Siemens SITRANS P Instruções de Operação descarregar pdf (Página 113)

The basic measured values, namely pressure and temperatures, have the BAD status in the

following cases:

●

The analog-to-digital converter does not function.

● Linearization values in the EEPROM are defective.

● If the two end points of the customized characteristic curve are exceeded for the status of

the device variables of the following function.

UNCERTAIN status

If a pressure value exceeds or falls below the sensor limits of the device by more than 20%,

the corresponding measured value and the variables inferred from it are UNCERTAIN.

If the analog-to-digital converter for pressure control is over/underrange, the status is

UNCERTAIN.

HIGH LIMIT and LOW LIMIT

If the analog-to-digital converter is overrange, the HIGH LIMIT label is allocated. If the analog-

to-digital converter is underrange, the LOW LIMIT label is allocated.

Change in status

If the status of a device variable changes and it was right at the front of the sequence of

operations for a block, e.g. pressure, then all variables that are derived from it will take on the

same status. In the following example, the device variable "Pressure" has the BAD status.

Since the measuring mode selector is set to "USER", the device variable "User" is also given

the BAD status.

The reasons for changes in the status of a device variable are summarized in the table. If there

were several reasons for a change in status, MANUAL always has the highest priority. BAD

has the second highest and UNCERTAIN the third highest priority.

Operating functions through HART

7.3 Selecting the measuring modes

SITRANS P, DS III series with HART

Operating Instructions, 09/2012, A5E00047092-08 111

1 2 ... 108 109 110 111 112 113 114 115 116 117 118 ... 233 234

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Siemens SITRANS P Instruções de Operação Página 113