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23
Replacing the Immersion Tube
The immersion tube must be removed or replaced:
• for general maintenance
• for cleaning the immersion tube, e.g. after the sensor is broken
• for replacing the sensor gasket (O-ring)
• when an immersion tube made of another material is required
• in the event of a technical fault of the drive unit
WARNING!
To separate the sensor lock-gate safely from the process, make sure
that it is disconnected from all process media and process pressure.
CAUTION!
Before working on the drive unit, make sure that the sensor lock-gate is in
SERVICE position (see “Function Description” on page 10).
First, separate the drive unit from the process unit. (See “Removing the Drive Unit” on page 21.)
1) After having separated the drive unit from
the process unit, move the drive unit into
PROCESS position.
2) In PROCESS position two screws
(Z)
are
accessible.
3) Loosen the two screws
(Z)
by approx. 4 turns
using a screwdriver (TX25) (do not remove
them).
4) Turn the immersion tube
(T)
counter clockwise
by approx. 60°.
5) The bayonet coupling opens and the immer-
sion tube
(T)
can be pulled out in direction of
the arrow.
6) Now, O-ring
(D)
(sensor gasket) is visible.
Check and replace if required. (For O-ring
dimensions, see page 43 “Sealing Kits for
Maintenance and Servicing”.)
Note:
Contrary to the figure, the O-ring may still be
in the immersion tube. From there, you can
easily remove it.
Z
T
D
Removing the Immersion Tube
Screwdriver no. 6
included in accessory:
ZU 0680, ZU 0740, ZU 0754
Approx. 60°
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