Available from AMS Instrumentation and Calibration , the Hitech Instruments GIR5000 series of landfill and biogas analysers are designed for biogas applications.
The GIR5000 series gas analysers are ideal for biogas, which is usually a mixture of methane (CH4) and carbon dioxide (CO2) together with oxygen (O2) and hydrogen sulphide (H2S) with implications for efficiency and safety.
Available in two or three gas versions, the ATEX certified GIR5000 series biogas analysers come in a range of configurations to suit different requirements.
Methane and carbon dioxide
Methane and carbon dioxide are both greenhouse gases (GHG) with methane being used as an important fuel gas for CHP engines. When not used as fuel, methane is flared off to produce the less harmful carbon dioxide. NDIR sensors in the GIR5000 series biogas analysers measure methane and carbon dioxide. The sensors are specially designed to withstand the damp, corrosive atmosphere often found in these applications.
Oxygen is an important process indicator in both landfill and digester gas. A low reading in landfill gas might indicate the presence of an underground landfill fire, while a high reading may indicate over-extraction from the site. A high reading in digester gas may indicate a decrease in microbial activity due to poisoning.
GIR5000 series biogas analysers employ a special electrochemical cell designed for use in the presence of acidic gases such as carbon dioxide.
Present in landfill and digester gas in varying amounts depending on the substrate composition, hydrogen sulphide can be extremely corrosive to generator sets with continuous measurement preventing costly damage.
Hitech offers a unique system, which allows for continuous measurement of H2S. At 2000ppm H2S, good sensor lifetime can still be achieved.
Hitech provides internal filters, an internal pump and low-flow alarm as standard because sample conditioning is important in the variable conditions encountered in biogas applications.
An external coalescing filter is highly recommended and cooling options can also be offered to remove water. The enclosure itself contains a small heater to ensure that water vapour does not condense in the analyser.