Wika D-11-7 Manual do Utilizador descarregar pdf (Página 22)

22 WIKA operating instructions pressure transmitter model D-1x-7

2478159.05 12/2011 GB/D/F/E

Zero adjustment, example 2:

A pressure transmitter with a measuring range of -1 ... +2.5 bar has a zero oset of -10 mbar, then one

would correct:

Pressure range -1 ... +2.5 bar

Span: 3.5 bar

Display value 10 mbar too low

Oset: -0.010 bar

Span correction

Output data Input data Explanation

0x22 XX XX 0x22 HI LO Read span correction

0x24 HI LO 0x24 HI LO Write span correction

The respective correction value can be calculated as follows:

Correction value = -

Span oset

x 50,000

Span

Correction value: Digit value which is programmed into the instrument via service 0x24.

Span oset: Set span - actual span in bar

Span: Set span MBE - MBA in bar

The changes only take eect after a reset.

6. Commissioning, operation

Correction value = -

Oset

x 50,000

Span

Correction value = -

-0.010 bar

x 50,000

3.5 bar



Correction value = +143 0x008F

Output data

0x23 0x00 0x8F

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 111 112

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Wika D-11-7 Manual do Utilizador Página 22