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From finding downed firefighters to digging out hydrants after a blizzard, GPS and its frequent companion GIS can serve many uses for the average fire department. As prices continue to drop, it will be harder to justify not having access to the refined locating and mapping abilities that every department needs.Douglas Page, Fire Chief''s technology correspondent, is a freelance writer based in Pine Mountain, Calif.GPS SatellitesThe current GPS constellation consists of 28 Block II/IIA/IIR operating in circular 10,900nm (20,200km) 12-hour orbits at an inclination of 55 degrees. They are not in geo-stationary orbit. Transformer-rectifiers have moveable parts that/end to wear out. However these machines can produce some of the best arc characteristics.A silicon-coated-rectifier (SCR) power source, electronically voltage-controlled, has no real moving parts other than the primary current contactor and cooling--fan the only parts that will wear out. If fabricator requires pulsed welding, the SCR power source starts to show its limitations and inverters become the power supply of choice.AC-DC inverters, which industrialpowertools convert AC in put frequency to very high frequencies--up to 1,000 times that of input frequency--allow transformers and other components to be small in size and the power supply to be relatively lightweight. This high operating frequency enables the inverter to precisely control output power and to deliver smooth arc initiation with minimal or no spatter. Current ripple is low for a very stable arc:, even at low amperages. And the improved arc control can, in some cases, minimize electrode overheating and fume emissions. Finally, the smallish transformer allows for more efficient use of primary power compared to conventional power supplies. Are you looking for something to replace contaminated fiberglass liners in air handlers and ductwork that won''t just become contaminated again? Then consider the benefits of Engineered Polymer Foam Insulation from Nomaco. It has an efficient thermal resistance, resists the growth of bacteria and mold, has zero water absorption, has no fibers, is nontoxic and is available in sheets from 3/8-in. to 1-in. thickness.The Lifebreath Air Cleaner from Nutech Energy Systems uses a bank of standard throw-away filters. And, no, the air doesn''t flow through the filters, it flows between them. Return air running lengthwise down the face of a bank of filters supposedly results in "near HEPA cleaned air," according to the manufacturer.
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