Instruction manual
NivuSonic Clamp on
®
Rectangle:
Fig. 8-18
Channel dimensions for Rectangle
Enter the dimensions of rectangular channels here.
Sludge level
The sludge level set is going to be calculated as non-moving channel sub-area
with horizontal surface and will be subtracted from the wetted total hydraulic
area prior to performing flow calculation.
Q
min
(Low flow)
This parameter serves to suppress lowest movements or apparent volumes
arising. Used mainly to measure overflow volumes in constructions which are
permanently flooded by receiving water.
Q
min
: measurement values lower than this one will be set to >0<. Only positive
values are allowed to be set. These values are going to be considered as abso-
lute values and therefore have positive as well as negative effects.
V
min
: low-flow volumes in applications with large profiles and filling levels can be
suppressed by means of this parameter. Lowest velocity fluctuations within
longer periods of time may cause apparently large volume fluctuations which
cannot be gated by using the value of Q
min
.
Flow velocities below this value will be set to „0“ which will set the calculated
volume to „0“ as well. Only positive values are allowed to be set. These values
are going to be considered as absolute values and therefore affect positive as
well as negative velocities!
Both setting options of low-flow suppression have an OR relation between each
other.
Fig. 8-19
Selection Q-min
The suppression of low-flow volumes is no offset but a limit value as from
which the reading is detected as valid.
NivuSonic CO - Rev. 00 as of 08.12.2010
Page 57
Summary of Contents for NivuSonic Clamp On
Page 109: ...18 Declaration of Conformity...
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