Endress+Hauser Deltabar S FMD 77, Brief Operating Instructions

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Commissioning Deltabar S PROFIBUS PA
30 Hauser
7.2 Position adjustment
Due to the orientation of the device, there may be a shift in the measured value, i.e. when the
container is empty, the measured value parameter does not display zero. There are three options
to choose from when performing position adjustment.
(Menu path: GROUP SELECTION

OPERATING MENU

SETTINGS

POSITION
ADJUSTMENT)
Parameter name Description
POS. ZERO ADJUST (685)
Entry
Position adjustment – the pressure difference between zero (set point) and the measured
pressure need not be known. (A reference pressure is present at the device.)
Example:
– MEASURED VALUE = 2.2 mbar
– Correct the MEASURED VALUE via the POS. ZERO ADJUST parameter with the "Confirm"
option. This means that you are assigning the value 0.0 to the pressure present.
– MEASURED VALUE (after pos. zero adjust) = 0.0 mbar
The CALIB. OFFSET parameter displays the resulting pressure difference (offset) by which
the MEASURED VALUE was corrected.
Factory setting:
0
POS. INPUT VALUE (563)
Entry
Position adjustment – the pressure difference between zero (set point) and the measured
pressure need not be known. (A reference pressure is present at the device.)
Example:
– MEASURED VALUE = 0.5 mbar
– For the POS. INPUT VALUE parameter, specify the desired set point for the MEASURED
VALUE, e.g. 2 mbar.
(MEASURED VALUE
new
= POS. INPUT VALUE)
– MEASURED VALUE (after entry for POS. INPUT VALUE) = 2.0 mbar
– The CALIB. OFFSET parameter displays the resulting pressure difference (offset) by
which the MEASURED VALUE was corrected.
CALIB. OFFSET = MEASURED VALUE
old
– POS. INPUT VALUE,
here: CALIB. OFFSET = 0.5 mbar – 2.0 mbar = – 1.5 mbar)
Factory setting:
0
CALIB. OFFSET (319)
Entry
Position adjustment – the pressure difference between zero (set point) and the measured
pressure is known.
Example:
– MEASURED VALUE = 2.2 mbar
– Via the CALIB. OFFSET parameter, enter the value by which the MEASURED VALUE
should be corrected. To correct the MEASURED VALUE to 0.0 mbar, you must enter the
value 2.2 here.
(MEASURED VALUE
new
= MEASURED VALUE
old
– CALIB. OFFSET)
– MEASURED VALUE (after entry for calib. offset) = 0.0 mbar
Factory setting:
0