3 Replacement procedures
2
INF13/114–EN
| Navigator 550 | Hydrazine wet-section | Spares replacement procedures
3.1 Replacing the PCB housing seals, PCB cover and PCB
Part numbers:
PCB housing seals: AW503 051
PCB cover: AW503 052
PCB: AW503 050
Referring to Fig. 3.2:
1. Remove and retain the 4 PCB cover fixing screws and
washers
A
and remove the PCB cover
B
.
2. If replacing PCB housing seals, remove and discard housing
seal
C
.
3. Disconnect all cables from the PCB
D
, loosen all cable
glands and remove cables.
4. Remove and retain the 4 PCB housing fixing screws and
washers
E
and remove the PCB housing
F
.
5. If replacing PCB housing seals, lift PCB housing seal
G
out
of the groove and discard.
6. Remove and retain the 2 PCB fixing screws and washers
H
and remove the PCB
D
. If replacing PCB housing seals, fit
the new (large) PCB housing seal
G
in the groove (a small
amount of silicone sealant or grease can be used to help
retain the seal in place).
7. Fit the new PCB to the rear of the main case using the 2 PCB
retaining screws and washers
H
.
8. Refit the PCB housing
E
using the 4 PCB housing fixing
screws and washers
D
.
Referring to Fig. 3.3 and Table 3.1 for terminal connection details:
9. Make cable connections at the new PCB.
Referring to Fig. 3.2:
10. If replacing PCB housing seals, fit the new (small) PCB
housing seal
C
between the PCB cover
B
and PCB
housing
F
(a small amount of silicone sealant or grease can
be used to help retain the seal in place).
11. Refit the PCB cover
B
using the 4 PCB cover fixing screws
and washers
A
, ensuring PCB housing seal
C
is located
correctly in its groove.
3.2 Replacing the flowmeter assembly and flowmeter cable
Part numbers:
Flowmeter: AW503 068
Flowmeter cable: AW503 086
Referring to Fig. 3.4:
1. Disconnect the flowmeter cable
A
from the flowmeter
B
.
remove the sample inlet tubing
C
from the flowmeter inlet
spigot
D
. If replacing cable(s), refer to Section 3.1 for cable
disconnection details and remove / discard the cable.
2. Disconnect the flowmeter
B
from the QD connector
E
above the flowmeter by pressing the ring and pulling the
flowmeter away.
3. Fit the new flowmeter / cable in the reverse order of removal.
Fig. 3.2 Replacing the PCB housing seals, PCB cover and PCB
Fig. 3.3 Wet section PCB cable entries
B R
Scr
G W
1 3 5 7 9 1 1 13 15 17 19 21 23 25 27 29 31 33 3
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36
2
3
4
5
1
Additional
'daisy-chain'
cable
connections
Entry
Cable
Color
Terminal
Description
1
Serial (Modbus) – refer to
Operating Instructions
for
multiple wet-section
setup.
Red
Black
Green
White
Screen
R
B
G
W
SCR
24 V
0 V
Data +ve
Data –ve
Screen
2
Sensor block
Blue
Red
Black
Yellow
31
32
33
35
+ve
–ve
Pt1000
Pt1000
3
Pressure switch
Red
Black
25
26
N/A
N/A
4
Calibration
valve
Red
Black
9
10
+ve
–ve
5
Flowmeter (if fitted)
Red
Brown
Black
13
15
17
+ve
GND
–ve
Table 3.1 Wet-section cable terminal connections
Fig. 3.4 Replacing the flowmeter assembly and flowmeter cable
