Siemens SITRANS P DS III Operating Instructions Manual page 81

A The measuring range is from 0 to 16 bar. You are changing the start of scale value from
B 2 bar process pressure is created.
C 14 bar process pressure is created.
D The output current can be calculated for any input pressure using the "current calculation
Note
If the value exceeds or falls below the preset measuring limits by more than 20% when
setting, the setting function is not carried out. The old value is retained in this case.
With a marked elevation of the zero point, the full scale value must therefore previously be
reduced such that it still lies within the permitted range after elevation of the zero point. This
setting function is only possible in "Pressure" measuring mode.
Adjusting with reference pressure
Requirement:
The reference pressure, the adjusted start of scale value and adjusted full scale value are
known.
When adjusting, a start of scale value or a full scale value can be allocated to a desired
current value with the aid of a reference pressure. This function is particularly suitable when
the required pressures for the start of scale value and the full scale value are not available.
After adjustment, the measuring range specified on the nameplate may no longer
correspond to the setting made.
Using the formulae below, the current to be set for the desired start of scale value and the
full scale value can be calculated.
To calculate the output currents when setting the start of scale value or the full scale value,
the reference pressure must be selected such that a value between 4 and 20 mA results for
the current.
SITRANS P DS III with HART
Operating Instructions, 06/2013, A5E00047092-09
0 to 2 bar and the full scale value from 16 to 14 bar. The measuring span is then 12 bar.
Use the [M] button to set the transmitter to mode 2. To set the start of scale value, press
the [↑] and [↓] buttons simultaneously for 2 seconds.
If there is 2 bar input pressure, the transmitter produces an output current of 4 mA.
Use the [M] button to set the transmitter to mode 3. To set the full scale value, press the
[↑] and [↓] buttons simultaneously for 2 seconds.
If there is 14 bar input pressure, the transmitter produces an output current of 20 mA.
formula for setting".
Operation
6.5 Local operation
81