Siemens SITRANS P DS III Operating Instructions Manual page 99

Functional principle
The raw pressure value first passes through a calibration. The resulting cleaned-up pressure
value is checked for sensor limits. Any violation of the limits results in status "Bad" and a
diagnostic error of "error collecting measured value". The cleaned-up pressure value is
stored in SEC 1.
Then, it is subjected to a normalization, where the input signal is expressed in the range 0 to
10 (percentage/100). The normalized pressure value is stored in SEC 2.
Afterwards, depending on the measurement task, it is fed through one of four different
linearization types. Scaling uses the preset working range (minimum and maximum values)
to determine the normalized and linearized measured value (pressure, height, or volume) of
the actual process variable. This is stored in PRIM.
By means of a multiplication with the density the volume is used to compute the mass. This
is stored in SEC 3.
The temperature value of the pressure sensor is available in the "temperature" parameter.
See also
Acyclic data transfer (Page 170)
SITRANS P DS III/P410 with PROFIBUS PA
Operating Instructions, 02/2016, A5E00053276-08
Operator control functions via PROFIBUS
7.1 Communications structure for PROFIBUS PA
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