Siemens Sitrans P500 Operating Instructions Manual page 152
Pressure transmitter
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6.3 Description of the operating functions
Figure 6-12
Example
The "Input scaling, pressure" function defines the pressure range of 0 to 2 bar that is
interpreted as 0 and 100% by the following square root extracting function. In the following
diagram, a process pressure of 0.5 bar is assumed.
In the "mass flow" measuring mode, a square root extraction characteristic "srlin2" with a
root application point of 10 % is applied as standard.
In the calculation example the input value for the "root extraction function" is about 25 % for
a prevailing process pressure of 0.5 bar. The output value is about 50 %.
MA
Start of scale value
ME
Full scale value
Figure 6-13
Calculation of the mass flow
In the calculation example, the two value pairs 0 %;0 % and 100 %;50 % are assigned as
parameters to the correction characteristic. This setting corresponds a halving of the input
value for all output values.
152
"Mass flow" measurement type
p
MF
Pressure
Mass flow
Operating Instructions, 12/2014, A5E02344528-09
SITRANS P500 with HART
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