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The ball float method is a direct reading
liquid level mechanism. The most practical design for the
float is a hollow metal ball or sphere. However, there are
no restrictions to the size, shape, or material used. The
design consists of a ball float attached to a rod, which
in turn is connected to a rotating shaft which indicates
level on a calibrated scale (Figure A1). The operation of
the ball float is simple. The ball floats on top of the
liquid in the tank. If the liquid level changes, the float
will follow and change the position of the pointer
attached to the rotating shaft.
Figure A1
The travel of the ball float is limited by
its design to be within ±30 degrees from the horizontal
plane which results in optimum response and performance.
The actual level range is determined by the length of the
connecting arm. The stuffing box is incorporated to form a
water-tight seal around the shaft to prevent leakage from
the vessel.
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