Instruction Manual
NivuFlow 650
page 94
NF 650 - rev. 01 / 29.06.2020
The overlap is indicated on the screen by offset colour bars next to the channel (Fig. 32-11).
Fig. 32-11 Overlapping: Selection and display
32.3.3 Deviation (abs.)
The >Deviation (abs.)< parameter is indicated/selectable only if at least two level sensors are
connected and overlap is activated.
Here define a value lower than the shared/overlapping measuring section. The >Deviation
(abs.)< is either added to or subtracted from the median *
1
to a valid range for the individual
measurements.
Should the values of one or more sensors be out of the valid range the individual measure-
ments are not valid and will not be considered by the transmitter. Moreover, an error message
is generated and saved in the error memory.
The transmitter continues to measure and checks the results for validity. As soon as there are
measurements available again within this range the results will be included with the calcula-
tions and the error message will be no longer active.
*
1
Determination of the Median:
The measurement values of the sensors determined within the overlapping measurement
areas are compared and a so-called median is defined:
• for two sensors this is the mean value of both measurement values (= mean of mea-
surement values), i.e.
Sensor 1: 0.9 m
Sensor 2: 1.0 m
giving a median of 0.95 m
• for three sensors the measurement value of the sensor in between (= middle measu-
rement value), i.e.
Example I:
Sensor 1: 0.9 m
Sensor 2: 1.0 m
Sensor 3: 0.92 m
giving a median of 0.92 m (value of the sensor in between)
Example II:
Sensor 1: 0.9 m
Sensor 2: 1.0 m
Sensor 3: 1.0 m
giving a median of 1.0 m (value of the sensor in between)
