Siemens HydroRanger 200 Instruction Manual Page 76

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Page 62 HydroRanger 200 – INSTRUCTION MANUAL 7ML19981FC01
Rake (Screen) Control
Rake (Screen) Control
Screens or rakes are mounted on the inflow channel of the wastewater treatment plant
to prevent debris from clogging the equipment.
When material builds up on the screen, a level differential is created, and the water level
is higher in front of the screen than behind it. When this differential reaches the
programmed setpoint, the HydroRanger 200 activates a relay to operate mechanical
rakes that clean the screen and ensure a steady flow.
Setting a Rake Control
Transducer
Two
Transducer
One Rake
Transducer[1]
P006[1]
h[1]
Rake
Debris Conveyer
Transducer[2]
P006[2]
P007[2]
Water Level
h[2]
P007[1]
Flow
Point Three: Level Distance = h[1] –h[2]
Note: transducers may be mounted at variant heights.
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