Skip navigation
Go to Global Navigation
Go to Primary Contents
Go to Site Information
Yokogawa Corporation of America

YOKOGAWAYokogawa 100th Anniversary

North & Central America



Tunable Diode Laser Spectrometer

Tunable Diode Laser Spectrometer (TDLS) is a laser-based gas analyzer with fast-update optical analysis. The TDLS line offers measurements for process gas, flue gas, impurity analysis, custody transfer, safety, with in-situ and extractive methods supported.

In the chemical, power and refining industries, Yokogawa TDLS technology is acknowledged in a 2012 EPRI research study and the API 556 standard as the technology required for safe and environmentally responsible combustion applications.

The TruePeak Tunable Diode Laser Spectrometers operate by measuring the amount of a laser light that is absorbed as it travels through the gas being measured. Involving 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).

Fired heaters are integral to industrial processes, including hydrocarbon processing and power generation. Specifically designed for the reaction of fuel and air to produce extremely high gas temperatures, heaters transfer this energy to potentially highly flammable process fluids via heat exchangers. They consume large quantities of fuel, produce large quantities of emissions and are a potential safety hazard to personnel and plant.

Yokogawa TDLS analyzers help control fired heater combustion with ever greater accuracy and reliability. There are measureable rewards for operating fired heaters at Low Excess Air (LEA) levels. In LEA combustion control, the lowest level of fuel is consumed and the products of combustion are cooled the least by unused excess air.

The cost benefits of these efficiencies are considerable, with just a single percentage saving in fuel enabling savings of tens or even hundreds of thousands of dollars per year. Controlling air levels just above the point at which incomplete combustion starts also enables the "cleanest burn," helping plants meet environmental emissions requirements. This in particular reduces the emission of NOx.

In-Situ Gas Analyzer TDLS200

The TDLS200 is designed to make fast, accurate measurements of gases including oxygen (O2), carbon monoxide (CO), methane (CH4), moisture (H2O), carbon dioxide (CO2), ammonia (NH3), and hydrogen chloride (HCl). It is ideally suited for environments involving changing pressure or temperature.

Extractive O2 Analyzer TDLS220

The TDLS220 is specifically designed for accurate, reliable and low maintenance measurement of volume percent (vol%) oxygen (O2) for safety and process applications. It is a viable alternative to paramagnetic O2 analyzers.

Extractive Impurities Gas Analyzer TDLS500

The TDLS500 is a continuous gas analyzer with parts-per-billion (ppb) detection limits and no cycle time using a multi-pass optical bench.  The common measurements include acetylene (C2H2), ammonia (NH3), methyl-acetylene (m-C2H2), hydrogen sulfide (H2S), and carbon monoxide (CO).