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Yokogawa Releases TDLS8000 Tunable Diode Laser Spectrometer


Improved reliability and operability for reduced OPEX and enhanced plant safety

Yokogawa Electric Corporation announces that it will release the TDLS8000 tunable diode laser spectrometer on May 7. This new product can quickly make in-situ measurements of gas concentrations in combustion and heating processes that are employed in the oil, petrochemical, electric power, iron and steel, and other industries.

As the successor to the TDLS200 laser gas analyzer, the TDLS8000 offers improved reliability and operability. With this new product, Yokogawa aims to capture a greater share of the gas analyzer market by offering a solution that will make it possible to improve plant efficiency and safety.

Development Background

Companies are always looking for ways to optimize processes by saving energy, reducing CO2 emissions, and improving safety and one way to do this is by optimizing the air-fuel ratio in the combustion process. To accomplish this, sensors are needed that can continuously monitor the concentration of O2 and CO+CH4 in the radiant section of fired heaters.

The TDLS200 laser gas analyzer is capable of quickly performing in-situ measurements of the concentration of near-infrared absorbing gases such as O2, CO, CO2, and NH3. Since the TDLS200 was released in 2008, its high accuracy and precision have earned it a good reputation in the marketplace, and it has gone on to become one of the best-selling instruments of its type in the global market (based on a Yokogawa market survey).

The TDLS8000 is being introduced as the successor to the TDLS200 to satisfy the need for improved operability and to allow for greater adaptability in difficult applications.

Product Features

Highly reliable measurement

The TDLS8000's laser module includes a newly developed reference cell board that improves the reliability of absorption peak detection, which is an important step in the spectral area method. In addition, the receiving unit employs a new auto gain function that can automatically optimize detection sensitivity depending on the measurement object. By increasing the signal-to-noise ratio (S/N ratio), this improves the reliability of measurements taken in coal combustion and other processes where there is high particulate loading. Designed to meet the requirements for SIL2 certification (certification pending) defined by the International Electrotechnical Commission (IEC), the TDLS8000 will play a key support role in ensuring the safe operation of plants.

Improved operability and maintenance efficiency

The TDLS8000 comes with a large 7.5-inch LCD touch screen that can display a greater variety of data. The touch screen replaces the push button interface used with preceding models, making the setting of parameters easier and more intuitive. The light source module containing the laser diode is fully sealed and damage resistant. To facilitate troubleshooting and reduce downtime, this module is able to store up to 50 days' worth of raw data that can be accessed anywhere in the world by, for example, a Yokogawa response center.

Compact size

The redesigned TDLS8000 is just three-quarters the size and weight of the preceding model, allowing it to be installed in a greater variety of locations.
The TDLS8000 is expected to be certified to the IECEx, ATEX (Europe), FM (U.S.), cFM (Canada), and TIIS (Japan) explosion-proof standards. It will be suitable for installation in hazardous areas that required the use of an explosion-proof enclosure.
Major Target Markets

Industries such as oil and gas, petrochemicals, chemicals, electric power, iron and steel, and ceramics


Measurement of O2 concentration in fired heaters for improved safety and lifecycle management
Measurement of CO concentration during combustion process
Measurement of amount of moisture in hydrocarbons and corrosive gases
Measurement of ammonia concentration for leak detection during DeNox process

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