Siemens SITRANS P Instruções de Operação descarregar pdf (Página 86)

Explanations for the blind adjusting example

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.

In this example you create no pressure.

B Use the [M] button to switch the transmitter to mode 5. To adjust the start of scale value

to 2 bar, press one of the [↑] or [↓] buttons.

If there is 2 bar input pressure, the transmitter produces an output current of 4 mA.

C Use the [M] button to switch the transmitter to mode 6. To adjust the full scale value to

14 bar, press one of the [↑] or [↓] buttons.

If there is 14 bar input pressure, the transmitter produces an output current of 20 mA.

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.

Setting without reference pressure

Blind

setting resets the start of scale value to the lower sensor limit and the full scale value to

the upper sensor limit.

Note

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.

6.5.5.2 Blind setting of start of scale value

Introduction

Blind setting resets the start of scale value to the lower sensor limit.

Note

Changes in modes 5 and 6 have an exclusive effect on pressure scaling. This does not affect

the scaling for level or customized characteristic curve. Therefore, only measured pressure

values and pressure units are displayed in these modes.

Operation

6.5 Local operation

SITRANS P, DS III series with HART

84 Operating Instructions, 09/2012, A5E00047092-08

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Siemens SITRANS P Instruções de Operação Página 86