VEGA VEGAPULS 68 (≥ 2.0.0 - ≥ 4.0.0) Foundation Fieldbus - Manual (Page 15)

15
4 Mounting
VEGAPULS 68 • Foundation Fieldbus
36538-EN-121011
3
4
1
2
Fig. 5: Dismounting of the horn antenna
1 Marking of the polarisation plane
2 Marking at the antenna socket
3 Hexagon screws on the antenna socket
4 Antenna
4.3 Mounting preparations - Parabolic antenna
The instrument is also available in versions where the antenna has
a diameter larger than the process fitting (thread, flange). With such
versions the antenna must be disconnected from the process fitting
before mounting. Proceed as follows:
1. Clamp VEGAPULS 68 with the flange, e.g. in a bench vice
2. Hold the connection piece (3) with a wrench on the flat surfaces
(width across flats 22 mm)
3. Loosen counter nut (2) completely with a wrench (width across
flats 36 mm) in the direction of the antenna
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 (Viton) article no.
2.28248, FFKM (Kalrez 6375) article no. 2.27351
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-