Laser 3 Plus Combustion Tunable Diode Laser
Tunable Diode Laser

Obtain fast, in-situ cross-stack measurements with TDL sensing

Tunable Diode Laser (TDL) technology offers a fast-response, accurate measurement that is highly specific to the gas of interest. This non-contact, non-depleting sensing is used in our innovative, compact SERVOTOUGH Laser 3 Plus range of analyzers.

Tunable Diode Laser (TDL) analyzers use a single-line “monochromatic” spectroscopic technique that offers highly stable calibration, a continuous, fast, in-situ measurement, and the avoidance of optical cross-interference from other gases.

The TDL system consists of a laser light source, transmitting optics, an optically accessible absorbing medium, receiving optics and detector(s).

The signal information is held in the gas absorption line shape, which is obtained by scanning the laser wavelength over the specific absorption line. This causes a reduction of the measured signal intensity, which is detected by a photodiode and used to determine the gas concentration and other properties.

Our TDL analyzers use a second harmonic detection (2f) modulation technique that delivers greater accuracy, sensitivity and reliability of measurement, especially in low ppm-level measurements.

Related and alternative technologies

TDL sensing can work alongside Zirconia sensors in combustion applications, providing complementary carbon monoxide and methane measurements. It is susceptible to a range of environmental factors that must be compensated for, including path length variation, window purge gas effects, optical interferences and temperature and pressure changes. A specially configured version of TDL sensing is used in our Laser Moisture analyzers.

Key applications

Process and combustion control

Ammonia slip DeNOx measurements

Safety monitoring

Key benefits

A fast response to changing gas concentrations

Highly specific to the gas being measured

Line lock system prevents signal drift

Ideal for

Cross-stack measurements in process and combustion control applications in hydrocarbon processing and power generation industries.

Explore the TDL analyzers we have for your process

Learn more about all our gas analyzer solutions that use this sensor technology.

Search Servomex Tunable Diode Laser analyzers

Refine by search term

DF-745

SERVOPRO Safe Area

The DF-745 delivers trace and ultra-trace measurements of moisture for ultra-high-purity (UHP) electronic gas checks in LED/LCD manufacturing processes.

  • Delivers trace/ultra-trace moisture measurements
  • For electronic gas checks in LED/LCD manufacturing
  • Can monitor multiple background gases
  • Lower Detection Limit of 1 part per billion
  • Designed for exceptional operational flexibility
  • Ultra-reliable baseline measurements

DF-745 SGMax

SERVOPRO Safe Area

The DF-745 SGMax is designed for the measurement of diverse gas mixtures in specialty gas blending applications.

  • Optimized for speciality gas blending
  • Accurate TDL analysis of trace moisture
  • An adaptable solution for diverse applications
  • Lower Detection Limit of 5 parts per billion
  • Database of 17 standard background gases
  • Virtually eliminates dry down times

DF-750

SERVOPRO Safe Area

The DF-750 is a trace/ultra-trace moisture analyzer optimized for measurements in the ultra-high-purity (UHP) gases used in 300mm semiconductor fabs.

  • A trace/ultra-trace moisture analyser
  • For purity checks in electronics-grade gases
  • Stable, highly accurate TDL measurements
  • 100ppt Lower Detection Limit
  • Low lifetime maintenance requirements

DF-750 ULTRA

SERVOPRO Safe Area

Delivering industry-leading trace/ultra-trace moisture measurements, the DF-750 ULTRA is optimized for quality monitoring in the ultra-high-purity (UHP) gases used in 300mm semiconductor fabs.

  • Delivers industry-best moisture measurements
  • Industry-leading 55 ppt Lower Detection Limit
  • Zero-drift stability extends calibration intervals
  • Measures in N2, H2, He, Ar and O2
  • Designed to meet exceptional gas purity standards

DF-760E

SERVOPRO Safe Area

Designed for quality control applications in UHP bulk gases, the compact DF-760E analyzer is a unique solution for the dual measurement of trace and ultra-trace moisture

  • For quality control in UHP bulk gases
  • Dual moisture and oxygen analysis
  • Trace and ultra-trace measurements
  • Non-depleting Coulometric O2 sensor
  • Robust TDL moisture sensing
  • Exceptional Lower Detection Limits

DF-760E ULTRA

SERVOPRO Safe Area

Designed for industry-leading quality control measurements in UHP bulk gases, the compact DF-760E ULTRA is a unique dual-analysis solution for trace and ultra-trace moisture and oxygen.

  • Dual moisture/oxygen analyser for UHP gases
  • Ideal for quality checking and leak detection
  • Lower Detection Limit of 55ppt moisture
  • Oxygen Lower Detection Limit of 45ppt
  • Combines Coulometric and TDL sensing
  • Broad detection ranges

Laser 3 Plus Combustion

SERVOTOUGH Hazardous Area

Unmatched installation flexibility plus cost and performance benefits, ready for fast, accurate and responsive measurements in combustion and process control.

Laser 3 Plus Combustion Tunable Diode Laser
  • Configured to measure O2, CO, or CO and CH4
  • Highly compact gas monitor
  • Ideal for in-situ cross-stack applications
  • Uses Wavelength Modulated Spectroscopy (WMS)
  • Easily installed by a single engineer
  • Reliable line lock cuvette technology

Laser 3 Plus Environmental

SERVOTOUGH Hazardous Area

Compact, high-performance Tunable Diode Laser (TDL) analyzer, specifically optimized for ammonia slip measurement

SERVOTOUGH Laser 3 Plus Environmental
  • Accurate NH3 measurements in DeNOx processes
  • Compliant with the US EPA PS18 standard
  • Exceptional benefits for clean air processes
  • In-situ cross-stack measurements
  • A highly compact gas analyser
  • Reliable line lock cuvette technology

Laser 3 Plus Process

SERVOTOUGH Hazardous Area

Optimized for the fast, accurate and responsive measurement of process oxygen (O2) in hot or hazardous conditions.

Laser 3 Plus Process Tunable Diode Laser (TDL) analyzer
  • Fast, accurate process control
  • Stable, repeatable O2 measurements
  • Exceptional performance in a compact design
  • Minimal installation and maintenance costs
  • Non-depleting TDL sensor technology
  • Reliable line lock cuvette technology

Learn more about this technology and all the others we provide – download the magazine

Get a free copy of our special Expert Solutions magazine focusing on our complete range of sensing technologies. It’s available to download now.


Need more advice? Contact the gas analysis experts today

If you still need guidance to find the best solution for your process, we’re here to help. Our expert team combines applications knowledge with extensive experience and deep understanding of the sensing technologies available. We’ll help you find the solution that meets your unique needs.


© Copyright 2024 - Servomex is a Spectris company.
Click here to download your selected documents