Axetris AG a Company of the Leister Group

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Laser Diode Gas Detectors for OEM Integration

Laser Gas Detector – Brochure ENG (PDF)
Laser Gas Detector – Brochure CHI (PDF)
Laser Gas Detector – Brochure JAP (PDF)

Axetris’ Laser Gas Detectors (LGDs) are self-contained, ready-to-use modules for the measurement of gases such as NH3, CH4, H2O, CO2, HCl, HF or O2. The modules are designed for integration by Original Equipment Manufacturers (OEMs), active in the field of gas detection and monitoring in diverse industries. Typical applications include process control, emission & environmental monitoring, safety and air conditioning. Based on state-of-the-art Tunable Diode Laser Spectrometry (TDLS), the laser gas analyzer modules have virtually no cross-sensitivity with other gases and feature an innovative, patented measurement principle eliminating the need for a reference-channel.

Axetris’ Laser Gas Detectors
Benefits Laser Gas Detection Applications
  • Optical, contact-less, acurate laser measurement
  • High selectivity
  • Fast response
  • Self-contained, easy to integrate
  • Continuous sensor status monitoring
  • Calibration-free
  • Low cost-of-ownership
  • Hot-gas measurement option up to 190°C
  • Process control:
    SCR, incineration, combustion processes, ...
  • Emission monitoring:
    power generation, engine development, ...
  • Environmental monitoring:
    Landfills, green-house gases, livestock, ...
  • Safety:
    Leak detection, refrigeration, toxic gases, ...
  • Climate control & monitoring:
    Livestock, climate chambers & rooms, ...
Technology Brief
Axetris uses proprietary technology-enhanced TDLS for gas detection, where a 0.1 nm narrow bandwidth diode laser beam is scanned across an absorption band of the target gas, performing a high-resolution near-infrared absorption measurement. Electronic lock-in technology allows separating the gas absorption information from electro-optical system information, leading to a detection method eliminating the need for a physical reference channel and offering ontinuous sensor status monitoring. Axetris' LGDs thus present a clear alternative to current sub-optimal detection solutions and combine precise, contactless optical measurements with high target gas selectivity, calibration-free operation, low-cost-of-ownership and easy OEM integration TDLS
Application Examples  
  • Monitoring of NH3 slip in de-NOx processes based on Selective Catalytic Reduction (SCR)
    • In power generation, NOx can be reduced by 99% with SCR where NH3 is injected into the exhaust gas. This process is extensively used in power plants and has found its way into emission control of truck and car diesel engines. In all applications ammonia slip can occur, which either needs monitoring during operation or for system desgin and testing. The Axetris laser gas analyzer is a perfect tool for OEM integrators because it offers a contact-less low ppm-level measurement of NH3 in a heated sample gas cell (190°C) and its extractive set-up allows for simple 0- and span-gas measurements.
  • Environmental monitoring of methane green house & landfill gas
    • CH4 is a potent green house gas - about 25 times stronger than CO2 and outgases from reservoirs, landfills and permafrost soils.
    The LGD can reliably & selectively measure methane in low ppm concentrations without the need for frequent recalibrations. It is thus ideally suited for under-water or remote-site applications, e.g. in environmental research or for tasks related to the commerce of CO2 certificates.
  • Ammonia monitoring & scrubbing in livestock climate, ventilation & emission control
    • Livestock production is a major contributor to ammonia emission and presents a serious health & safety hazard for personnel and animals.
    Since the LGD does not degrade over time like other detection solutions, it enables continuous, low ppm-range NH3 monitoring in livestock related applications, where it is used for effective ventilation control and scrubbing installation management to reduce health threats and odor nuisance from stable discharge air.
   

Detection Limits

Main Target Gasses* Precision 2σ **
1 s integration time		 Precision 2σ **
10 s integration time
NH33 Ammonia *** 0.8 ppm 0.3 ppm
CH44 Methane 0.7 ppm 0.3 ppm
CO22 Carbon Dioxide 10.0 ppm 3.0 ppm

*Other gases on request. **Detection limits at constant system temperature, 20°C, 1013 hPa and 50 ±
1.5 % r.H. Detection limits may change where system temperature changes occur significantly faster
than concentration changes, and/or where a difficult gas matrix is present. *** Detection limits at high
temperature degrade due to spectroscopic reasons; e.g. NH3 at 190°C, 10 s integration time: 0.8 ppm
detection limit.