Siemens SITRANS LG240 Operating Instructions Manual page 63

PBD-51041038
You can exchange the seal in case of wear or replace the existing seal
for resistance reasons against a seal of another material. If you have
to remove the process fitting of the probe for cleaning purposes, then
you also have to use a new seal.
To loosen the measuring rod, you need a size 10 wrench.
Note:
Instruments with 3A manufacturer declaration have to be specially
sealed. Such instruments must therefore be returned to the factory
when a seal replacement is necessary.
Three different seal sets are available. They contain the seals for the
process fitting and the measuring rod. For segmented rods, several
seals for the measuring rod are included.
Exchange the seal whenever you loosen connection.
•
EPDM (Freudenberg 70, EPDM 291), -20 ... +130 °C
•
FFKM (Kalrez 6221), -20 ... +150 °C
•
FEPM (Vi 602 Extreme-ETP, COG), -10 ... +150 °C
Caution:
Remember that the polished rod of the food version is very sensitive
to damage and scratching. Use special tools in order to avoid damag-
ing the surface.
1. Loosen the rod by applying a fork spanner to the flat surfaces
(SW 10), provide counterforce manually on the process fitting
2. Screw out the loosened measuring rod by hand
3. Push the enclosed new seal ring (9.25 x 1.78) onto the thread of
the measuring rod.
SITRANS LG240 - Operating Instructions
63