VEGA VEGADIF 55 4 … 20 mA_HART - Manual (Page 67)

VEGADIF 55 is used in all versions for level measurement in closed
vessels.
Note:
VEGADIF
55 in cell isolating diaphragm version is immediately ready
for operation.
VEGADIF 55 in flange version: After opening a probably existing block
valve, the instrument is ready for operation.
B efore you adjust VEGADIF 55 in basic version, you have to clean the
effective pressure lines and the instrument must be filled with the
medium.
+
A
B
6 7
3
2 4
1 5
+ –
II
I
III III
Fig. 67: Closed vessel with steam layer
I
VEGADIF 55
II Three-fold valve block
III Precipitator
1 , 5 Drain valves
2 , 4 Inlet valves
3 Breather valve
6 , 7 Vent valves on VEGADIF 55
A, B Block valves
P roceed as follows to prepare the actual adjustment:
1 F ill the vessel to just above the lower tap
2 F ill measuring system with medium
O pen valve A and B: Open block valves
Vessel with steam layer-
ing
VEGADIF 55 • 4 … 20 mA/HART 67
7 S et up
31731
-EN
-081119