67
10 Diagnosis, asset management and service
VEGADIF 85 • Profibus PA
53569-EN-230814
4. Clean O-ring grooves and separating diaphragms with a suitable
cleaner and soft cloth
Note:
Note additional cleaning for oil and grease-free version
Proceed as follows:
1. Insert new, undamaged O-ring seals into the grooves, check for
correct position
2. Mount process flanges carefully on the differential pressure
measuring cell, the seal must remain in the groove
3. Insert undamaged screws and nuts, screw together crosswise
4. First tighten with 8 Nm, then with 12 Nm
5. Finally tighten with 16 Nm at 160 bar, 18 Nm at 400 bar, 22 Nm
for copper gaskets.
The process flanges are exchanged.
Note:
After installing the device in the measuring point, carry out a position
correction again.
10.6 Exchange process module on version IP68
(25 bar)
On version IP68 (25 bar), the user can exchange the process module
on site. Connection cable and external housing can be kept.
Required tools:
•
Hexagon key wrench, size 2
Caution:
The exchange may only be carried out in the complete absence of
line voltage.
In Ex applications, only a replacement part with appropriate Ex ap
-
proval may be used.
Caution:
During exchange, protect the inner side of the parts against contami
-
nation and moisture.
Proceed as follows when carrying out the exchange:
1. Losen the fixing screw with the hexagon key wrench
2. Carefully detach the cable assembly from the process module
Mounting