GESTRA OR 52-7, Installation Instructions Manual

Page: 28 / 44

28
Maintenance
- continued -
Replacing glass cylinder
. Close the inlet and outlet and the connection for the purging valve.
2. Undo the connection for inlet and outlet and the connection for purging water of the purging valve
o
Fig. 6 .
3. Unscrew the two hexagon-head screws
f
at the back that fix the measuring sensor and take the
measuring sensor off the support.
4. Unscrew the two fixing screws
f
at the front that fix the cover
d
and take off the cover
d
.
5. Pull the cleaning device
m
out of the base
l
. Unscrew the fixing screws
f
for the base
l
and
take out the base
l
.
6. Press the glass cylinder
0
upwards or downwards out of the sensor body
9
.
7. Remove the cover
d
and the O-rings
a b c
in the base
l
, clean the sealing surfaces and insert
new O-rings
a b c
.
8. Make sure that the body
9
, cover
d
and base
l
are dry inside. If you encounter moisture use
compressed air to blow-dry the body
9
. Note that residual moisture with cold fluids will precipitate
on the glass cylinder
0
and leads to wrong measurements.
6. Use the fixing screws
f
to attach the base
l
to the body
9
and push the cleaning devie
m
approx. 30 mm upwards.
7. Hold the new and dry glass cylinder
0
at the end face and insert it into the body
9
.
8. Use the two fixing screws
f
at the front to fix the cover
d
to the body
9
.
9. Use the two fixing screws
f
at the back to fix the measuring sensor to the support.
0. Re-connect the inlet and outlet and the connection for the purging water at the purging valve
o
Fig. 6 . Re-open the purging connection of the purging valve as well as inlet and outlet.
Replacing the plunger of the cleaning device
. Close inlet, outlet and connection for purging valve
o
Fig. 6.
2. Undo the connection for purging water at the purging valve
o.
3. Pull out the cleaning device
m
and unscrew the four hexagon-head screws
f
of the base
l
. Take
out the base
l
and cleaning device
m
.
4. Use a screwdriver to bend the inside teeth of the quick-fixing ring
k
out and remove the quick-
fixing ring.
4. Pull out the plunger
g h i j
and insert the new plunger.
5. Insert a new quick-fixing ring
k
: Make sure that the teeth point away from the plunger.
6. Take the O-rings
a b c
out of the base
l
, clean the sealing surfaces and insert new O-rings
a b c
.
7. Insert the plunger
g h i j
of the cleaning device
m
into the glass cylinder
0
and screw the
base
l
to the body
9
.
8. Re-attach the purging connection to the purging valve
o
, then open the purging connection and the
inlet and outlet.
Note
Parts
g h i j
(locking ring, ring, cleaning ring and plunger) are assembled when
delivered. See spare parts kit, ref. no. 389504, page 30.