VEGA D95 Profibus PA - Manual (Page 20)

20 Pressure transmitter D95 (Profibus PA)
Adjustment
(only possible if "%" or "Lin%" has been cho-
sen for the PA output)
Adjustment taking the current pres-
sure into account (live adjustment)
Live adjustment comprises two steps:
1 Adjustment of zero
2 Adjustment of span
1 Adjustment of zero
(e.g. process pressure zero or vessel
empty)
Set the percentage value to 0.0 %
with the "+" or "–" key. Then push the
"OK" key.
2 Adjustment of span
(e.g. process pressure zero or vessel level
max.)
Set the percentage value to 100 %
with the "+" or "–" key. Then push the
"OK" key.
Note:
- A modification of zero does not influence
the adjusted span, i.e. the final value of the
measuring range is shifted.
- Push the "+" and "-" key simultaneously for
standard adjustment of zero/span. The
value jumps directly to 0 %/100 %.
- When pushing the "+" or "–" keys individu-
ally, the output signal remains at the last
value; it takes on the adjusted value only
after saving with the "OK" key.
- It is also possible to set values for partial
fillings or partial pressures, e.g. 25 % and
75 %. The pressure transmitter then auto-
matically calculates the values for 0 % or
100 % (only possible with a level difference
>3.3 %).
Zero
0,0
%
Span
100
%
Setup
Adjust PA output
The PA output is factory-set to "Lin%". With
this adjustment it is possible to carry out an
adjustment and a volume measurement ( to
measure the volume of a non-linear vessel,
the linearisation curve of the vessel also has
to be programmed into the D95 with the soft-
ware VVO). The adjustment "%" enables a
level measurement (also with adjustment). If
only a pressure value should be outputted,
the PA output must be set to "Pressure". An
adjustment is then not possible. Move with
the arrow and "OK" key to the menu item "PA
output", choose there the requested option
with the "+" or "–" key and save with the "OK"
key.
Under "Scaling out." you can modify the
number values (min/max), the position of the
decimal point and the unit (with the "+" or "–"
key the values can be modified, with the "OK"
key the adjustments are saved).
Adjust-
ment
Calcu-
lation
Operate
0,0
skal
Output
Scaling
out.
100
%=
1000
Decimal
point
888,8
0
%=
0
Escape
PA-
output
Lin%
pres-
sure
%
Unit
0,0
%
Escape
mbar
psi
kPa
m
ft
inch
inHg