VEGA VEGABAR 74 4 … 20 mA_HART - Manual (Page 19)

4 E
mpty the vessel or reduce process pressure
5 S
et a current of 4 mA with the [+] and [-] keys
6 M
eas. range end: Set rotary switch to "span"
7 F ill the vessel or increase process pressure
8 S et a current of 20 mA with the [+] and [-] keys
9 O peration: Set rotary switch to "OPERATE"
10 C lose housing cover
T
he adjustment data are effective, the output current 4 … 20 mA
corresponds to the actual level.
P
roceed as follows for the adjustment of the integration time
with VEGADIS 12:
1 O pen housing cover
2 S et rotary switch to "ti"
3 B y pushing the [-] key 10-times, make sure that the
integration time is set to 0 sec.
4 F
or every 1 sec. requested integration time, push the [+]
key once.
5 T
he integration time is the time required by the output
current signal to reach 90 % of the actual height after a
sudden level change.
6 S
et rotary switch to "OPERATE"
7 C lose housing cover
T
he display outputs the current 4 … 20 mA as bar graph and
digital value.
W ith 4 mA no segment of the bar graph appears, with 20 mA
all segments appear. This assignment is fix.
Y ou can scale the digital value to any value between -9999 …
+ 9999 via the adjustment module.
P
roceed as follows for scaling the indication of VEGADIS 12:
1 O pen housing cover
2 I nitial value: Set rotary switch to "zero"
3 S
et the requested value, e.g. 0 with the [+] and [-] keys
4 F
inal value: Set the rotary switch to "span"
5 S
et the requested value, e.g. 1000 with the [+] and [-] keys
6 D ecimal point: Set the rotary switch to "point"
7 W ith the [+] and [-] keys you can adjust the requested
value, e.g. 8888 (no decimal point)
Adjustment steps, integration
time
Adjustment steps, scaling
VEGABAR 74 - 4 … 20 mA/HART 19
S et up
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