VEGA VEGAWELL 72 4 … 20 mA_HART - Manual (Page 24)

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.
Information:
T
he corresponding current values must be calculated and set
respectively for adjustment with part fillings or emptyings.
E
xample: For a part emptying of 25 %, a current of 4 mA +
4 mA = 8 mA must be set, for a part filling of 75 %, a current of
4 mA + 12 mA = 16 mA. VEGAWELL 72 then calculates the
values for full and empty.
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 M
ake sure that the integration time is set to 0 sec by
pressing the [-] key 10 times.
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
Adjustment steps, inte-
gration time
Adjustment steps, scal-
ing
24 VEGAWELL 72 • 4 … 20 mA/HART
6 S et up
27630
-EN
-080806