The operating principle is explained using a case where water is
supplied from Controllers PDF the water Controllers Manual mains.
Office and apartment buildings normally have a ground tank and an
elevated tank. Water is supplied Controllers PDF from
Controllers Controllers Manual the Controllers PDF water mains into the ground
tank, pumped up to the elevated tank, then distributed to each floor.
When the water level in the elevated tank is low, water is pumped up
from the ground tank to supplement it. When the water level reaches
a certain level, the pump stops. (See figure 1.)
Elevated tanks are controlled in this manner to maintain the water
level within upper and lower limits as shown below.
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