VEGA D90 Profibus PA - Manual (Page 21)

Pressure transmitter D90 (Profibus PA) 21
Setup
ti
1
s
Lin.-
curve
activ
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.
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
current remains on the last value (only after
saving with the "OK" key will the output
current 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
Here, the unit for the measured
value display, as well as for the
display module, can be selected
(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
Unit
0,0
skal
psi
kPa
%
m
ft
inch
mbar