Industrial Electronics

Video: Explosion-proof version of TDLS8200 probe type tunable diode laser spectrometer

20 September 2022

Yokogawa Electric Corporation has developed an explosion-proof version of the TDLS8200 probe type tunable diode laser spectrometer as part of its OpreXTM Analyzer family. The TDLS8200 features low installation cost, high measurement stability and high reliability, and can simultaneously and directly measure concentrations of oxygen plus either carbon monoxide or methane at high speed.

Available models are capable of measuring temperatures up to 600° C and 850° C, and the addition of an explosion-proof version makes it possible to facilitate efficient combustion control and safe operation across a broader range of applications.

Any excess air supplied when controlling combustion in a heating furnace will absorb heat inside the furnace before exiting via the stack. In addition to resulting in heat loss, this can generate large volumes of nitrogen oxides and sulfur oxides, a source of air pollution. If insufficient air is supplied, completeSource: Yokogawa Electric Corporation Source: Yokogawa Electric Corporation combustion will not occur, resulting in energy loss, the emission of carbon monoxide and black smoke, and residual methane. Carbon monoxide and methane are flammable gases that can readily form an explosive mixture with air if allowed to accumulate inside a furnace.

As such, oil and gas, petrochemical, electric power, iron and steel, and ceramics plants must monitor the concentrations of oxygen and carbon monoxide or methane inside furnaces in order to control and thereby ensure an efficient, environmentally friendly and safe combustion process. However, the use of digital devices in zones where combustible gases reach concentrations that result in the risk of an explosion is limited by regional laws and regulations as they have the potential to ignite such gases. To address this need, Yokogawa has developed this latest version of the TDLS8200 probe type tunable diode laser spectrometer.

Dual laser light sources and optics give the TDLS8200 the ability to simultaneously measure oxygen plus either carbon monoxide or methane concentrations for combustion control. Its direct measurement system relies on the use of lasers, which are easier to maintain than conventional sampling systems and are more robust than catalyst-based sensors. This ensures stable, simultaneous and accurate measurement. Also, by adopting a probe design with no sampling device, it is easy to install and replace.

The explosion-proof TDLS8200 conforms to the IECEx explosion-proof standard of the International Electrotechnical Commission (IEC), the FM explosion-proof standards of the U.S. and Canada, and the EU’s ATEX explosion-proof directives.

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