Endress+Hauser Promag 50 Installationsanleitung Seite 4

Replacing exchangeable measuring electrodes
A Replacing measuring electrode (5)
NOTICE
The Promag W sensor (DN 350 to 2000) is available with
exchangeable measuring electrodes as an option. This design
permits the measuring electrodes to be replaced or cleaned under
process conditions.
1. Loosen Allen screw (1) and remove the cover.
2. Remove electrode cable (3) secured to handle (2).
3. Loosen knurled nut (4) by hand. This knurled nut acts as a locknut.
4. Remove electrode (5) by turning handle (2). The electrode can
now be pulled out of retaining cylinder (7) as far as 
a defined stop.
WARNING
Risk of injury. Under process conditions (pressure in the
piping system) the electrode can recoil suddenly against its stop.
Apply counterpressure while releasing the electrode.
5. Close stop cock (6) after pulling out the electrode as far as it will go.
WARNING
Do not subsequently open the stop cock, in order to prevent fluid
escaping.
6. Remove the electrode (5) complete with retaining cylinder (7).
7. Remove handle (2) from electrode (5) by pressing out locking
pin (8). Take care not to lose coil spring (11).
8. Remove the old electrode (5) and insert the new electrode.
Replacement electrodes can be ordered separately from
Endress+Hauser.
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B Installing measuring electrode (5)
1. Insert new electrode (5) into retaining cylinder (7) from below.
Make sure that the seals at the tip of the electrode are clean.
2. Mount handle (2) on the electrode and insert locking pin (8) to
secure it in position
CAUTION
Make sure that coil spring (11) is inserted. This is essential to
ensure correct electrical contact and correct measuring signals.
3. Pull the electrode back until the tip of the electrode no longer
protrudes from etaining cylinder (7).
4. Screw the retaining cylinder (7) onto ballvalve housing (9) and
tighten it by hand. Seal (10) on the cylinder must be correctly
seated and clean.
NOTICE
Make sure that the rubber hoses on retaining cylinder (7) and stop
cock (6) are of the same color (red or blue).
5. Open stop cock (6) and turn handle (2) to screw the electrode
all the way into the retaining cylinder.
6. Screw knurled nut (4) onto the retaining cylinder. This firmly
locates the electrode in position.
7. Use the Allen screw to secure electrode cable (3) to handle (2).
CAUTION
Make sure that the machine screw securing the electrode cable is
firmly tightened. This is essential to ensure correct electrical
contact and correct measuring signals.
8. Reinstall the cover and tighten Allen screw (11).
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Legend
1 = Allen screw
2 = Handle
3 = Electrode cable
4 = Knurled nut (locknut)
5 = Measuring electrode
6 = Stop cock
7 = Retaining cylinder
8 = Locking pin (for handle)
9 = Ball-valve housing
10 = Seal (retaining cylinder)
11 = Coil spring
A0013789
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Endress + Hauser