VEGA VEGADIF 55 4 … 20 mA_HART - Manual (Page 61)

Proceed as follows to prepare for the actual adjustment:
1 C lose valve 3
2 F ill measuring system with medium
O pen valves A, B, 2, 4: Medium flows in
3 I f necessary, clean the differential pressure lines: - with gases by
blowing out with compressed air - with liquids by rinsing. 2)
F or this purpose close valve 2 and 4, i.e. block the instrument.
T hen open valve 1 and 5 so that the effective pressure lines blow
out/rinse. 3)
A fter cleaning, close valves 1 and 5 4)
4 V ent instrument
O pen valves 2 and 4: Medium flows in
C lose valve 4: Minus side will be closed
O pen valve 3: Equalisation plus and minus side
B riefly open valve 6 and 7, then close again: Fill the measuring
instrument completely with the medium and remove air
5 C arry out position adjustment if the following conditions apply. If
the conditions are not fulfilled, then carry out the position
adjustment only after step 6. See "Quick Setup menu" in chapter
"
Flow measurement"
and chapter "Position adjustment". Condi-
tions:
- T
he process cannot be blocked.
- T he pressure extraction positions (A and B) are at the same
geodesic height.
6 S
et measurement loop to operation
T herefore close valve 3: Separate plus and minus side
O pen valve 4: Connect minus side
N ow:
V alves 1, 3, 5, 6 and 7 are closed 5)
V alves 2 and 4 open
V
alves A and B open (if available)
7 C arry out position adjustment if the flow must be blocked. In this
case, step 5 is deleted. See "Quick Setup menu" in chapter "Flow
measurement"
and chapter "Position adjustment".
8 C arry out adjustment, see "Informationen on flow measurement" in
chapter "Flow measurement"
2) A rrangement with 5 valves.
3) A rrangement with 5 valves.
4) A rrangement with 5 valves.
5) V alves 1, 3, 5: Configuration with 5 valves.
VEGADIF 55 • 4 … 20 mA/HART 61
7 S et up
31731
-EN
-081119