6.1 Determining the fill level
The module chain described in the following is started and executed once every time a recording is to be
carried out. The record interval can be selected via the "Record interval" parameter (see "Basic settings" on
page 92). The triggers can, however, be used to switch to an alternative record interval that can be selected
via the "Record interval alternative" parameter (see "Basic settings" on page 92).
Diagram of how the "Sensor 1" and "Sensor 2" measurement values are generated (see
"Measurement channels" on page
1
Generation of the raw value, which is the relative
pressure (see "Determining the raw value
(relative pressure)" on page 38)
4
Adds the value entered via the "Trimming"
configuration parameter to the fill level that is
corrected by the "Sensor Offset" (see "Taking the
trimming into consideration" on page 39)
2
Conversion of the raw value (relative pressure) to
the fill level (see "Calculating the fill level" on page
38)
5
Monitoring of the alarm limits and trigger levels
(see "Alarm/trigger module" on page 39)
3
Adds the value entered via the "Sensor Offset"
configuration parameter to the fill level (see
"Taking the installation height into consideration"
on page 38)
6
Recording of the measurement values (see
"Record module" on page 39)
6.1.1 Determining the raw value (relative pressure)
The raw value is the relative pressure read directly from the pressure sensor. In the range of 0...50°C , the
pressure sensor controller automatically compensates the temperature-related influences.
6.1.2 Calculating the fill level
The raw value (relative pressure) determined in the previous step is converted to a fill level by multiplying it
with a factor (e.g. 0.0101974 for fresh, waste and grey water) that is dependent on the density of the medium
being measured.
6.1.3 Taking the installation height into consideration
The installation height of the pressure sensor can be taken into consideration in this step. The "Sensor Offset"
configuration parameter is added to the fill level determined during the previous step. This means that a
negative prefix must be set for the "Sensor Offset" parameter if the pressure sensor is installed in a pump
sump and is thus below the zero level, for example.
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