Nivus NivuFlow 750, Instruction Manual

Page: 75 / 162

Parameter Setting
NFM 750 - rev. 03 / 27.05.2020 page 75
Free symmetric height-area profile (Height-Area)
Some hydraulic tables may contain height-area value pairs instead of height-width to specify
symmetric channels. In such cases enter the value pairs into the selected height-area table.
Necessarily observe here the relevant note above on the viewing direction with free pro-
files on page 73.
The following procedure is the same as with programming height-width profiles. The pro-
grammed profile however cannot be indicated as graph here.
Q/h-Function (Q=f(h))
Fig. 36-5 Q/h-Function
This function significantly varies from the functions described above.
The selection is neither considering the channel profile nor the flow velocity and the commu-
nication with flow velocity sensors which may be connected is disabled . The missing flow
velocity values will not be considered to create possible error diagnostics.
The system exclusively operates a Q/h-function. This means that a defined flow rate depend-
ing on the currently measured level is indicated. This value is entered into a value table de-
pending on the height.
This table can hold a maximum of 32 height-related breakpoints. The transmitter linearises
between individual breakpoints.
36.1.3 Sludge Level
Depending on measurement medium and flow velocity horizontal pipelines may tend to sedi-
mentation on the pipe bottom.
The >Sludge Level< parameter permits to specify a certain sedimentation level within the
pipe. The sedimentation is then considered as non-moving partial area on the channel bottom
with horizontal surface. Prior to computing the flow rate this level height is subtracted from
the wetted hydraulic total area.
36.1.4 3D-View
The 3D-view shows the measurement place featuring all adjusted parameters and the ac-
cording sensors.
36.1.5 Low-Flow Suppression
This parameter is used to suppress lowest movements or apparent flow rates. The main area
of use is the measurement of discharge volumes in permanently filled constructions.

Check >Active<.
Another input mask opens up. Here you can specify which positive values you wish to
suppress e.g. at very low flow rates. It is not possible to enter negative values.