15
4 Mounting
VEGAPULS SR 68 • 4 … 20 mA/HART two-wire
38294-EN-130624
4. Loosen compression nut (1) completely with a wrench (width
across flats 41 mm) in the direction of the antenna
5. Remove the parabolic antenna (4) axially
6. Mount sensor flange on the adapter flange and fasten it tightly
7. Check if the O-ring seal is present on the connection piece and
make sure it is not damaged.
Note:
A damaged O-ring seal must be replaced: FKM (SHS FPM 70C3
GLT), FFKM (Kalrez 6375)
8. Remount the parabolic antenna (4)
9. Fasten compression nut (1) with a wrench (width across flats 41),
torque max. 50 Nm
10. Fasten counter nut (2) with a wrench (width across flats 36),
torque max. 40 Nm
Note:
On the version with rinsing air connection, make sure that the holes
in the antenna and in the process fitting coincide. This ensures a suf-
ficient air flow (the air is led through the holes to the feed system. A
rinsing of the whole parabolic antenna is not intended).
1
2
3
4
Fig. 5: Dismounting, parabolic antenna
1 Connection piece
2 Compression nut
3 Locknut
4 Parabolic antenna
4.3 Mounting preparations - Horn antenna
The instrument is also available in versions with an antenna whose
diameter is larger than the process fitting (thread, flange). In such
cases the antenna must be disconnected from the process fitting
before mounting. Proceed as follows:
1. Loosen the hexagon socket screws (3) on the antenna socket
with an Allen wrench (size 3)
2. Remove the antenna (4)
Note:
The plastic cone may not be pulled out of the antenna socket.
