Video FAQ
How do OPL and transmission affect TDLS measurements?
How does a TDLS work?
- Laser emitting light on one side and a detector receiver on the other side
- Molecules absorb light when the frequency of light matches the frequency of the intramolecular bonds
- Light absorbance is related to the concentration of the molecule being measured
What affects laser transmission?
- Proper Alignment
- Physical barriers
- i.e particulates, condensation on the window, etc..
What is Optical Path Length?
- Distance between the laser and detector
- Note: Process nozzles are not included in OPL due to their purge
How is TDLS measurement calculated?
- Concentration of molecule / OPL = Average concentration across the process
What are the benefits of a longer OPL?
- More molecules being absorbed creating a stronger absorption single
- Less susceptible to noise
- Improve accuracy
For immediate assistance or to ask your own question, please use the chatbox to the right, contact us at support@us.yokogawa.com, or 1.800.888.6400
Industries
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Chemical
Chemical plants rely on continuous and batch production processes, each posing different requirements for a control system. A continuous process calls for a robust and stable control system that will not fail and cause the shutdown of a production line, whereas the emphasis with a batch process is on having a control system that allows great flexibility in making adjustments to formulas, procedures, and the like. Both kinds of systems need to be managed in available quality history of product, and to be able to execute non-routine operations. With its extensive product portfolio, experienced systems engineers, and global sales and service network, Yokogawa has a solution for every plant process.
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Oil & Gas
Yokogawa has a wealth of experience in every part of the oil and gas business, from offshore and onshore facilities to pipelines, terminals, and deepwater operations. We provide solutions that enhance safety, ensure accurate and reliable operation, and increase plant efficiency.
Related Products & Solutions
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Extractive Tunable Diode Laser Spectrometer TDLS8220
The TDLS8220 complements Yokogawa’s existing TDLS product lineup by satisfying the need for extractive oxygen measurements where in-situ or probe type installations are not applicable and where traditional technologies fall short.
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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.
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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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Probe Style Tunable Diode Laser Spectrometer TDLS8100/TDLS8200
The TDLS Probe brings all the industry leading combustion features into a single-flange explosion-proof device for measuring oxygen, CO, and methane.
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Tunable Diode Laser Spectrometers
- Tunable Diode Laser Spectrometers (TDLS) laser-based gas analyzers
- Fast-update optical analysis
- Safe and environmentally responsible according to industry standards