This article looks at six technologies mechanical floats and displacers, differential pressure, capacitance, ultrasonic, radar, and guided wave radar that are used most often for automated control, and provides practical guidance for choosing among them.
Author: Jerry Boisvert, Siemens Energy & Automation
When it comes to selecting and sizing control valves and positioners, this article not only helps you pick the right one for the right job, but also includes a valuable valve selection chart you can download!
You may not be aware, but a new bus war is being waged in your plant the battle of the motion networks. Control Global's Senior Tech Editor Dan Hebert, PE, provides analysis and commentary on the newest battle over fieldbus.
Things are changing at warp speed. Manufacturing companies are collecting large volumes of data from data systems but improvements are possible only if the data are analyzed and developed into useful business parameters.
The new sampling/sensor initiative (NeSSI) is moving steadily to fulfill its original promise of increased efficiencies, costs-savings, and micro-analytic capabilities despite recent growing pains related to fieldbus.
The more energy prices rise, the more heat integration saves. However, heat integration steps can present complex control problems. Slip-ups in putting control systems in place can make operations nearly impossible. That certainly was the case at one unit using heat recovery.
Author: Andrew Sloley, contributing editor and Carolyn K. Hawley, VECO USA
Profibus-PA and Foundation Fieldbus both reduce cabling cost by sharing wiring among several field instruments. They also save money by reducing the number of instrument interface cards required to connect field instruments to the control system. However, they all save money by being able to use the same field transmitter for a wide range of measured variables.
Faster. Smaller. Smarter. Modular. All express the future of process analytics. And un-stoppable describes the ongoing migration of process analytical instruments to continuous, online, field-mounted use at chemical plants.
Ineffective alarm systems pose a serious risk to safety, the environment, and plant profitability. Too often, alarm system effectiveness is unknowingly undermined by poorly-configured alarms. Read about these 12 common mistakes that can undermine the management of your alarm system.
Nanotechnology is grabbing headlines these days and the growing prospects of its use is spurring increasing attention to safety issues. This article examines the worldwide reaction to burgeoning popularity of the technology and what safety concerns are legit.
No manufacturers claim, third-party analysis or certification report reduces the users responsibility for determining that a product is fit for its purpose. Make sure to properly balance analysis and testing information with field experience.
Author: Angela E. Summers and Susan Wiley, SIS-TECH Solutions, LP
The first plant to go from biomass to syngas to biodiesel is slated for 2007 startup. Once started up early next year, the unit will feed in 75,000 mt/yr of wood chips and straw to make so-called SunDiesel.
Theres no simple solution to achieving accurate temperature measurement. Its a combination of knowing the inherent accuracy of particular sensor types, and how environmental factors can create further measurement uncertainty and the sensor calibration techniques available to reduce this uncertainty.
Author: Cal Swanson, Watlow Electric Manufacturing Co.