By Cecil L. Smith
A distinct source for procedure measurementBasic method Measurements presents 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 advisor outlines either the method variable being measured in addition to how the proper measuring tools functionality. the advantages of each one expertise are thought of in flip, besides their capability difficulties. either new and current applied sciences, the publication keeps a pragmatic concentrate on effectively deciding upon and deploying the easiest know-how for a given strategy application.The assurance in easy approach Measurements permits the practitioner to: get to the bottom of issues of at present put in units improve at the moment put in units to more moderen and higher applied sciences upload tools for technique variables now not formerly measurable evaluation gadget installations from a point of view of either basic strategy working stipulations and irregular stipulations ensure the easiest know-how for a given set of approach stipulations Designed for quite a lot of technical execs, simple procedure Measurements presents a balanced remedy of the options, history details, and particular tactics and applied sciences making up this severe element of technique development and keep watch over.
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Sample text
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.
To perform the calculation, values must be provided for all inputs. Most measurement models are nonlinear equations, so the values provided for the inputs will affect the value calculated for the sensitivity coefficient. Combined Standard Uncertainty For input xh the contribution to the uncertainty in the measured value is the product of the uncertainty u, for that input and the sensitivity coefficient c, for that input. The combined effect of all inputs gives the combined standard uncertainty uc for the measured value.
The potential of a sale creates an incentive on the part of the manufacturer to assist the user in making this translation. However, the user will have to provide information on the behavior of the fluid whose viscosity is to be measured. 13. Absolute accuracy as a function offlowfor a meter with a stated accuracy of 1 % of the upper-range value. Many statements of accuracy are accompanied by statements regarding process conditions. Furthermore, the accuracy is sometimes stated for measuring some property of air or water, often at or near ambient conditions.