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Facts at Your Fingertips: Pressure-Based Level Measurement

By Chemical Engineering |

Liquid-level measurement in storage tanks or other vessels is important for avoiding spillage and process upsets. One class of technologies for liquid-level measurement involves measuring the pressure exerted on a gage by the weight of the liquid, and this one-page reference provides information about various devices from this category. The two main types of hydrostatic pressure sensors are head-pressure transmitters and air-bubbler units. Each measures liquid level by detecting the pressure exerted by the weight of the liquid. Hydrostatic pressure sensors are either externally mounted or submersible pressure sensors made for liquid-level applications. Since these sensors are a contact measurement technology, they can be affected by changes in the environment. They should not be used if there are variations in the density of the fluid being measured. Also, error is introduced if the probe is not stationary. Externally mounted sensors. Externally mounted pressure sensors are attached to the bottom or side of a tank. The measurement is based on the distance from the bottom of the tank, the pressure exerted by the liquid in the tank, and the reference pressure from the air above the liquid in the tank. There may be a need to measure…
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