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Comment Automation & Control

Level Measurement Devices

By Chemical Engineering |

Effective level measurement helps ensure smooth, continuous processes by maintaining material inventory at economic quantities, and maximizes plant output by preventing spillage, system clogging and process upsets. In chemical process industries (CPI) applications, level measurement of liquids, powders and slurries are often complicated by the presence of steam, dust, foam, turbulence, caking or condensate, as well as high temperatures and pressures. The diversity of challenging conditions dictates multiple technologies for level measurement, which can be divided into point-level measurement and continuous-measurement techniques. Point-level measurement monitors material level at a predetermined point, which could be a high level to avoid spillage, or a low level to avoid running empty. Continuous level measurement monitors materials constantly, noting any fluctuations and changes. Here, brief descriptions of common level-measurement technologies are presented. Mechanical floats — A low-density float is attached to a horizontal rod that is mounted to a tank wall and linked to a switch. As the level rises and falls, the switch opens and closes. Mechanical floats are inexpensive, easy to install and work well for a variety of fluid…
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