ADS Environmental Services FlowAlert QR 775011 A2 - Manual (Page 61)

3-38 ADS FlowAlert Manual
Installing the Float Switch in the
Manhole
Installing the float switch(es) at the proper position and elevation in
the manhole is essential to ensuring the status readings received are
accurate and the float can pivot freely with changing flow
conditions. The elevation at which to hang the float largely depends
upon the project requirements and threshold of notification.
However, the optimal position at which to hang the float is the
center of the manhole above the top of the pipe, to avoid the flow
line. Positioning the float in the center minimizes the possibility of
the float encountering potential hazards or obstructions present in
the manhole, particularly while swaying or pivoting.
Because the float switch is suspended in the air or flow, it must be
secured by its cable. Typically, the optimal location at which to
secure the cable is at the top of the manhole just below the rim.
This is the best way to position the float as close as possible to the
center of the manhole and to make it accessible for service or
replacement.
Warning: When installing floats in or adjacent to pump
stations or other facilities with rotating machinery (such as
mixers), ensure the customer signs off on the installation.
If a float and cables were to come loose, they would cause
severe damage to any downstream rotating machinery.