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Application 2 Turbulent Liquid Surface
When the level in a wet well gets low the surface can become less reflective for
ultrasound, there are several reasons for this.
The surface is further away, and, can become agitated due to the pumping action,
the inflow to the wet well falls further and so becomes more spread out leading to
increased surface movement and foam on the surface, in extreme instances the
noise of the falling water can lead to the transducer picking up acoustic noise
from the well itself. The spread of the falling water can interfere with the beam
angle.
The solids matter and debris at the bottom of the well can be disturbed leading to
a more uneven surface, also, the benching can become exposed which is not a
good surface to reflect off.
So any combination of the above problems can lead to incorrect or fluctuating
readings at lower levels.
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