Loop Controllers: Lone Logic is More Connected
作者:Mark T. Hoske 发表时间:2005-12-05
lag, among other calculations. A system like DeltaV can offer advantages over such controllers, such as greater reliability and functionality during abnormal events, redundancy, better event and history recording, better interfaces with smart devices, easier configuration, and diagnostics, according to Emerson Process Management. Programming is within a Microsoft Windows environment. www.easydeltav.com Emerson Process Management

Control multiple zones, factors

Omron E5AR 1/4 DIN and E5ER 1/8 D

IN temperature/process controllers are multi-loop models that allow for integrated control of multiple zones or environmental factors, such as temperature, pressure and humidity. A fast sampling response time of 50 ms gives precise control for quick-changing temperatures in critical applications. Fast sampling response time allows the controller to manage signals more precisely. Selectable inputs on all models include: thermocouples, Pt100 RTDs, analog current, or analog voltage. All E5R Series controllers display PV, SP, and MV data simultaneously in a 3-row backlit LCD display for high visibility. E5AR is available in 1-, 2- and 4-loop models, and the E5ER in 1- and 2-loop models. 2-loop models are pre-programmed for cascade control for easy set-up and programming. E5R controllers provide critical control of quick temperature changes, for ceramic heaters, environmental chambers, high-temperature kilns, and furnaces. They can also be used for semiconductor production lines and food and beverage sterilization processes. www.omron.com/oei Omron Electronics

Universal PID control

Universal 535 1/4 DIN single-loop PID process controller can monitor and control temperature, pressure, level, flow, and other analog variables for batch and continuous processes. Available models provide an isolated analog (4-20 mA or 0-20 mA) control signal output that is typically used to regulate a control valve or similar final control element. Models with alarm trip outputs can be used for on/off