Siemens SITRANS P DS III Operating Instructions Manual page 97

Fixed application point
The "srli2" function has a permanently defined application point of 10%. The range up to this
point contains two linear characteristic curve sections. The first section ranges from the zero
point to 0.6% of the output value and 0.6% of the pressure value. The second section has a
higher gradient and it goes up to the root application point at 10% of the output value and 1%
of the pressure value. See the following figure for this purpose.
Procedure
Proceed as follows to set or adjust the type of characteristic curve:
1. Set mode 11.
2. Select the type of characteristic curve.
3. Save with the [M] button.
Proceed as follows to set or adjust the root application point: This procedure is not applicable
for "srli2":
1. Set mode 12.
2. Select an application point between 5 and 15%.
3. Save with the [M] button.
SITRANS P DS III with HART
Operating Instructions, 06/2013, A5E00047092-09
To set the characteristic curve to "linear", press the [↑] and [↓] buttons simultaneously.
To set the application point to 10%, press the [↑] and [↓] buttons simultaneously.
Note
Mode 12 cannot be selected if the "linear" or "srli2" measuring mode has been adjusted in
mode 11.
If the square root extracting characteristic curve has been adjusted in mode 11 and if the
measured value display has been set to "Pressure" in mode 13, the root sign and the
differential pressure corresponding to the flow rate are displayed.
The root extraction function "srli2" is set in "flow rate" measuring mode. You therefore set
the "characteristic curve" parameter in SIMATIC PDM to "linear".
Operation
6.5 Local operation
97