DID YOU KNOW?

Some electrolyte compounds can react to other gases than just their target.  This is what we term as a ‘cross gas effect’, whereby the presence of another gas can either positively or negatively affect the mA output of the cell, providing an offset to the true measurement.

As the O2 cell we use is galvanic, it will suffer virtually no influence from typical gases seen in our applications.

GA3000 PLUS fixed biogas analysis system at Harper Adams

Plant manager, James Wood, wanted to monitor biogas composition automatically 24 hours a day, seven days a week.  He wanted his own independent analysis of the gas mix and to record it in detail, especially the percentage of methane, hydrogen sulphide and carbon dioxide. How the company uses the GA3000 PLUS product James said: “We... Read more »
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Biogen Greenfinch Westwood

Beyond keeping the engines running, Westwood’s CHPs have an impressive 99 percent uptime at 41 percent biogas to electricity and useable-heat efficiency. These high rates will make substantially positive profit impact over the several years of investment payback.  Watching the biogas as it comes from the gasholder and travels towards the CHPs and water heating... Read more »
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An analyser is only as accurate at the moment of calibration.  Following this point, electrochemical cells / sensors will begin to degrade and this can be increased through heavy use. However alongside ensuring regular servicing, we recommend you perform regular user calibrations and checks.  By using span gases similar in composition to your typical O2 values, as long as they are above 6% O2, the accuracy of the O2 channel can not only be maintained, but can be improved for your specific application.

Always ensure that your analyser is purged with fresh air between readings and at the end of the day’s readings to ensure no residual gas remains in the analyser.

Other gases

Methane

Methane is 20 times more of a potent greenhouse gas than CO2. The anaerobic process has been replicated artificially in the form of anaerobic digesters to produce cleaner energy to power houses and even cars. Through monitoring with a Geotech analyser you can optimise your process to ensure you make the most from your plant as well ensuring that your engines aren’t damaged if CH4 drops below optimal levels.

Carbon Dioxide

Carbon dioxide is critical to maintain at a constant level during IVF and cell culture growths. It’s also a bi-product of respiration and in confined spaces these levels can increase. Careful analysis of CO2 within an IVF chamber using a Geotech analyser can ensure that embryos develop correctly. The detection of CO2 in confined spaces e.g. a lorry can be indicative of a stowaway.

Oxygen

Oxygen is required in the combustion process where CH4 is burnt to produce heat and energy but too much can cause damage to the engine. Pinking occurs when too much oxygen is present in the engine during combustion. Continuous analysis with a Geotech analyser allows you to set alarms when thresholds of O2 are passed which in turn can close down the engine saving expensive damage and increased downtime.

Carbon Monoxide

Carbon Monoxide is produced during incomplete combustion, this occurs when there is limited levels of oxygen and increased Carbon Dioxide. Levels of 90ppm or greater can be indicative of underground fires on a landfill site. Geotech offers unique technology to gain accurate results about the health of your landfill site and to ensure the safety as well as value of the cell is retained.

Hydrogen Sulphide

Hydrogen sulphide is particularly harmful when biogas is used in internal combustion engines. Its chemical reactions and those of its combustion product - sulphur dioxide - lead to corrosion and wear on engines. Through careful monitoring of this using a Geotech analyser you can ensure the health of your engine and save costs through engine downtime or increased servicing.

Hydrogen

Electrochemical sensors are used industry wide, they are micro fuel cells designed to provide an accurate, stable and low cost measurement technique that can be easily maintained in a portable analyser.

Ammonia

Ammonia is one of the digestion products in anaerobic digestion. If nitrogen-rich feedstocks are used, inhibition by ammonia is often the reason for a process imbalance. Therefore, monitoring NH3 concentrations in the digester helps to estimate if ammonia inhibition is causing the process imbalance.

Nitrous Oxide

Nitrous oxide is widely used in hospitals as a general anesthetic. It’s important that concentrations are accurately measured and also leaks and exposure levels are monitored closely, as long term and repeated exposure can be harmful to human health.