ADS 507165, Installation, Operation And Maintenance Manual

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4-58 ADS ® Manual
upstream into the flow. Choosing this ensures the monitor
analyzes both positive and negative values returned from
the velocity sensor.
‰ Forward Choose this option for monitoring points where
reverse flows are not expected and to ensure the monitor
only analyzes positive values returned from the velocity
sensor. The AV|Max and Peak Combo Sensor typically
are positioned facing upstream into the flow. This is the
most common, and the default, option for selection. ADS
recommends using this setting for most monitoring
applications.
Forward is the default selection for Velocity
Direction .
‰ Backward Choose this option for monitoring points at
which the AV|Max or Peak Combo Sensor has been
positioned facing downstream and to ensure the monitor
only analyzes flows moving
away from the face of the
sensor. One application in which this would be the
preferable option would be for measuring velocity in an
outgoing line following two incoming lines in the
manhole.
‰ Backward Bidirectional Choose this option when the
AV|Max or Peak Combo Sensor is installed facing
downstream and to ensure the monitor analyzes flows
moving both away from and toward the face of the sensor.
This option would be beneficial, for example, when using
a weir to measure overflows with the potential of river
intrusion.
z
Maximum Velocity Select the maximum expected velocity
that will occur at the site for the monitor to use in fine-tuning
the velocity data. The default setting is
Auto , which serves to
optimize the range and resolution of the velocity data samples
to match the characteristics of the flow. However, if the
velocity readings at the location measure at least 10 feet per
second (fps) on a regular basis, ADS recommends choosing the
15 fps option for this parameter. If the location is downstream
from a pump station and displays rapid changes in velocity
from reading to reading, ADS also recommends changing the