Labom PASCAL CV4 Operating Instructions Manual page 14

6.4.3 Menue "Adjustment"
The following functions are available for the pressure adjustment:
Menue entry
Zero point
Position correct.
Lower adjust.
Upper adjust.
Additionally, you can perform a current adjustment (see 6.4.3.4).
6.4.3.1 Zero-point correction
The zero-point correction requires a non-pressurized pressure port e.g. during calibration
in the lab. When executing this function the applied pressure will be interpreted as zero bar
relative pressure.
The zero point correction results in an offset of the whole characteristic curve. Therefore it
is a special case of the lower adjustment (see below).
6.4.3.2 Position correction
Using the function "Position correction", you can correct the offset error due to the installa-
tion position independent of the zero-point offset.
In the corresponding submenue, you will find the following entries:
Menue entry
Pos.corr. on/off
Pos.corr. adjust.
When you set the position correction, it will be activated automatically. You can deactivate
the position correction, for instance for a subsequent calibration to check the zero point
independently from the installation position.
6.4.3.3 Upper and lower adjustment
The lower adjustment results in an offset of the characteristic curve. It thus affects zero
and span of the measuring range.
The upper adjustment changes the slope of the characteristic curve by correcting the span
of the measuring range.
Execute the lower adjustment prior to the upper adjustment for a correct full adjustment.
BA_080 Rev 1J8 Pressure transmitter PASCAL CV4
Description
Set device at ambient pressure to zero (0 bar rel)
(not with absolute pressure devices)
Correct zero point error due to installation position
(not with absolute pressure devices)
Offset correction with applied reference pressure
Span correction with applied reference pressure
Table 8: "Pressure Adjustment" menue
Description
Activate/deactivate position correction
Correct position error at ambient pressure
Table 9: "Position Correction" submenue
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