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6.4 Replacing the drain valve assembly and drain valve
cable assembly
Part number:
— AW502 056
Referring to Fig. 6.5:
1. Depress manual override button
drain the wet-section.
2. Disconnect clip-on cable connector
drain valve coil housing by depressing clip
3. Disconnect the drain tube from barbed outlet connector
E
on the bottom of drain valve
4. Lock hex coupling G and rotate nut H clockwise to
release couplings. Remove the valve assembly, complete
with coupling G. Remove coupling G from the valve
assembly and fit to new valve, complete with new bonded
seal I.
5. If fitting a new drain valve cable assembly, remove the
wet-section cover as detailed in step 1 of Section 6.1, page
4, loosen the drain valve cable gland in the wet-section
PCB housing and proceed with steps 6, 7and 8 (below).
If using the existing cable, re-connect the clip-on cable
connector C to the end of the drain valve coil housing.
6. Disconnect the drain valve cable from the terminal block –
see Fig. 6.7, page 7 and discard the cable.
7. Feed the replacement drain valve cable through the cable
gland and make connections to PCB wet-section terminals
TB3 (see Fig. 6.3, page 5) and at the transmitter (see
Operating instruction OI/ADS550-EN).
8. Connect the drain valve clip-on cable connector C to the
end of the drain valve coil housing.
9. Reconnect the drain tube to barbed outlet connector E
on bottom of drain valve B.
I
A
D
Fig. 6.5 Replacing the drain valve assembly and drain valve cable assembly
6
INS/ANAINST/025-EN Rev. B | Navigator ADS551 | Low level dissolved oxygen | Replacement / Upgrade procedures – wet section spares
A
B
on drain valve
to
C
from the end of the
D
.
B
.
H
F
G
E
B
C
6.5 Replacing the temperature sensor assembly
Part number:
— AW502 220
Referring to Fig. 6.5:
1. Depress manual override button
drain the wet-section.
Referring to Fig. 6.6, page 7:
2. Remove and retain 4 flowcell PCB cover fixing screws and
washers C and remove PCB cover D.
3. Remove flowcell PCB housing gasket E.
4. Loosen cable gland F.
5. Loosen terminal screws G and disconnect temperature
sensor cables H from TB5.
6. Withdraw sensor cables H from flowcell PCB housing I
through cable gland F.
7. Unscrew the knurled nut on temperature sensor assembly
J and carefully withdraw the temperature sensor from
flowcell housing K.
IMPORTANT (NOTE)
Check existing small O-ring L fitted on the end
of the temperature sensor is withdrawn along
with temperature sensor assembly J.
8. Ensure a new O-ring L is securely located on the new
temperature sensor, insert the sensor into flowcell housing
K and tighten the knurled nut on temperature sensor
assembly J finger-tight.
9. Feed cables from the new temperature sensor through
cable gland F, make connections correctly at TB5 and
tighten screws G.
10. Tighten cable gland F.
11. Refit flowcell PCB housing gasket E ensuring it is located
correctly.
12. Refit PCB flowcell cover D and secure with 4 flowcell
PCB cover fixing screws and washers C.
A
B
on drain valve
to
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