VEGA D91 Profibus PA - Manual (Page 23)

Pressure transmitter D91 (Profibus PA) 23
Setup
ti
1
s
Adjustment without taking the current
pressure into account (dry adjustment)
Adjustment without pressure comprises four
steps:
1 Selection of the unit in which the adjustment
is to be carried out
2 Offset correction
3 Adjustment of zero
4 Adjustment of span
The offset correction (only in gauge pressure
mode) defines the reference positions for the
measurement. It can be carried out:
- before or after adjustment of zero and
span
- before or after installation of transmitters.
The transmitter must be unpressurised for
the offset correction!
Adjustment without pressure can be carried
out with the instrument mounted or dis-
mounted (e.g. workroom). Any ambient pres-
sure has no effect on the adjustment.
1 Selection of the unit
Choose the unit with the "+" or "–"
key. Save the selected unit with
the "OK" key.
2 Adjustment of zero
Adjust zero with the "+" or "–" key
and save with the "OK" key. Zero
0,0
mbar
Span
100,0
mbar
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 span.
- By pushing the "+" and "–" keys, the output
remains on the last value - only after saving
with the "OK" key will the output take on the
adjusted value.
Evaluation
Linearisation curve
Is only displayed if a linearisation
curve has been activated with VVO.
Adjustment of the integration time
An integration time t
i
of 0 s … 50 s
can be adjusted with the "+" or "–"
key for damping of pressure
shocks. The adjusted value can be saved
with the "OK" key.
Selection of the indicated unit
The measurement unit for the meas-
ured value display as well as for
the display module can be selected
here (with the "+" or "–" key and the
"OK" key). If you select "scal.", the
scaled PA output value will be dis-
played (as adjusted under "Scaling
outp.").
Adjust
without
pres.
Unit
0,0
mbar
psi
kPa
inHg
Lin.-
curve
activ
Unit
0,0
skal
psi
kPa
%
m
ft
inch
mbar