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16
CBX
Cable drum assembly
The cable drum moves the sensor up and down in the clarifier. It is mounted directly on
the axle of a synchronous motor, hidden behind the drum mounting plate, with a very
constant speed. Since the diameter of the cable roll in the drum varies, the speed of the
sensor will vary. It will move slower during the end of the sampling cycle.
The cable and sensor are cleaned by a water spray in the flushing tube mounted below
the SS enclosure during return of the sensor to the home position.
fig 9
Heater & fan
Hidden behind the drum mounting plate there is a heater which is used in cooperation
with the fan to maintain a stable temperature inside the cabinet. The fan is mounted on
the top right side of the cabinet,
fig10
.
fig 10
Flushing tube & valve
The flushing tube contains a flushing nozzle ring that sprays cleaning water around the
sensor and cable during the return or rising of the sensor to the home position.
The flushing valve is controlled by the main control board.
In the top of the flushing tube is the home position sensor. There is an inductive limit
switch in the top of the flushing tube to determine the correct position or home position
of the sensor. There is a SS clip on the cable for the limit switch to detect when in the
home position,
fig 11
.
