VEGA VEGADIF 34 … 51 - Manual (Page 37)

VEGADIF 34 … 51 37
20094-EN-030731
Set-up
Display bias pressure
1) Push the z+ and s+ keys once simultane-
ously.
2) The adjusted bias pressure is displayed.
3) The display resets automatically to operat-
ing mode after approx. 2 s.
Save/accept bias pressure
1) Push the z+ and s+ keys twice simultane-
ously. The available pressure value is
accepted as bias value.
2) The display resets automatically to operat-
ing mode after approx. 2 s and displays
0.000 bar. The acting pressure (0 bar)
was thus accepted as bias pressure
(correction value).
Delete bias pressure
1) Push the z– and s– keys simultaneously
twice.
2) The display resets automatically to operat-
ing mode after approx. 2 s and displays
the value of the uncorrected bias pres-
sure.
Lock/unlock keys
Lock
1) Push the z+ and s– keys simultaneously
twice.
2) „Prot“ = protected appears.
3) The display resets automatically to operat-
ing mode after approx. 2 s.
Unlock
1) Push the z– and s+ keys simultaneously
once.
2) „Free“ = unlocked appears.
3) The display resets automatically to operat-
ing mode after approx. 2 s.
Integration time and output characteris-
tics
An integration time of 0, 1, 2, 4, 8, 16 s can be
adjusted via the step switch on your VEGADIF
to smooth the output signal. The output char-
acteristics for pressure, level and flow can be
selected as linear or extracted by root.
The integration time is the time required by the
output to reach 63 % of the actual height after
a signal jump of the differential pressure. After
three times the adjusted integration time, the
current output signal has reached 95 % of the
step change.
Explanation:
- an integration time of 0 s means tracking of
the current output without additional delay.
- an integration time of 16 s means that the
output will reach its final value only after
more than one minute.
Adjust the integration time and the output
characteristics acc. to the chart. The figures
indicate the switch positions:
Characteristics linear extracted by root
I ~
∆
p I ~
√∆
p/
∆
p
max.
Integration time
0 s 1 9
0.5 s 2 A
1 s 3 B
2 s 4 C
4 s 5 D
8 s 6 E
16 s 7 F
Positions 0 and 8 allow the adjustment with the
PC (VVO) or the HART
® handheld by which
you can also adjust the integration time of
0 … 40 s.
∆
p
∆
p
I I