70 Gas Detection New Detection Technology Extends CO2 Use in Refrigeration The more widespread use of CO2 in refrigeration is set to gain major impetus from new gas detection technology that enables leaks to be monitored at temperatures as low as -40o C.
The adoption of CO2 as one of the most practical natural refrigerant alternatives to halocarbons is key to reducing and eventually eliminating the use of environmentally damaging greenhouse gases in refrigeration. The breakthrough in gas sensor technology means that the danger to human health involved in using CO2, an odourless but dangerous gas in enclosed environments, no longer poses an obstacle to its use as a refrigerant in commercial and industrial applications. Up until now, no sensor on the market was robust enough to
monitor extreme temperatures for CO2.
Developed and marketed worldwide by Murco Gas Detection (Ireland), the new CO2 gas sensor is based on advanced infrared detection technology with a sensor based on a novel optical design. A major advantage is that it also allows for a smaller housing. The new Murco gas detector also uses a stainless steel case rather than the ABS plastic generally seen in the industry. This robust enclosure protects the unit in difficult working environments such as machine rooms or cold stores.
This new Murco CO2 gas detector unit is approved for temperatures ranges from -40 to plus 50o C and is available in IP66 and ATEX versions. This performance range makes it suitable for many
industrial and food processing environments such as wash down areas and others with high humidity or condensation. Gas detector units are also available for internal fitting in ducts to monitor airflows and in vent pipes to monitoring pressure relief valves
"The special requirements of CO2 in cold storage and other low temperature environments were certainly one driver of this technical development, which we believe is unique," said Dr Lorcan
J. Maher, Managing Director of Murco Gas Detection. "But we are essentially aiming this new generation of infrared CO2 detectors at the general refrigeration market and especially in retailing and food processing.
"No one in the refrigeration industry doubts the importance of CO2 as the emerging natural refrigerant," Dr Maher said. "It has important characteristics to add to its environmentally friendly nature, such as being non-flammable and not directly toxic. CO2 is relatively easy to compress and does not require recovery or recycling which gives significant economic benefits. But those qualities have led to some neglect of leak detection systems despite the occupational health dangers, government regulations and the costs of diminished refrigeration performance because of undetected
leaks." The gas leak detector designs in general use for CO2 are satisfactory for HVAC and ambient temperature applications, Dr Maher said, but until now there has not been a robust, high performance solution for temperatures down to -50o
C and below
The performance range of the new CO2 gas leak detector covers concentration levels from zero to 10,000ppm and above, with typical alarm thresholds of 5,000ppm in refrigeration monitoring and 1,000ppm or above in air conditioning. Some fruit ripening and other industrial applications commonly produce CO2 concentration levels of 2-5 per cent, making timely and accurate monitoring essential for worker safety.
This new generation of Murco gas detectors complements what is already the most comprehensive range gas leak detection equipment on the market. Sophisticated yet robust and reliable, these highly successful gas alarm systems are now used in thousands of installations worldwide to ensure compliance with international conventions and regulations. Murco offers set point systems with remote sensors and controllers and continuous measuring instruments which give the customer analogue, digital or RS485 outputs to interface with most BMS, alarm or control systems.
All Murco units incorporate constant power and system fault monitoring as standard. The Murco Sensor Transmitter range includes state-of-the-art catalytic, semiconductor, electrochemical and infrared models to detect gases in any area, room, zone, airspace or airflow.
Reader Reply Card no 216 New Low-Cost OEM Gas Sensors Feature Improved Communications
Edinburgh Instruments (UK) has a well-deserved reputation in the arena of infra-red gas sensing technology, with a track record spanning over 20 years. The company is continuing to build on this reputation with the introduction of its next-generation OEM sensor, named the Gascard NG.
Utilising established and proven technology from the existing Gascard range of instruments, the Gascard NG not only addresses existing customer requirements, being backward- compatible with the current Gascard model, but it also provides for future extendibility and functionality through improved communications and configuration options.
The main highlights of the Gascard NG are: Backward-compatibility with the current generation of Gascard detectors; Automatic temperature and pressure correction via on-board sensors; On-board RS232 communication; TCP/IP communications protocol option; Field-replaceable IR source; Windows-compatible data logging software; Enhanced configuration options for future extendibility to incorporate additional gas detection technologies.
Initially released in CO2 ppm & low per cent volume configurations, the range has now been extended to include all the different measurement ranges for CO2 as well as the other target gases covered by the current Gascard model, such as CO and CH4.
Reader Reply Card no 217
Behind Worldwide Calibration
Calibration and test gases play a crucial part in every day gas detection. Check gases are key to calibrating instruments at regular intervals and most importantly, verifying the functionality of portable gas detectors. Across the globe, manufacturers, distributors and end customers utilise Euro-Gas cylinders to protect the safety of personnel.
Extend your Company’s Product Portfolio
If you purchase calibration and bump gas from an equipment manufacturer or distributor, you may already be using one of the extensive ranges of gases available at Euro-Gas. A significant number of Euro-Gas worldwide clients take
advantage of a complimentary labelling service to extend their own portfolio of products, with the knowledge that they have the experience and technical support of Euro-Gas behind them.
Gas cylinders can be privately labelled with your own Company logo and contact details. Euro-Gas offers this option as a free of charge service and has a dedicated, friendly team on hand for technical and marketing assistance.
Providing quality and cost effective solutions to the problems of industrial and environmental safety worldwide, Euro-Gas specialise in the supply of:
• Calibration and test gases
• Komyo Kitagawa Gas Detector Tube System • Advanced OEM gas sensors and circuitry
www.euro-gasman.com Euro-Gas Management Services Ltd, Reader Reply Card no 218
Revelstoke House, Stoke Road, Noss Mayo, Devon, PL8 1EY, England. Tel: +44 (0)1752 872222 Fax: +44 (0)1752 872223
Website:
www.euro-gasman.com Email:
euro-gas@btconnect.com
Regular functional testing and calibration is easy and low cost with lightweight, non-refillable cylinders. The perfect sizes for bump testing of equipment are 20 litre and 34 litre cylinders. For regular calibration, 34 litre, 58 litre and the new Euro-Gas 110 litre cylinder, which conforms to the important European Legislation EN12205, provide more gas in a convenient size and at low cost. Out in the field, non-refillable cylinders are ideal where portability is paramount. Where larger quantities of gas are required, Euro-Gas refillable cylinders offer an alternative.
All the latest information, together with downloadable datasheets, can be found at
www.euro-gasman.com.
Reader Reply Card no 219
IET
Annual Buyers Guide 2010
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