Basic Process Measurements by Cecil L. Smith

By Cecil L. Smith

A special source for technique measurementBasic technique Measurements offers a special source explaining the economic measuring units that gauge such key variables as temperature, strain, density, point, and circulation. With an emphasis at the most typically put in applied sciences, this consultant outlines either the method variable being measured in addition to how the correct measuring tools functionality. some great benefits of every one know-how are thought of in flip, besides their capability difficulties. taking a look at either new and present applied sciences, the publication continues a realistic concentrate on thoroughly picking out and deploying the simplest expertise for a given strategy application.The insurance in easy method Measurements allows the practitioner to: unravel issues of at the moment put in units improve at present put in units to more moderen and higher applied sciences upload tools for method variables now not formerly measurable evaluation machine installations from a viewpoint of either general method working stipulations and irregular stipulations be sure the easiest expertise for a given set of approach stipulations Designed for a variety of technical pros, simple method Measurements presents a balanced therapy of the options, historical past info, and particular approaches and applied sciences making up this severe element of strategy development and keep watch over.

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Bases for Stating Accuracy The basis on which the accuracy of a measurement device is stated depends on the principles that are employed to design the measurement device. 5 °F ±1 °F Process operations normally depend on the absolute accuracy stated as a value in the engineering units of the measured variable. To compare performance, all expressions of accuracy must be translated to this basis. However, if the configuration parameters of the measurement device are altered, the absolute accuracy may change.

For example, 50:1 is a typical value for the turndown ratio of a magnetic flow meter. If the capacity of such a meter is 100 gal/ min, it can also accurately measure a flow of 2 gal/min. Other Measurements For a given measurement device, the maximum possible measurable value is the upper-range value. The minimum possible measurable value is the lowerrange value. The maximum possible turndown ratio is as follows: „ , . Upper-ranee value Turndown ratio = —— Lower-range value Obviously this equation has problems when the lower-range value is zero, which is unfortunately the case for most measurements for which the turndown ratio is of interest.

Unfortunately, this proves to be a challenge. An approach will be described next, but the discussion also includes at least some of the criticisms of the approach. The GUM Approach The GUM provides a framework for evaluating measurement uncertainty based on a fundamental understanding of the measurement process. The following six steps summarize this approach. 1. Specify the measurand. 2. Model the measurement. MEASUREMENT UNCERTAINTY 3. 4. 5. 6. 33 Quantify the contributors to uncertainty. Determine the sensitivity coefficient for each contributor.

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