Endress+Hauser promag 31, Operating Manual

Page: 17 / 60

Replacement measuring electrodes
Dismantling the electrode:
1. Loosen the Allen screws (a) of the cap/cover.
2. Unscrew the electrode cable (c) attached to the
rotary arm (b).
3. Undo the knurled nut (d) by hand. This nut is
used as a counter nut.
4. Remove the electrode (e) using the rotary arm
(b). This can now be taken out from the holder
(g) as far as the stop allows.
Warning!
The electrode can spring back to the
stop. Keep pressing against it
while loosening.
5. Close the shut-off valve (f) after the electrode
has been taken out as far as the stop.
Warning!
Do not attempt to open the shut-off
valve. Keeping it shut prevents
medium from escaping.
6. Unscrew the entire electrode along with the
holding cylinder (g).
7. Remove the pins (h) below the rotary arm.
8. Replace electrode with a new one.
A set of new electrodes can be ordered from
E+H.
Assembling the electrode:
1. Slide the new electrode (e) through the holding
cylinder (g) from below.
Gaskets at the tip of the electrode must be in
place and clean.
2. Connect the rotary arm (b) and electrodes
together using the pins (h). Ensure that the
small coil spring is in place.
3. Pull back the electrode as far as possible so
that the tip does not protrude out from the hold-
ing cylinder (g).
4. Screw the holding cylinder onto the shut-off unit
(I) and tighten by hand.
Note!
Gasket (j) on the holding cylinder
must be in place and clean.
5. Open the shut-off value (f) and screw in the
electrode using the rotary arm (b). Pull the elec-
trode on by hand.
6. Screw the knurled nut (d) onto the holding cylin-
der in order to clamp the electrode tight.
7. Secure the electrode cable (c) to the rotary arm
using the Allen screw.
Caution!
Ensure that the Allen screw of the
electrode cable is tight. A close
electrical contact cannot otherwise
be guaranteed and this can lead to
measurement errors.
The Promag F Type DN 350...DN 600 is available with replacement electrodes.
This version enables the measuring electrodes to be cleaned or replaced under process conditions.
Replacing an electrodes is carried out as follows:
b
a028
y
6
7
a
h
f
i
b
d
g
a
j
e
c
right side:
Type DN 350...600
Fig. 19
Promag 31 2. Mounting and Installation
Hauser 17