30 Air Monitoring
EddyPro can use data from additional biological and meteorological (biomet) sensors in computations. This data is used to enhance flux computations, interpret results, and fill gaps in the data set. Not only do these innovations simplify eddy covariance, they save time and improve consistency of computations.
Modular Eddy Covariance Systems
LI-COR provides CO2/H2O eddy covariance systems in both open- path and closed-path configurations. The LI-7500A Open Path
CO2/H2O Analyser provides the lowest power requirements and can be operated with a solar power supply. The LI-7200 Enclosed
CO2/H2O Analyser is best suited for areas with frequent rain or snowfall. It requires more power, but still can be operated by a solar power supply system. Both the LI-7500A and LI-7200 function as an eddy covariance system hub (with the included LI- 7550 Analyser Interface Unit) and provide gas analyser control, sonic anemometer inputs, and GHG file logging for direct processing in EddyPro.
For methane flux measurements, the LI-7700 Open Path CH4 Analyser is a drop-in addition to LI-COR eddy covariance systems.
Methane data are logged in GHG files, making it easy to compute methane flux in EddyPro.
To accommodate different site conditions, LI-COR offers 4 models of sonic anemometer, including omnidirectional and c-clamp styles. Anemometers that are purchased as part of an eddy covariance system include pre-wired cables that provide a simple and robust connection between the anemometer and gas analyser.
Furthermore, LI-COR developed a biomet system that operates in tandem with the eddy covariance station. The biomet station can record data from nearly any additional sensor, provide system control for automated sensors, and can record data from well
over 40 additional channels. Biomet data are also recorded in the self-contained GHG files.
LI-COR offers a heavy-duty scientific instrument tripod that will support the eddy covariance system in high wind conditions. It is available with instrument mounting accessories to accommodate most station and sensor requirements. We also provide resources to help select suitable solar power supplies and telemetry components.
Training and Support
Measuring greenhouse gas emissions involves more than just sensors and systems – training and support are useful to ensure proper deployment and operation of systems. LI-COR provides training opportunities around the world to help people learn to use the eddy covariance method for emissions monitoring. Three-day training courses cover topics from system setup, deployment, maintenance, and data processing. To learn more, review the training schedule at
http://www.licor.com/ec-training or download a free copy of “Eddy Covariance Method for Scientific, Industrial, Agricultural, and Regulatory Applications” from
http://www.licor.com/ec-book.
Today it is more important than ever to measure greenhouse gas exchange, with benefits that determine the allocation of carbon credits, improve agricultural productivity, and explore the relationship between greenhouse gases and climate. As more organisations need to account for sinks and sources of greenhouse gases, LI-COR continues to develop technologies and new products that make this possible. Now non-experts can deploy eddy covariance systems, compute greenhouse gas flux, and help contribute to greenhouse gas accounting anywhere in the world. Contact LI-COR to learn more about eddy covariance systems.
LI-COR provides training and educational resources to help people learn how to use eddy covariance to measure emissions.
Open path and enclosed path eddy covariance systems are compatible with omnidirectional and c- clamp style anemometers. They are available with a tripod, mounting hardware, and accessories.
The New NOxOx Gas Analyser
Combining NOx and O2 measurements is the minimal configuration for an extractive continuous emissions monitoring system (CEMS). It makes a simple and cost effective approach to meet legal requirements as some countries impose a special NOx tax for emission loads. Selective catalytic reduction systems are another example for use of this information.
Eco Physics (Switzerland) has accomplished such a compact system without sacrificing analytical truth by utilising the most acknowledged technologies: Chemiluminescence detection (CLD) for nitrogen oxides measurement and a paramagnetic cell for the determination of the oxygen values. These measurement methods stand for a vast dynamic range, high accuracy, perfect linearity and great reliability.
The new instrument is based on Eco Physics proven CLD 60 series with a state-of-the-art man machine interface. The colour touch screen shows data or complete records in graphical mode. On line curves are available as well. Extensive data storage and simple connectivity are implicit features. USB connectors at the front extract data to a memory stick or connect a PC mouse. The HDMI plug allows attaching a bigger screen or a beamer. And the Ethernet socket is your access point to your local network.
For More Info, email:
25874pr@reply-direct.com Continuous Ammonia or Nitrous Oxide Measurements
LSE Monitors (Netherlands) is proudly presenting new high quality field equipment for continuously measuring the concentration of ammonia or nitrous oxide in ambient air. LSE Monitors BV is a joint-venture between the Dutch companies Synspec BV and Sensor Sense BV. Sensor Sense is a young spin-off company from the Nijmegen University and is powerful in developing new commercial concepts for measuring trace gases. Synspec is a well- established company, strong in the development and sales of sensitive VOC analysers.
The technology in their analysers is based on photoacoustics with a quantum cascade laser (QCL). If NH3 or N2O is present in the sample gas, the modulated infrared light generated by the QCL induces pressure waves in the
measurement cell, that are detected by small microphones. The combination of high intensity laser light and sensitive microphones results in extremely sensitive measurements (low ppb range). Because the measurement volume is small, a fast response time can be guaranteed, even at low gas flow.
For More Info, email:
23695pr@reply-direct.com
Are you interested in what you have read but want to know more?
email:
259ad@reply-direct.com AET August / September 2013
www.envirotech-online.com
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