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Title: Electronic Density Measuring System
Author: Milton H. November
Source: 1971 Appalachian Gas Measurement Short Course
Year Published: 1971
Abstract: Todays instrumentation engineers are faced with an ever-increasing need for precision density measurement of fluids for a host of industrial applications. The criteria for such an instrument in the most general terms are: 1. Suitable for continuous industrial operation. 2. Applicable to liquids, gases, slurries, etc. 3. Exhibit a high order of precision (better than 0.25% reading). 4. Have a fast dynamic response. 5. Be useful over a wide temperature span without severe degrading of accuracy. 6. Be immune to: (a) flow velocity (b) viscosity 7. Eliminate fluid sampling errors, etc. In view of the persistent requirements, strenuous efforts to find practical solutions to the problem have resulted in the evolution of an interesting form of dynamic densitometer. Before proceeding with the actual device, an understanding of fluid density and the usual forms of techniques employed to measure, is apropos the main portion of this paper.

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