Process Equipment Update


DOAS technology D


ifferential optical absorption spectroscopy (DOAS) is based on transferring a beam of light from a


high-pressure xenon lamp, including both the visible spectrum, ultraviolet and infrared wavelengths, over a chosen path and then using advanced computer calculations to evaluate and analyse the light losses from molecular absorption along the path. Because every type of molecule, every


gas, has its own unique absorption spectrum properties, or ‘fingerprint’, it is possible to identify and determine the concentrations of several different gases in the light path at the same time. The DOAS technology is commonly used


in ambient air quality monitoring (AQM), where paths of several hundred metres can be monitored at very low concentrations. The same technology is used for process and emission monitoring (CEM) applications, where an emitter and receiver is typically


Fig. 1. DOAS is based on transferring a beam of light from a special source over a chosen path and then using computer calculations to evaluate and analyse the light losses from molecular absorption along the path.


placed directly on stack or a duct/pipe. The light is captured by a receiver and conducted through an optical fibre to the analyser. The fibre allows the analyser to be installed away from potentially aggressive environments and no part of the system is ever in direct contact with the process environment as an air buffer is used to protect the emitter and receiver. This makes the system extremely reliable, robust and durable over time. One analyser can be connected to


multiple paths through an optical switch (multiplexer) and hence monitor several paths in parallel. ■


For more information ✔ at www.engineerlive.com/epe


Opsis AB is based in Furulund, Sweden. www.opsis.se


Food grade pipework meets EC 1935/2004 and FDA requirements


T


he new Food Grade range from Jacob Pipework Systems meets the stringent requirements of the


European EC 1935/2004 standard, as well as the American FDA food regulations. The new range is a modular, stainless-


steel pipework system with more than 3000 products. More than 1000 of the product components – from the steel parts through


American FDA regulations regarding contact with food. The adhesive-free heat sealed U-shaped


seals not only ensure food grade conformity in compliance with EC 1953/2004 and the FDA requirements, but also have better temperature and tear resistance than conventional adhesive-bonded U-shaped seals.


All components that come into contact


Fig. 2. The Food Grade pipework system from Jacob now offers twofold compliance with EC 1935/2004 as well as FDA requirements for its series manufactured range.


Fig. 1. Twofold compliance in series production – The new Jacob Food Grade range is the first pipework system on the market to offer compliance with both EC 1935/2004 and FDA requirements.


20 www.engineerlive.com


to adhesives and sealing materials – were replaced or redesigned where necessary. That made sure that all the parts of the Food Grade products that come into contact with food satisfy the stringent EU requirements of the EC 1935/2004 directive as well as the


with food are made exclusively of stainless steel that meets the quality standard of V2A/1.4301. The use of adhesives is avoided as far as


possible in the seals that are incorporated in some of the steel fittings. In situations where their use is unavoidable, we use only food- grade adhesives. ■


For more information ✔ at www.engineerlive.com/epe


Jacob Söhne GmbH & Co KG is based in Porta Westfalica, Germany. www.pipe-systems.eu


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