7ML19985FC03 HydroRanger 200 – INSTRUCTION MANUAL Page 67
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Rake (Screen) Control
6 Relay Model
Rake (Screen) Control [6 relay model]
This feature is only available on the HydroRanger 200 6 relay model.
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
P007 (3)
Max differential
between Point 1 and
Point 2 reading also
sets 100% scale for
bargraph and mA
output.
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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