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Gas Detection Landfill Gas H2S Increase Measured with High-range Analysers


Hydrogen sulphide levels (H2S) in landfill gas have increased and Geotech (UK) has responded to changes reported by landfill site operators by now offering analysers measuring H2S up to 10,000 ppm. Rapidly rising H2S levels are thought to be caused by waste-to-landfill content changing largely as a result of success in recycling and other initiatives to avoid sending waste to landfill. Previously, H2S was measured at 0-500ppm – still typical for post-scrubber H2S measurement – but higher level monitoring is now essential on many UK landfill sites.


Currently the two main methods of landfill gas measurement are either with portable or fixed-position gas analysers. Geotech reports strong interest in high-


range H2S analysis at 0-10,000 ppm which is an option on its newly launched portable landfill analyser, the GA5000 . This option is also available on the Geotech fixed-position, automated landfill and biogas gas analysers, the GA3000 and the Geotech AEMS system. As well as presenting a significant health risk to operators, H2S can also ‘poison’ the electrochemical cells which provide the most cost-effective solution for


H2S monitoring. Higher H2S levels present a greater challenge. The cells must be regularly purged with clean air. Geotech’s portable analysers are easily purged manually after taking each reading and Geotech fixed position gas analysers purge automatically. Without purging, the life of the H2S cell is dramatically reduced and accuracy compromised. Some analyser systems dilute biogas with air in order to monitor H2S continuously but there is a significant danger of adding error with this approach and it may well not be enough to cope with new, high H2S levels.


For the many landfill operators using landfill gas to produce electricity from CHP engines, accurate H2S measurement is essential. To protect CHP engines, inbuilt gas content and quality sensors may cause auto-shut down to protect engines from corrosive H2S damage and CHP engine manufacturers usually specify an upper H2S limit above which warranties can be invalidated. Consequently, landfill operators often prefer to analyse the gas used in CHPs. If the gas is not suitable for CHP use and without an H2S scrubber, likely to cause damage with excessive H2S, they may divert it to flare or use it elsewhere.


High levels of H2S are often reduced with scrubbing systems and gas analysers can measure levels before and after scrubbing. This monitors scrubber performance as well as avoiding high levels of corrosive H2S reaching and damaging CHPs.


Geotech advises that all landfill gas analysers must be used and managed properly, including appropriate purging, to give operators the reliable gas readings essential for gas field management. As H2S levels rise, so does the need for accurate, dependable landfill gas analysis. Geotech works closely with landfill operators and other stakeholders to ensure equipment is in-line with changing conditions as well as being reliable and


well-supported. Reader Reply Card No. Portable Gas Detector with One-Button Simplicity


Honeywell's (UK) GasAlertMicroClip XT is a member of the GasAlert family of portable gas detectors from BW Technologies by Honeywell. The GasAlertMicroClip XT includes IntelliFlash™, which provides a visual indication of current operation to both the user and supervisor, and “force bump test” and “force calibration” functionality, to help to ensure that GasAlertMicroClip XT is always fully maintained and ready to detect gas.


There is a multi-gas detection of H2S, CO, Oxygen and combustibles; this provides you with a robust monitoring solution designed to meet the challenges of a wide range of industrial applications including confined space entry.


GasAlertMicroClip XT also features a simplified and tamper-proof single button operation and an intuitive interface to reduce training time. It’s slim and compact design also means that GasAlertMicroClip XT is as easy and comfortable to wear as it is to use.


Reader Reply Card No. New Colorimetric


Instrument Offers Simple and Reliable Detection for a Wide Range of Gases


Fixed Gas Detection Systems


For continuous monitoring of combustible, toxic gases and oxygen. Complete range of sensors / transmitters ATEX approved DNV and RINA marked products for marine applications.


Explorer Box 2ch 2 channels wall mount control unit with touch display


DOD Technologies Europe – represented by Solidsense GmbH(Germany) – has launched a new portable colorimetric detection device.


The Next Generation ChemLogic Portable (CLPX) provides powerful portable gas detection to meet a wide variety of applications. Its Improved Optics Design and Automated Optics Calibration makes the CLPX the most reliable, fool proof, user friendly gas detector on the market.


The CLPX is a versatile instrument that can be configured to detect a variety of gases, eliminating the need to purchase different instruments or different gas keys to sample


different gases. Changing the instrument from detecting one gas to another requires a simple change of the cassette.


GasPoint Stand alone single gas detector


The CLPX uses DOD Technologies’ reliable ChemLogic tape technology to detect toxic gases and utilises the most advanced electronics and analysis software to meet the needs of health and safety professionals.


Reader Reply Card No. New Heated Gas Sample Probe GasScreen 160


Control Unit for 16 channels 4-20mA and/or 256s points RS485


In the beginning of the second quarter 2012 JCT Analysentechnik GmbH will introduce a new heated gas sample probe based on the popular JES 301 design.


Eexd Gas Detectors For flammable gases


(%LEL), Oxygen (% O2), and toxic gases (ppm).


The JES 301L will reliably remove dust particles from the sample gas in applications with low dust concentration. This ensures that heated lines will not be clogged with dust particles.


A high power self limited heating element ensures that the gas reaches the analyser unchanged also in rough ambient conditions. The temperature of 180°C also avoids corrosion inside the probe.


Via Pietro Chiesa, 25 r. - 16149 Genova


Tel. (+39) 010-469.56.61 r.a. • Fax (+39) 010.642.42.05 email: info@recomind.com • web: www.recomindustriale.com


Reader Reply Card No. 33 IET March / April 2012 www.envirotech-online.com


Standard flanges allow easy mounting at the stack. Additionally the probe comes with a low temperature alarm contact for remote monitoring. The proven JCT connection system from probe to JCTs JH3F heated hose ensures no cold spots and no condensation at the junction.


Due to an intelligent product design the JES 301L offers easy, tool free and convenient maintenance. As a result the price performance ration during the lifetime is outstanding.


For more information keep an eye on www.jct.at. Reader Reply Card No. 35 34 32 31


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