ADS Environmental Services FlowAlert QR 775011 A2 - Manual (Page 23)

System Overview 2-11
High and High-High float switches
When the float is suspended vertically above the fluid, the internal
switch remains in a closed state. If the depth level rises and
contacts the end of the float, the internal weight allows the float to
begin to pivot into a horizontal position. If the end of the float rises
slightly above this position (5 degrees above horizontal), the switch
transfers to an open state and communicates the change in state to
the FlowAlert monitor for logging and/or alarming purposes. When
the depth level recedes and the end of the float falls below the
switch threshold, the switch returns to a closed state once again.
Float switch changing orientation with rising flow