Siemens SITRANS P Instrucciones de operaciones descargar pdf (Pagina 105)

In the device, the characteristic curve vertices are only provided once in the EEPROM.

Therefore,

if the measuring mode is changed, you will usually need to adjust the characteristic

curve accordingly.

The characteristic curve function expects at least two and at the most 30 characteristic curve

vertices as input parameters. Characteristic curve vertices are entered in pairs of values

x %;y %. The values for the x-coordinate are only accepted by the device when they run

monotonically. The y-coordinates, on the other hand, may also be non-monotonic. A warning

will however be issued by the configuring device, which you as the user have to recognize and

acknowledge. The output of the characteristic curve is not explicitly stored in a device variable,

but rather is directly interconnected with the input of the next function block in each case. The

pairs of values 0%;0% and 100%;100% are set as default values. In principle, rising and falling

characteristic curves can be configured. With regard to the device variable status, rising

characteristic curves are however preferred. Otherwise the meanings of HIGH LIMIT and LOW

LIMIT are swapped.

See also

Measured value status (Page 110)

7.3.6 Measuring mode "Level"

Description

Once you have configured the measuring mode "Level", the device variables "Level", "Volume"

and "Mass" are activated. They are all inferred from the measured pressure. The "Level" block

here represents a series of permanently interconnected functions which you need to configure

Operating functions through HART

7.3 Selecting the measuring modes

SITRANS P, DS III series with HART

Operating Instructions, 09/2012, A5E00047092-08 103

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Siemens SITRANS P Instrucciones de operaciones Pagina 105