A remote field instrument is a device used to sense a physical parameter such as pressure or temperature. This measurement is translated to a signal current in the range of 4-20 mA which is proportional to the measured variable. The 4-20 mA standard has provided an excellent platform for the development of process instrumentation.
York, Penn. —BCX Series washdown-duty ac inverters are available in 1/6 to 5 hp, 230/460 V ac models. The units feature an integral speed potentiometer and run/stop switch. Three internal potentiometers for adjustments and a 0-5 V dc follower are offered. ACE-KL washdown-duty inverters are available in 1/2 to 5 hp, 230/460 V ac models.
Electronic motion control has become a complex combination of diverse elements—motors, drives, amplifiers, motion controllers, embedded chips, feedback devices, software tools, and more. This vast mosaic of solutions is supplied by hundreds of companies with new entrants expanding the list.
As electric utilities become deregulated or privatized, they will have a much greater need for fast and efficient access to information about their operations and how customers use their services.At the same time, deregulation will increase user awareness of the need to review and understand consumption histories, usage characteristics, and the ability to manage load curves.
Breaking the sound barrier isn't easy, especially if you're at ground level standing still. However, that's exactly what engineers at NASA's National Transonic Facility (NTF) can do with their wind tunnel's new 135,000 hp (101 MW) adjustable speed drive and motor system from ABB Industrial Systems Inc.
Older digital systems, even though fully depreciated, drain the enterprise cash flow because of high operation and maintenance (O&M) costs. Much of the true O&M cost is not reported because it involves removing spares from inventory that were valued at the purchase price, not at today's higher replacement cost.
Control-product selection software is assisting automation users and system integrators in specifying the best of a myriad possible solutions for applications. These tools—on 3.5-in. disks, CD-ROMs, or websites—permit vendors to help end-users, consulting engineers, and system integrators figure out what they need.
The core function of power modules is to perform motor power switching and amplification in electric variable-speed and servo drives. Some power modules integrate capabilities and intelligence well beyond these basic functions. They simplify motor drive design via low parts count, compactness, and reliability.
Fort Smith, Ark.— New products from Baldor include spindle drive motors, square flange pump motors, encoderless vector controls, hollow-shaft gear reducers, large 5800 frame motors, and a new line of advanced motion control products. In addition, the company recently introduced its new Standard-E motors that comply with the now-in-effect Energy Policy Act.
"Control products just keep getting more advanced, yet simpler to use,"was the consensus among editors at Control Engineering when it was time for them to choose the best control products of 1997. For the 11th consecutive year, the editors chose the 50 best products based on three criteria: technological advancement, impact on the market, and service to the industry.