Compressed Air Best Practices - November 2008 - (Page 19) Focus Industry STEEL & METALS | 11–12/08 | As an example, in a recent project, we used two Onset HOBO® U12 data loggers to log the current on a screw air compressor. One of the loggers had a fast sample rate — two seconds. The logger filled up in a day, but it enabled us to understand the exact cycling characteristics of the system. At the same time, we installed a second logger and collected data in five-minute intervals over two weeks. This showed us the overall load over time. Together, the loggers gave us a better understanding of the compressor’s performance and we could accurately estimate existing energy use and forecast savings potential. In this particular case, the savings was going to result from changing the sequencing controls to stop two compressors from both modulating at the same time. This method also applies to many other types of equipment with high-frequency rate of change. When monitoring relatively constant loads, a spot real power or power factor measurement combined with current logging can be a very cost-effective approach. Even when load varies, one can use current logging in many applications. The key is properly accounting for voltage and power factor. The voltage part sounds simple, but at ERS we perform a lot of third-party reviews of metering and regularly see analysis that uses current logger readings with assumed standard nameplate 460V, instead of the actual line voltage that of around 480V. The super absorbent way to protect your air tools. Why should you use AquaChek? That’s simple. AquaChek Filters extend the life of your air tools and equipment by eliminating rust and corrosion. How? They use an advanced polymer media that absorbs 28 times its weight in water and traps unwanted particulate down to one-half a micron in size. Any other questions? See the WIX distributor nearest you or visit wixfilters.com. A member of the Affinia family of brands: Aimco • BrakePro • McQuay-Norris • Nakata • Raybestos • Spicer • WIX 19 http://www.wixfilters.com http://www.wixfilters.com
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