Portable Laser Gas Detector for Landfill CH4, NH3 and CO2 Monitoring                                              

Landfill Gas (LFG) is the product of microbiological decomposition of land-filled waste. The bacteria thrive under anaerobic conditions and turn complex organic compounds found in waste matter into primarily Methane and Carbon Dioxide. LFG is approximately 50-55% methane and 40-45% carbon dioxide.

The ETG 6900 P, a portable Laser Gas Detector (LGD) based on Tunable Diode Laser Spectrometry (TDLS), provides a solution to many gas detection challenges in landfill emission monitoring and process control. This technology offers unique advantages like precise optical, contact-less measurements, excellent target gas selectivity and sub ppm-level detectivity.

The TDLS technology is enhanced 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 continuous sensor status monitoring. The ETG 6900 P thus present a clear alternative to current sub-optimal detection solutions and combine precise with high target gas selectivity, calibration-free operation, low-cost-of-ownership and easy use by the customer.

The ETG 6900 P analyser is powered by Li-ion battery and can be used without an AC power supply. It can be used for measurement of the concentration of CH4 ,CO2, and NH3 in sample gases .

Main features are: Very fast CH4 ,CO2 ,NH3 detection, internal sample pump, robust case for portability, zero & span calibration, continuous sensor status monitoring, low cost-of-ownership, touch screen monitor, ethernet and USB, modbus, profibus and ethernet output, arm processor based, and digital input/output. 

Applications include natural gas networks, landfill surface emissions and methane leaks.