ABB Navigator 550 Replacement Procedures page 4

4.3 Replacing the flowmeter assembly
Part number: AW502 060

Flowmeter assembly: AW502 060
Referring to Fig. 4.6:
1. Depress the manual override button
assembly to drain the wet-section.
2. Remove the wet-section PCB cover as detailed in step 1 of
Section 4.1, page 3.
Referring to Fig. 4.5:
A
3. Loosen cable gland
4. Disconnect the flowmeter cable
terminals 13 (red, +ve), 15 (brown, GND) and 17 (black –ve) –
see Fig. 4.3, page 3 and remove cable.
5. Depress the QD coupling collar
lift the top QD coupling
F
away from the flowmeter
6. Depress the QD coupling collar
lift the flowmeter away.
7. Fit the replacement flowmeter into the QD coupling
E
refit QD coupling to the flowmeter outlet.
Note. The orientation of the flow arrow on the flowmeter
must be upwards.
8. Pass the flowmeter cable through the cable gland
wet-section PCB housing
PCB terminals 13 (red, +ve), 15 (brown, GND) and 17 (black
–ve) – see Fig. 4.3, page 3.
9. Refit the PCB cover as detailed in step 11, Section 4.1,
page 3.
10. Ensure the sample outlet tube
I
tundish assembly .
Fig. 4.5 Replacing the flowmeter assembly and flowmeter cable
4 INF12/113–EN Rev. C | Navigator 550 | Low level dissolved oxygen wet-section | Spares replacement procedures
A
on the drain valve
at the wet-section PCB housing
C
from wet-section PCB
D
on QD coupling
E
complete with sample outlet tube
G
.
J
on QD coupling
A
B
and terminal connections to
F
is located correctly in the
4.4 Replacing the drain valve assembly
and drain valve cable assembly
Part numbers:

Drain valve assembly: AW502 056

Drain valve cable assembly: AW502 085
Referring to Fig. 4.6:
1. Depress the manual override button
to drain the wet-section.
2. Disconnect the clip-on cable connector
the drain valve coil housing by depressing the clip
B
.
3. Disconnect the drain tube from the barbed outlet connector
E
on the bottom of the drain valve
4. Lock hex coupling
couplings. Remove the valve assembly, complete with
G
E
coupling
and
and fit to new valve, complete with new bonded seal
5. If fitting a new drain valve cable assembly, remove the
K
wet-section cover as detailed in step 1 of Section 4.1, page 3
and
and loosen the drain valve cable gland in the wet-section PCB
housing and proceed with steps 7, 8 and 9 below.
K
and
If using the existing cable, re-connect the clip-on cable
connector
6. Disconnect the drain valve cable from the terminal block – see
Fig. 4.3, page 3 and discard the cable.
7. Feed the replacement drain valve cable through the cable
at the
gland and make connections to the black, red, screen, green
and white PCB wet-section terminals (see Fig. 4.3, page 3)
and at the transmitter (see
8. Connect the drain valve clip-on cable connector
end of the drain valve coil housing.
Fig. 4.6 Replacing the drain valve assembly and drain valve cable
4 Replacement procedures
A
B
G H
and rotate nut
G
. Remove coupling from the valve assembly
C
to the end of the drain valve coil housing.
OI/ADS550-EN)
B
on the drain valve
C
from the end of
D
.
.
clockwise to release
I
.
.
C
to the