Siemens SITRANS P Betriebsanleitung Seite 80

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Seitenansicht 79
Example of adjusting with reference pressure
A Initial situation
S
UHI
0$
DFWXDOYDOXH
0$
VHWSRLQWYDOXH

0$
DFWXDOYDOXH
0$
VHWSRLQWYDOXH
0(
VHWSRLQWYDOXH
S>EDU@
,>P$@
S>EDU@
,>P$@
S>EDU@
,>P$@
6HWWLQJ
6HWWLQJ
0(
DFWXDO
YDOXH
 
 

 
  
 
B Calculating start of scale value
C Calculating full scale value
Explanations for the example of adjusting with reference pressure
A The measuring range is from 0 to 16 bar. You are changing the start of scale value from 0
to 2 bar and the full scale value from 16 to 14 bar. The measuring span is then 12 bar.
A reference pressure of 11 bar is created.
B Use the [M] button to set the transmitter to mode 2.
The "Current calculation formula for adjusting with reference pressure" can be used to
calculate
the current to be adjusted for the desired start of scale value I
MA
(13 mA at 2 bar)
with the existing reference pressure. It can be adjusted with the [↑] or [↓] buttons I
MA
.
C Use the [M] button to set the transmitter to mode 3.
The "Current calculation formula for adjusting" can be used to calculate the current to be
adjusted for the desired full scale value I
ME
(16 mA at 14 bar) with the existing reference
pressure. It can be adjusted with the [↑] or [↓] buttons I
M
.
Note
If the preset measuring limits are exceeded or fallen below by more than 20% during
adjustment, the resulting current cannot be set above these limits.
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.
See also
Unit (Page 95
)
Operation
6.5 Local operation
SITRANS P, DS III series with HART
78 Operating Instructions, 09/2012, A5E00047092-08
Seitenansicht 79
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