Instruction Manual
NivuFlow 650
page 90
NF 650 - rev. 01 / 29.06.2020
32.1.14 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.
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Check >Active< and enter the desired value in >Q suppressed< or >v suppressed<.
Fig. 32-8
Low-Flow Suppression
The low-flow suppression disregards the detection of very low flow velocity fluctuations.
•
>Q suppressed<<
Enter the flow rate as a positive value.
Negative values are not possible. The specified value is considered as absolute value
and is effective in both positive and negative directions. The measurement system
will automatically reset the readings to “0” if the values should be lower than the value
specified here.
Default setting
: 0.000 l/s
• >v suppressed<
This parameter permits to suppress apparent flow rates in applications featuring large
profiles and high levels. Very low velocity fluctuations may cause heavy apparent flow
rate fluctuations over a long period which cannot be suppressed using the >Q sup-
pressed< function. The measurement system will automatically reset the readings to
“0” should the flow velocities be lower than the value specified here. This will also set
the calculated volume to “0”.
Only positive values can be entered here. The specified value is considered as abso-
lute value and is effective for both positive as well as for negative velocities.
Default setting
: 0.000 m/s
•
>h suppressed<
Enter low limit values for levels here. If the real levels are lower than the value ente-
red here, the system will set the measurement values automatically to “0”. No areas
are calculated in such cases and flow rate calculations cannot be carried out.
Default setting
: 0.000 m
32.1.15 Damping
This menu enables to adjust the display and analog output damping in seconds.
Damping relates to
all
values which are available as input. It is not possible to select individual
values and to damp single values in different ways.
Taking the specified period, all readings are saved and a floating average is created for each
individual average value. This average is used for further calculation of the flow rate.
