WIKA D-11-7 - Manual (Page 21)

21 WIKA 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 = -
Offset x 50,000
Span
Correction value: Digit value which is programmed into the instrument via service 0x23.
Offset: Deviation of the zero point from the set point in bar
Span: MBE - MBA in bar
Changes only take effect after a reset.
Zero adjustment, example 1:
A pressure transmitter with a measuring range of -1 ... +2.5 bar has a zero offset of +10 mbar, then one
would correct:
Measuring range -1 ... +2.5 bar
Span: 3.5 bar
Display value 10 mbar too high Offset: +0.010 bar
6. Commissioning, operation
Correction value = -143 0xFF71
Correction value = - Offset x 50,000
Span
Correction value = - 0.010 bar x 50,000
3.5 bar

Output data
0x23 0xFF 0x71