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Gas Detection


New Manual for Gas Detection in the Refrigeration Industry


Samon (Sweden) a company focused on gas detection products for the refrigeration industry, has released a new manual on how, why and in what context gas detection equipment shall be used in the refrigeration industry. Current environmental focus and increased focus on personal has led to a couple of new ECregulations, with clear requirements for gas detection equipment in refrigeration applications and how these should be verified and documented. Unfortunately, knowledge about these new rules and regulations are consistently very low and many companies may involuntarily break the law or expose themselves to unnecessary risks.


The F-gas Regulation is effective since May 2006. It is an environmental law designed to deter and prevent emissions of fluorinated greenhouse gases, in line with the Kyoto Protocol. The F-gas regulation is mandatory to comply with for all for all EC and EFTA member countries. According to the F-gas Regulation, all applications containing fillings over 3 kg shall be checked for leakage at certain intervals and applications with fillings> 300 kg shall have a fixed installed system for leakage detection. This system must be in place by 4 July 2010. With an installed gas detection system, control intervals may be doubled.


EN378, the European Standard for the Refrigeration Industry, has been in effect since February 2008 and directly affects the design, installation and maintenance of refrigeration systems in Europe. It states that applications with> 25 kg of fluorinated greenhouse gases and carbon dioxide or > 50 kg ammonia must have gas detection equipment installed in the machine room and in other spaces where people may be at risk. The requirement may also apply to smaller fillings if "Practical Limit" is reached.


New rules and regulations always create uncertainty about how to apply them. Samon’s Guideline is aimed translate the current directives and standards into effective systems solutions and to provide a general overview of when, how and why gas detection equipment is required.


The booklet is useful for everyone that in various ways are involved in installing, operating and maintaining refrigeration systems; because then there is most likely a need for a gas detection system.


New In-Line Vortex Gas Flow Sensors Introduced


Trolex (UK) has introduced an in-line version of its vortex gas flow sensor/transmitter. Designed for in-line flow monitoring of air, gases and vapours in pipelines, the TX5926 and TX5927 models are made to the usual Trolex exacting standards. The two models provide the option of either a 1" or 2" nominal bore and applications for these gas flow sensors range from ventilation systems, cooling systems, and plant protection through to high accuracy transfer metering, environmental control and monitoring as well as for process extraction plants. They are built for use in power plants, process plants, pharmaceutical production, biogas plants, landfill sites as well as cement manufacture and the mining industry – anywhere where gas flow detection in pipes is required.


The new in-line vortex gas flow sensors are certified intrinsically safe, Group I and Group II for use in potentially explosive atmospheres to EURONORM standards.


The vortex flow velocity sensing system provides high accuracy, flow measurement free from drift and mechanical deterioration. As the stream of gas passes through the sensing zone, vortices are generated by a transverse strut or 'Bluff Body' positioned in the flow path. The vortex frequency is proportional to the flow velocity and this frequency is detected by an ultrasound beam accurately located downstream of the strut. This information is processed by a specially designed software programme to provide user configurable information display and a conditioned linear output signal.


Both the TX5926 and TX5927 have programmable information display for zero, span, signal offset, volumetric calculations, engineering units, turndown, damping, display suppression, fault mode, contrast and signal clamp. There are no moving parts on the product and the self-cleaning vortex sensing head gives ultra long-term stability. The units also offer configurable signal turndown and response linearity in true engineering units as well as a volumetric flow calculation facility.


Reader Reply Card no 17


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Reader Reply Card no 18


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Reader Reply Card no 19 New Pump Communicates with Gas Detector


The new G400-MP2 pump from GfG (Germany) communicates with the gas detectors G450/G460. This interaction allows fault indication via the detector display. Low battery, blocked sampling line or interrupted power fault modes are shown on the display and activate different visual and audible warnings.


Gas samples can be taken from distances of up to 100 m with considerable low- pressure performance - the safe solution for confined space measurement.


The G400-MP2 is the only attachable pump available which may remain fixed to the detector. When the pump is turned on, the diffusion inlets are covered and the measurement results are not affected by air flows.


An additional filter system in the sampling line protects pump and sensors from dust and moisture. When the pump is turned off, the gas detector can be operated as usual. The diffusion inlets now allow all gases to enter the sensor chamber.


The G400-MP2 is operated on its own power supply, independently from the gas detector, i.e. the pump does not affect the operational time of the G450/G460. The pump power supply allows at least 10 hours of continuous operation.


Reader Reply Card no 20 Reader Reply Card no 21


AET


April/May 2010


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