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Gas Detection Safety Fast with New Carbon Monoxide Sensor
Gas sensing experts, City Technology (UK), have introduced the 4CM, a new carbon monoxide sensor designed for use in the world’s most challenging environments. Developed to meet the most stringent toxic gas and mining standards, the 4CM not only improves the functionality, reliability and effectiveness of PPE in hostile environments, but also demonstrates outstanding performance and stability in temperature and humidity extremes.
The 4CM outperforms other sensors on the market by responding 12% faster to CO hazards and recovering in over half the time of the industry average. This is a major benefit to detection instrument manufacturers keen to improve the performance of their products.
Carbon monoxide (CO) is extremely difficult for people to detect. Exposure to concentrations as low as 100 ppm can be dangerous, higher levels of exposure can be life threatening. In industry, the gas is routinely found in mining facilities, oil and gas plants, petrochemical facilities, steel plants and wastewater treatment plants. It is also major potential hazard when personnel are required to enter confined spaces and therefore effective CO detection is vital.
Rob White, Product Marketing Manager, City Technology, said: “As global leader in the design and manufacture of gas sensors for personal life safety
equipment, the 4CM continues City’s tradition of developing products that make a positive contribution to the preservation of life in challenging environments. The 4CM is the fastest CO sensor on the market, the most efficient in terms of reducing calibration costs and complements our growing portfolio of high performance sensors that include the recently launched 4OXV. Manufacturing on fully automated lines in the UK provides full characterisation of every sensor, traceability down to the component level and guaranteed uncompromising quality.”
The 4CM offers electrical and mechanical backwards compatibility with previous generations of City CO sensors. It has a typical T90 time of seven seconds and a recovery time to an indicated level of less than 2ppm in less than 100 seconds. During 50-day exposures in 50°C and 11% relative humidity, and 50°C at 95% relative humidity, the 4CM operated to specification. The sensor provides excellent accuracy and stability at high and low gas concentrations, meeting the EN45544 requirements for uncertainty, typically achieving 1ppm for zero concentrations and less than 1% variation at 250, 750 and 1000ppm.
Reader Reply Card No. Economical H2S Removal from Biogas
Over the past ten years, Nitto Kohki’s (Germany) Air Blowers have proven themselves, in the Mainland European Anaerobic Digester market, as an economical and non-chemical environmentally
friendly way to reduce the levels of Hydrogen Sulphide (H2S) in biogas. Hydrogen Sulphide must be removed as it is corrosive to engines and can condense as sulphuric acid in engines resulting in large operational costs.
The Nitto Kohki blowers supply a controlled amount of air (approximately 1-2%) into the gas storage volume of the secondary AD tank to feed the special Hydrogen Sulphide eating Thiobacillus bacteria which are cultured on the gas/membrane or gas netting surfaces; netting can be specifically designed to increase the available surface area to maintain a suitable bacterial biomass. The Thiobacillus bacteria
oxidisse the H2S to native sulphur that drops into the digestate – a much underestimated fertiliser. Introducing the correct amount of air into the roof of the AD tank is a fine art; too little air limits the efficiency of the bacteria and Hydrogen Sulphide removal, too much air might start to reduce the efficiency of the anaerobic process within the tank as well as introducing excessive amounts of Nitrogen so reducing the concentration of the Biogas. The pump has to work hard but cannot be large so the Nitto Kohki unit with its unique diaphragm-less linear shuttle configuration give a durable and silent solution.
The Hydrogen sulphide might reduce as far as 20ppm when the process is working at its most efficient, but higher levels might be acceptable depending on the final use of the Biogas – most engines require
less than 200ppm H2S. The amount of air flow required will depend on the process and size of plant, but is often between 100 and 200l/min.
Reader Reply Card No. 67 66
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Optical Gas Imaging Camera Helps Enforce Environmental Protection
FLIR Advanced Thermal Solutions (France) has released a new applications report that describes how the Dutch Environmental Protection Agency (DMCR) is using a FLIR GF320 optical gas detection camera to uphold regulations regarding fugitive gas emissions in Rijnmond, the larger 'Port of Rotterdam' area in the Netherlands.
Due to the presence of the largest seaport in Europe the Rijnmond area is filled with heavy industry, including refineries, waste incinerators, waste dumping sites as well as many large chemical and metallurgical plants. All of these operations bring with them a risk of pollution.
After comparing several techniques, including Differential Absorption Light Detection (DIAL) and Solar Occultation Flux (SOF), the report details how the DMCR opted for a FLIR GF320 optical gas imaging camera as its method of choice to detect airborne environmental pollutants. Technical specialists at DMCR concluded that while traditional methods such as DIAL and SOF are robust and can quantify the emissions these technologies are very expensive to purchase, they are unwieldy, requiring large trucks to carry the equipment, and also complicated to use, requiring a lot of training to be used effectively. In comparison the GF-Series camera was seen to provide considerable benefits in terms of affordability, compactness, portability, and was very easy to use, requiring very little training."
DMCR concluded that the FLIR GF320 optical gas imaging camera is a quick, non-contact measuring instrument that can immediately give the camera operator an overview of a fugitive emission. It can also be used in hard-to-access locations, since it can detect small leaks from several meters away and big leaks from hundreds of meters away, and it can also show leaks in moving transport vehicles, such as tanker trucks, but also barges and rail wagons.
The FLIR GF320 Optical Gas Imaging camera is a real- time infrared camera designed for use in harsh industrial environments. The FLIR GF320 takes advantage of state-of-the-art focal plane array detector and optical systems that are tuned to very narrow spectral infrared ranges. This enables the camera to image infrared energy absorbed by certain environmentally polluting gases. Images are processed and enhanced by the FLIR High Sensitivity Mode™ feature to clearly show the presence of gases against stationary backgrounds. Gases that are detectable by the FLIR GF320 camera appear on screen as smoke plumes.
Reader Reply Card No. AET Annual Buyers’ Guide 2012
www.envirotech-online.com 69 Reader Reply Card No. 68
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