7.7.1.1. Sludge Level
Sludge level > Enter thickness of sediment / sludge layer ("Height of sediment layer in a cross section (sludge
level)") accumulated on the bottom of a pipe or channel or riverbed.
The program will calculate the area covered with sediment or sludge; this value will be subtracted
from the total wetted hydraulic area for accurate water level and cross-section measurements.
Height sediment layer /
Sludge level
channel
Height sediment layer /
Sludge level
channel
Figure 12: Height of sediment layer in a cross section (sludge level)
7.7.2. Water Level
Select method for water level measurement depending on sensor type and sensor position in cross-section.
• H (Combi sensor): water level measurement with area velocity sensor.
• H (Extern 1): water level measurement with additional water level sensor (for example, hydrostatic pressure sensor or non-
contact ultrasonic sensor).
• H (Fix): fix value for water level.
Water level
Setting Description
Sensor selection
H (Combi sensor) Option for standard use.
Measurement of water level from bottom to top of water surface.
> Tick checkbox for integrated ultrasonic water level measurement with area velocity sensor
installed on the bottom of cross-section.
(value equals parameter name “HUS” in database)
OTE: N Min. water level > 1.6 in. (4 cm).
Click Apply to save settings.
Offset > Enter offset value for area velocity sensor (sensor specific)
(sensor offset = height mounting plate + height sensor housing)
= 0.9 in. (22 mm)
Calibration H > Enter water level value from an external water level measurement (e.g. from water level gauge)
if a deviation with the measured water level value from area velocity sensor occurs.
Click Calculate for correction/adoption of measured value.
Click Apply to save settings.
Programming
Page 47 March 2021 HYB-UM-03155-EN-03
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