VEGA VEGADIF 34 … 51 - Manual (Page 35)

VEGADIF 34 … 51 35
20094-EN-030731
Set-up
Two adjustment methods are available
- adjustment without pressure (dry)
- adjustment with pressure (wet)
The dry adjustment can be carried out in the
workshop before mounting or after mounting
at the measuring site. During adjustment
be-
fore mounting, make sure that the position of
the transmitter corresponds to the intended
installation position. This is particularly neces-
sary for VEGADIF 45 and 51 with isolating
system or capillaries. For sensors without
display you should use a precision ammeter
(class 0.03 or better) to adjust the current
output.
Adjustment without pressure (dry)
Reduce zero
1 Push the z– key twice and hold it pushed.
2 Note the current change.
3 Release the z- key when the requested
current value is reached.
4 The display resets automatically to operat-
ing mode after approx. 2 s and the adjusted
value is saved.
Example:
given: 0 … 1000 mbar, (z = 0 mbar, s = 1000
mbar)
z to be changed to: z = -500 mbar
Increase zero
Push the z+ key twice and hold it pushed. The
procedure is the same as for reduce zero.
Reduce span
1 Push the s– key twice and hold it pushed.
2 Note the current change.
3 Release the s- key when the requested
value is reached.
4 The display resets automatically to operat-
ing mode after approx. 2 s and the adjusted
value is saved.
Example:
given: 0 … 1000 mbar, (z = 0 mbar, s = 1000
mbar)
to be changed to: s = 500 mbar
Push the s- key and hold it pushed until
500 mbar are adjusted.
Adjustment range (editing limits) of zero and
span:
-110 … +110 % of the nominal range
Adjustment with pressure (wet)
When adjusting with pressure, VEGADIF must
be connected to a variable pressure source.
These are the options:
- connect to a pressure calibrator
- connect directly to the process
Adjust zero with display
1) Set pressure for zero precisely (e.g.
0 bar) and check via the display.
2) Push the z+ and z– keys simultaneously.
The pressure (e.g. 0 bar) corresponds to the
output current 4 mA.
Adjust span with display
1) Set pressure for span precisely (e.g.
1 bar) and check via the display.
2) Push the s+ and s– keys simultaneously.
The pressure (e.g. 1 bar) corresponds to the
output current 20 mA.
Adjust zero without display
1) Set pressure for zero precisely (e.g.
0 bar) and check via an external pressure
calibrator.
2) Push the z+ and z– keys simultaneously.
The pressure (e.g. 0 bar) corresponds to the
output current 4 mA.