User Manual

Configura tion and Activation 6-33
 Transmit Fr equency Select the frequency at which to
transmit the signal. ADS rec ommends leaving the default
setting (Normal) for most applications. However, if hydraulic
conditions at the site are r e sulting in questionable o r e rroneous
readings, consider ap plying one of the other frequency options.
Contact ADS for assistance when necessary.
 Sensitivity Select the appropriate velo c ity sensor sensitivity
from the drop-down list. A sensitivity that is too high may
produce noise, causing interfere nce in the signal and resulting
in spikes in the data. A sensitivity that is to o low can produce
readings that are low in comparison with confirmati on readings.
The defa ult sensitivity is 12.
 Velocity Direction Selec t one of the following o ptions that
reflects the general direction of the flow at the monitoring point
and position of the velocity sensor. The default is Forward.
 Bidirectional Choose this option for monitoring points
that potentially exper ience reverse flows. The Surface
Combo Sensor typically is positioned facing upstream
toward the oncoming fl ow. Choosing this ensure s t he
monito r 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. T he Surface Combo Sensor typically is positioned
facing upstream toward the oncoming flow. This is the
most common option for selection. ADS recommends
using this setting for most monitoring applications. It also
requires less processing time and conserves power.
 Backward Choose this option for monitoring points at
which the Surface Combo Sensor has been positioned
facing d ownstream 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.