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The level of liquid in a tank is maintained in a passive manner, without the use of a liquid level sensor.
English (United States)
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Liquid Level Control
The level of liquid in a tank is maintained in a passive manner, without the
use of a liquid level sensor.
In the figure, tank l0 contains a liquid which must be maintained between the
limits represented by level lines ll and l2. Tank l0 may, for example, be the dip
tank of a web coating line. Thus, as liquid is carried out of the tank on the face of
the web, it is necessary to replenish the liquid.
Liquid is replenished to tank l0 from a sealed air chamber and liquid reservoir
tank 20. Tank 20 itself is replenished by opening valve 2l, and then closing the
valve after tank 20 is filled to the level shown in the figure. Valve 30 is now
opened. Air bleeder pipe 40 connects tank zone ll-l2 to the air chamber at the
top of tank 20. Thus, when zone ll-l2 empties of liquid, air flows from zone ll-l2 to
the top of tank 20. Liquid may now flow from tank 20 to tank l0. This flow
continues until zone ll-l2 again contains liquid. Flow from tank 20 to tank l0 then
ceases. In this manner, tank l0 is periodically automatically refilled in a passive