Nivus osm-f, Operation Instruction Manual

Page: 50 / 103

Instruction Manual
OCM F
Page 50 OCM F - Rev. 04 as of 18.02.2014
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In order to define the zero point of the channel start by entering 0 – 0 in break-
point 1. All further breakpoint can be set freely regarding height as well as
width/area.
There may be different distances between individual level points. Furthermore it
is not required to use all of the 32 breakpoints possible. The OCM F however is
going to use a linearization function between the breakpoints. Decrease the dis-
tance between breakpoints in case of heavy and irregular fluctuation within the
area.
Fig. 9-23 breakpoints for >Custom shape<
Sludge level The sludge level set is going to be calculated as non-moving channel sub-area
and will be subtracted from the wetted hydraulic total area prior to performing
flow calculation.
Low-flow volume
Q
min.
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 ab-
solute 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 Qmin.
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 con-
sidered 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.