Aztec 600 aluminium, ammonia, color, iron, manganese, phosphate
Single- and multi-stream colorimetric analyzers
13 Maintenance
72
IM/AZT6CR–EN Rev. J
7. Referring to Fig. 13.14, remove the four screws
N
and
remove the motor and sample tube
O
from the lower half
of the measuring cell.
8. Referring to Fig. 13.15:
a. Slide the sample tube
P
off the piston assembly
Q
. Discard the sample tube.
b. Loosen retaining grub screw
R
, unscrew the
piston assembly
Q
from the piston shaft
S
and
discard the piston assembly.
c. Lightly lubricate the new O-ring
T
and piston seal
U
with the silicon grease from the piston kit.
d. Fit the O-ring and piston seal to the new piston
base
V
.
e. Insert the piston base, complete with seal and
O-ring, into the new piston top
W
and secure
loosely with the new piston cone adjusting screw
X
and spring washer
Y
.
Do not tighten the piston cone adjusting screw at
this stage
.
f.
Insert the new piston assembly
Q
into the top of
the new sample tube
P
and, holding the piston
firmly, tighten the piston cone adjusting screw
X
until a continuous seal is achieved between the
piston seal
U
and the sample tube
P
.
g. Remove the piston assembly from the sample tube
and refit it to the piston shaft
S
. Fit and tighten the
new retaining grub screw
R
.
h. Remove O-ring
Z
from the base of the motor
mounting plate and discard.
i.
Fit new O-ring
Z
ensuring it is located correctly in
the groove in the base of the motor mounting plate.
j.
Fit the sample tube over the piston assembly and
slide it up until it contacts O-ring
Z
.
Fig. 13.14 Removing the Motor and Sample Tube
O
N
Fig. 13.15 Dismantling/Reassembling the Piston
R
X
V
T
U
S
W
P
Z
Q
Y
