Chinanitrogengenerator penetration coefficient of the particles penetrating
in Top Real Estate Developers
Fri Jun 16, 2017 6:53 am
• 3 Posts
McCloskey advises labs requiring 99.5 percent or higher Nitrogen Generator to go for PSA. Those that can get by on lower-purity nitrogen should consider membrane-based generators. “Labs with both requirements will rarely install both types of systems,” he adds. “They’ll usually use the higher-purity PSA system exclusively.” Thus lab managers generally prefer PSA.
Most laboratory instruments perform more reliably with high-purity gases, and nitrogen is no exception. Although mass spectrometers are not particularly fussy with respect to nitrogen purity, their front-end separation systems, gas and liquid chromatographs, do require high-purity gases, as do many other instruments. It’s also prudent to specify high-purity nitrogen for oxygen-sensitive chemical and biological processes.
Operating costs for PSA are higher per volume of nitrogen generated than for membrane units. Some membrane systems, for example, run on house air pressure and do not use electricity for gas generation. The difference in energy consumption relates to the difficulty of removing oxygen down to levels of a tiny fraction of 1 percent. Manufacturers usually promise additional benefits through the use of other technologies. Some use photocatalytic oxidation or light-based triggers, some use electric processes which emit negative ions to attract positively charged particulates. Some devices use UV ray technology and ozone for filtration. Prices depend on the technology, type of filter used, and the volume of air the machine can clean. How effective are the purifiers?
Most air purifiers have monitors that show levels of particulate matter coming down indoors by 50% to 90%. While international studies have shown PM levels fall with particular machines, there is virtually no peer-reviewed study in India or elsewhere to conclusively establish that air purifiers have tangible health benefits. While standards in the West were fixed decades ago, there are no defined standards in India yet, leading some manufacturers to seek accreditation from international regulators. “We got ourselves accredited from Germany. In the absence of any regulation, many fly-by-night operators are entering the market, the term HEPA is not understood by most Nitrogen Generation System and customers, and anybody can bring a product into the market and define it as an air cleaner,” said Shashank Sinha, Senior General Manager, Marketing, at Eureka Forbes.