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Instrumentation Reference Book, 4th Edition by Walt Boyes

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Chapter 10. Measurement of Level and Volume
P.H. Sydenham and W. Boyes

10.1. Introduction

Many industrial and scientific processes require knowledge of the quantity of content of tanks and other containers. In many instances it is not possible or practical to directly view the interior. Parameters of interest are generally level of the contents, volume, or simply the presence of substances. Sensors may be needed (see Figure 10.1) to detect high- or low-level states for alarm or control use, to provide proportional readout of the level with respect to a chosen datum, for automatic control purposes, or for manually read records.
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FIGURE 10.1.
Schematic ...

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