Cerabar S/Deltabar S/Deltapilot S FOUNDATION Fieldbus Parameter description (Local operation and FieldCare)
Endress+Hauser 137
POS. ZERO ADJUST (685)
Entry
Position adjustment – the pressure difference between zero (set point) and the measured
pressure need not be known.
Due to the orientation of the device, there may be a shift in the measured value, i.e. for
example, when the container is empty, the MEASURED VALUE parameter does not
display zero.
Example:
– MEASURED VALUE = 2.2 mbar (0.033 psi)
– 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.
Prerequisite:
• This parameter is displayed for Deltabar S, Cerabar S with gauge pressure sensors or
Deltapilot S.
Options:
• Abort
•Confirm
Factory setting:
0.0
POS. INPUT VALUE (563)
Entry
Position adjustment – the pressure difference between zero (set point) and the measured
pressure need not be known. To correct the pressure difference, you need a reference
measurement value (e.g. from a reference device).
Due to the orientation of the device, there may be a shift in the measured value, i.e. for
example, when the container is empty, the MEASURED VALUE parameter does not
display zero or the desired value.
Example:
– MEASURED VALUE = 0.5 mbar (0.0075 psi)
– For the POS. INPUT VALUE parameter, specify the desired set point for the
MEASURED VALUE, e.g. 2 mbar.
(The following applies: 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.
The following applies: CALIB. OFFSET = MEASURED VALUE
old
– POS. INPUT
VALUE,
here: CALIB. OFFSET = 0.5 mbar (0.0075 psi) – 2.0 mbar (0.03 psi) = – 1.5 mbar (-
0.0225 psi))
Prerequisite:
• This parameter is displayed for Cerabar S with absolute pressure sensors.
Factory setting:
0.0
DAMPING VALUE (274)
Entry
Enter damping time (time constant τ).
The damping affects the speed at which all subsequent elements, such as the local
operation, measured value and OUT value of the Analog Input Block react to a change in
the pressure.
Input range:
0.0 to 999.0 s
Factory setting:
2.0 s or as per order specifications
Table 3: QUICK SETUP "Pressure"
Parameter name Description
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