Promag 53 PROFIBUS-DP/-PA 9 Trouble-shooting
Endress+Hauser 129
Removing the electrode Installing the electrode
1 Loosen Allen screw (a) and remove the
cover.
1 Insert new electrode (e) into retaining cylin-
der (g) from below. Make sure that the seals
at the tip of the electrode are clean.
2 Remove electrode cable (c) secured to
handle (b).
2 Mount handle (b) on the electrode and
insert locking pin (h) to secure it in position.
Caution:
Make sure that coil spring (k) is inserted.
This is essential to ensure correct electrical
contact and correct measuring signals.
2 Loosen knurled nut (d) by hand. This
knurled nut acts as a locknut.
2 Pull the electrode back until the tip of the
electrode no longer protrudes from retain-
ing cylinder (g).
3 Remove electrode (e) by turning handle
(b). The electrode can now be pulled out of
retaining cylinder (g) as far as a defined
stop.
Warning:
Risk of injury! Under process conditions
(pressure in the piping system) the elec-
trode can recoil suddenly against its stop.
Apply counter-pressure while releasing the
electrode.
3 Screw the retaining cylinder (g) onto ball-
valve housing (i) and tighten it by hand.
Seal (j) on the cylinder must be correctly
seated and clean.
Note:
Make sure that the rubber hoses on retain-
ing cylinder (g) and stop cock (f) are of the
same color (red or blue).
4 Close stop cock (f) 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.
4 Open stop cock (f) and turn handle (b) to
screw the electrode all the way into the
retaining cylinder.
5 Remove the electrode complete with
retaining cylinder (g).
5 Screw knurled nut (d) onto the retaining cyl-
inder. This firmly locates the electrode in
position.
6 Remove handle (b) from electrode (e) by
pressing out locking pin (h). Take care not
to lose coil spring (k).
6 Use the Allen screw to secure electrode
cable (c) to handle (b).
Caution:
Make sure that the machine screw securing
the electrode cable is firmly tightened. This
is essential to ensure correct electrical con-
tact and correct measuring signals.
7 Remove the old electrode and insert the
new electrode. Replacement electrodes
can be ordered separately from E+H.
7 Reinstall the cover and tighten (a) Allen
screw.
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