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.

Electrochemical cells manufactured and supplied, industry wide, for NH3 can be affected by other gases. These NH3 sensors can be affected by other gases, such as CO2 and H2S. CO2 in high volumes can have a large negative effect upon your NH3 readings, while H2S has a small positive effect.

Monitoring sewage sludge AD for Southern Water

To check sludge AD, Southern Water uses portable biogas analysers specially developed for AD biogas and based on proven methane and associated gas analysis equipment from Geotech. Southern Water has an important routine; every single day it checks the health of its sewage sludge anaerobic digesters on eighteen sites across Hampshire, IoW, Sussex and Kent.... Read more »
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Future Biogas choose the BIOGAS 5000 and GA3000

Equipment BIOGAS 5000 portable biogas analyser and GA3000 fixed biogas analyser for Anaerobic digestion (crop digestion). It was vital for the customer to know and monitor the CH4, O2 and H2S levels on an ongoing basis; accuracy with those readings was incredibly important. The BIOGAS 5000 in use The customer generates CH4 by the anaerobic... Read more »
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An analyser is only as accurate at the moment of calibration. Following this point infrared benches can drift over time.  However alongside ensuring regular servicing, we recommend you perform regular user calibrations and checks. By using span gases similar in composition to your typical CH4 values, the accuracy of the CH4 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.