

Descripción General:

Tomando en cuenta las cuestiones ambientales y de seguridad tales como la eficiencia de combustión y la disminución de NOX y CO en los gases de escape, se ha vuelto importante para controlar la concentración de O2 en los procesos de incineración de basura.

Yokogawa Technical Report
Descripción General:

In recent years, shale gas extraction technology has made rapid progress, inducing a shale gas revolution mainly in the USA. Thus, the need for analysis of hydrocarbon gases, including natural gas, is expected to grow rapidly. Traditionally gas chromatography has been used for the analysis of hydrocarbon gases; it can accurately measure the concentration of each hydrocarbon component in a sample of natural gas.

Descripción General:

Spectrometric technology can assess many critical characteristics about products, but it has limits. It can be challenging to determine when the line has been crossed

Medios de Comunicación
Descripción General:

Tunable diode laser analyzers optimize combustion through direct measurement of O2, CO and methane.

Descripción General:

SABIC Turns to Yokogawa TDLS Analyzers to Enhance Safety Functions and Production

Medios de Comunicación
Descripción General:

With fired heaters, users hope to get greater efficiency and reduced emissions but often are disappointed. Given the number of fired heaters operating every day and their importance in the process industries, any improvements realized across the board will have huge impacts. More units can reach their potential with some simple changes in work practices and technology upgrades.

Medios de Comunicación
Edition 1
Descripción General:

The EPA rule, 40 CFR 63 Subparts CC and UUU, is forcing refineries to monitor flares. Fortunately, modern analyzer technology makes it possible to meet the requirements, generate the necessary reports, and stay in compliance.
Here’s how to select the right analyzer to meet these demands.


Documentos y Descargas


Descripción General:

Yokogawa Advanced Solutions recently sat down with László Cserna, Senior Project Manager at MOL Group where together we recently implemented the Yokogawa CombustionONE Furnace Optimisation Solution.

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