Measurement Range / Discharge calculation
Setting Description
Offset Sensor (continued)
Blanking bottom > Enter value for adjustable distance above channel- or riverbed that will be excluded in
measurement of velocity profile to eliminate measuring inaccuracies due to interference of
irregular currents or turbulences around sensor housing.
Blanking top > Enter distance value for adjustable zone below water surface that will not be considered for
measuring depending on water level.
Threshold Only applicable for horizontal orientation. Flow velocity measurement only starts if minimum
water level + 0.5 × hysteresis value is exceeded.
> Enter value for minimum water level value.
Hysteresis The specification of a hysteresis increases the system stability. The hysteresis-value is required
for situations with a water level that oscillates around the defined threshold causing the
velocity measurement constantly being switched off and on.
> Enter hysteresis value to define upper and lower limits which have to be exceeded to start/
stop velocity measurement.
Threshold and hysteresis are values used by the software to determine if velocity measurement
depending on the current water level is active or not.
There are two possible situations depending of the direction to which the water level changes.
Situation A
The water level is higher than value of Threshold + (0.5 × Hysteresis).
The velocity measurement will be activated.
If the water level falls below the value Threshold – (0.5 × Hysteresis).
The velocity measurement will be stopped.
Situation B
The water level is lower than value Threshold – (0.5 × Hysteresis).
The velocity measurement will be stopped.
If the water level is rising, the measurement will only start if the value of the water level is
greater than Threshold + (0.5 × Hysteresis).
If the water level rises above the value of Threshold + (0.5 × Hysteresis) the velocity
measurement will be activated.
Angle Beam Default setting: 45 °
(angle beam for vertical measurement direction of area velocity sensor)
If angle beam deviates from 45° due to installation condition (measurement direction is not
vertically), the deviation has to be measured manually and recalculated.
Min Signal > Enter value for minimal signal strength from which measurement is activated.
Example: 50 dB
=> measurement values with signal strengths > 50 dB are considered for discharge calculation.
If no value is entered, signal strengths lower than 35 dB are considered to be no signal at all.
Programming
Page 53 March 2021 HYB-UM-03155-EN-03
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