Wika D-11-7 Manual do Utilizador descarregar pdf (Página 21)

21WIKA operating instructions pressure transmitter model D-1x-7

2478159.05 12/2011 GB/D/F/E

GB

Zero adjustment

Output data Input data Explanation

0x21 XX XX 0x21 HI LO Read zero adjustment

0x23 HI LO 0x23 HI LO Write zero adjustment

The respective correction value can be calculated as follows:

Correction value = -

Oset

x 50,000

Span

Correction value: Digit value which is programmed into the instrument via service 0x23.

Oset: Deviation of the zero point from the set point in bar

Span: MBE - MBA in bar

Changes only take eect after a reset.

Zero adjustment, example 1:

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

would correct:

Measuring range -1 ... +2.5 bar

Span: 3.5 bar

Display value 10 mbar too high

Oset: +0.010 bar

6. Commissioning, operation

Correction value = -143 0xFF71

Correction value = -

Oset

x 50,000

Span

Correction value = -

0.010 bar

x 50,000

3.5 bar



Output data

0x23 0xFF 0x71

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 111 112

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