VEGA VEGABAR 44 4 … 20 mA - Manual (Page 21)

VEGABAR 44 (4 … 20 mA) 21
Setup
3 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.
Note:
- A modification of zero does not influence
the adjusted span, i.e. final value of the
measuring range will simply be shifted.
- By pushing the "+“ or "–“ keys individually,
the current output remains at the last value,
it takes on the adjusted value only after
storing with the "OK“ key.
Evaluation
Adjustment of the integration time
An integration time t
i
of 0 s … 10 s
can be adjusted with the "+“ or "–“
key. The adjusted value can be
saved with the "OK“ key.
Selection of the indicated unit
The actual measured pressure is
indicated in the DOT-matrix in the
measured value indication. The
respective unit can be chosen with
the "+“ or "–“ key and the "OK“ key
from a list. When choosing the unit
"Scal.“, the following menu items are
available.
Scaling indication
In operating condition, the actual measured
pressure is displayed on the indicating mod-
ule:
- as bar graph with 20 segments
- as 4-digit digital value.
ti
1
s
Zero
0,0
mbar
Span
100,0
mbar
Bar graph and digital value relate to the ad-
justed measuring range and change in
proportion to the current output. Digital
values < –10 % or > 110 % are shown as
flashing figures.
As a result of scaling, the 4 mA or 20 mA
user-specific current output values are
passed to the indicating module as 4-digit
digital values.
Outputs
Current output/Selection of the character-
istics
The current output provides the
actual measured pressure as an
analogue current signal 4 … 20 mA
relating to the adjustment.
The characteristics can also be inverted, e.g.
switched to 20 … 4 mA with the "+“ or "–“ key
and the "OK“ key.
Fault signal
If, during the continuous self-monitoring,
errors, damage or malfunctions in the
measuring cell or the electronics are
detected, a fault signal is triggered via the
current output.
With "+“ or "–“ key and the "OK“
key you can choose if the failure
current should be 22 mA or
3.6 mA.
Unit
0.0
mbar
psi
kPa
%
Scal.
mA
Scaling
indica-
tion
100%=
1000
Decimal
point
888.8
0%=
0 Escape
Current
output
4-20mA
20-4mA
Fault
signal
22mA
3.6mA