VEGA VEGABAR 21 - Manual (Page 20)

20 VEGABAR 21
Set-up
Adjustment by considering the actual
pressure (life-adjustment)
The life-adjustment comprises two steps:
1 Adjustment of zero
2 Adjustment of span
The appropriate output current is displayed
via the DOT-matrix.
1 Adjustment of zero
(e.g. process pressure zero or vessel
empty)
Set with the “+“ or “–“-key the cur-
rent value to 4,000 mA. Then push
the “OK“-key.
2 Adjustment of span
(e.g. process pressure or vessel level max.)
Set with the “+“ or “–“-key the cur-
rent value to 20,000 mA. Then push
the “OK“-key.
Note:
- A modification of zero does not influence
the adjusted span.
- For standard adjustment of zero/span “+“
and “–“ are pushed simultaneously. The
value jumps directly to 4 mA/20 mA.
- In case of a high turn down generally the
“+“ and “-“-key should be pushed simulta-
neously due to the resolution.
- When pushing the “+“ or “–“-keys individu-
ally, the output current remains at the last
value, only after storing with the “OK“-key it
takes the adjusted value.
- It is also possible to adjust currents for
part fillings or part pressures, e.g. 8 mA for
25 % and 16 mA for 75 %. Then VEGABAR
calculates automatically the current values
for 0 % or 100 % (only possible with
>3,3 %).
Adjustment without considering the
actual pressure (dry adjustment)
The adjustment without pressure comprises
four steps:
1 Enquiry of the unit in which the adjustment
should be carried out
2 Offset correction
3 Adjustment of zero
4 Adjustment of span
The offset correction (only with overpressure)
defines the reference basis for the measure-
ment. It can be carried out:
- before or after the adjustment of zero and
span
- before or after installation of VEGABAR.
VEGABAR must be unpressurised when the
offset correction is carried out!
The adjustment without pressure can be
carried out assembled or unassembled (e.g.
workroom). An actually available pressure
has no meaning for the adjustment.
1 Enquiry of the unit
Choose with the “+“ or “–“-key the
unit. Save the selected unit with the
“OK“-key.
2 Adjustment of zero
Adjust zero with the “+“ or “–“-key
and save with the “OK“-key.
4 Adjustment of span
Adjust span with the “+“ or “–“-key
and save with the “OK“-key.
Zero
4,000
mA
Span
20,000
mA
Zero
0,0
mbar
Span
100,0
mbar
Adjust
without
press.
Unit
0,0
mbar
psi
kPa