By Hermann Schmalzried
Bridges the distance among the actual and chemical methods of the swiftly constructing box of reliable nation kinetics, utilizing quantitative language practitioners of either methods can comprehend. issues transcend easy diffusion procedure; homogeneous and heterogeneous sturdy- nation reactions, section transitions, and the impression of exterior fields also are handled intimately as are cost delivery mechanisms in ionic conductors, rules of sensor expertise, and corrosion of metals.
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Extra resources for Chemical Kinetics of Solids
As an example, it is a common but poor practice to simply change the color of a process value on a graphic to indicate it has come into alarm. ) The indicator is multiply coded with fill color, a unique shape, and a text designation. 1 psi Suppressed Alarm Figure 4-1: Multiply Coded Alarm Indication Elements Chapter 4–Common DCS and SCADA Alarm Display Capabilities— and Their Misuse 31 Graphics should contain no gratuitous animation elements. It is proper, however, for the alarm indicator to blink for a new, unacknowledged alarm as an attention-getting device.
Absurd? Yes—in an airliner—because people have made intelligent rules about proper cockpit practices and procedures. A plant operator, when managing process upsets, has many similarities to this pilot. Unfortunately, a typical DCS alarm system has many alarms similar in uselessness, with as much negative and distractive effect as this interruption by the flight attendant! Remember, the Alarm Summary Screen is not the control engineer’s dumping ground for miscellaneous status information! In all of these cases, the important principles apply: • Alarms must require an operator response.
The best practice is to use three primary levels of annunciated DCS alarm priority. Your DCS may allow many more than that. Do not succumb to the temptation of using them! Humans are wonderfully able to put things in three categories and to understand items in three categories. Four or five categories are about the maximum; more than that will get cognitively blurred together and become confusing rather than helpful. (Quick! ) Alarm systems from different DCSs may have differing nomenclature for priority levels.