Endress+Hauser Cerabar S Series - Changing the Seal; Replacement Parts

8.4 Changing the seal
The seal in contact with the medium inside the adapter of the Cerabar S PMC 731 can
be replaced. Except for the PTFE seal (Structure D), all seals can thus be interchanged
as required. The different temperature limits should thus be observed for individual
materials.
Changing the seal
•
Loosen the screws on the retaining ring
of the adapter.
•
Remove the retaining ring and adapter.
•
Replace seal.
The surfaces each side of the seal and
the seal itself must be free from fibres
and dirt.
•
Secure the adapter with the retaining
ring and screws
Changing the PTFE seal
•
Loosen the screws on the retaining ring
of the adapter.
•
Remove the retaining ring and adapter.
•
Replace seal.
The surfaces each side of the seal and
the seal itself must be free from fibres
and dirt.
•
Secure the adapter with the retaining
ring and screws.
•
Warm the instrument to 80…85°C and
maintain at this temperature for about 2
hours to condition the seal.
8.5 Replacement parts
The diagram on the next page shows all replacement parts, together with their order
numbers, which can be ordered from Endress+Hauser.
When ordering replacement parts, please note the following:
•
If parts given in the order code are to be replaced, then it must be ensured that the
order code (instrument designation) on the nameplate is still valid.
•
If the instrument designation on the nameplate has changed then a modified
nameplate must also be ordered. The information about the new instrument must
then be entered on the modified nameplate. This must then be attached to the
housing of the Cerabar S.
•
It is not possible to convert a standard instrument into an Ex instrument by replacing
its parts.
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
4...20 m
A
Tes
t
1
2
3
Seal
Adapter
Holding ring
with screws
BA211Y56
Seal Lower temperature limit
1 FPM, Viton –20 °C
6 FPM, Viton grease-free –10 °C
A FPM, Viton oil and grease-free for oxygen –10…+60 °C
8 NBR (DVGW) –20…+80 °C
2 NBR –20 °C
7FFKMKalrez +5°C
4 EPDM –40 °C
D PTFE and Hastelloy C 4 –20…+85 °C
8 Maintenance and Repair Cerabar S
52 Endress+Hauser