ADS Environmental Services IETG FlowHawk QR 775012 A4 - Manual (Page 219)

6-40 IETG FlowHawk Manual
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
Surface 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.
 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 Auto option serves to optimize the range
and resolution of the velocity data samples to match the
characteristics of the flow. The default setting is 10 fps.
 Duration Select the amount of time for the sensor to transmit
and receive the velocity signal based on the noise present at the
monitoring point. Most sites require only a one (1) second
(default) interval. However, sites that experience elevated
noise levels or velocity dropouts to zero require a longer
interval (2).
 Coefficient A Enter the factor (offset) by which to calibrate
surface velocity to ensure accurate surface velocity readings
across all velocity ranges. IETG strongly recommends using
the default setting (0 fps) for this offset; therefore, please
contact IETG before modifying this setting.
 Coefficient B Enter the factor (gain) by which to calculate
surface velocity to ensure accurate surface velocity readings
across all velocity ranges. IETG strongly recommends using
the default setting (1.00); therefore, please contact IETG before
modifying this setting.
 Gain This value represents the factor applied to raw velocity
(RAWVEL entity in Profile) to determine average velocity
(VELOCITY entity in Profile) and to calculate quantity for
typical daily flows. Profile does not apply the Gain to the
velocity readings reported in Diagnostics, where the raw
velocity readings are used for comparison against the manual