4 Replacement procedures
Navigator 550 | Sodium wet-section | Spares replacement procedures |
INF13/115–EN Rev. B
3
4.1 Replacing the PCB housing seals, PCB cover and PCB
Part numbers:
PCB housing seals: AW501 051
PCB cover: AW501 052
PCB: AW501 050
Referring to Fig. 4.2:
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. 4.3 and Table 4.1 for terminal connection details:
9. Make cable connections at the new PCB.
Referring to Fig. 4.2:
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.
4.2 Replacing the flowmeter assembly and flowmeter cable(s)
Part numbers:
Flowmeter: AW501 068
Single-stream cable: AW501 086
Multi-stream cable: AW501 087
Referring to Fig. 4.4:
1. Disconnect the flowmeter cable
A
from the flowmeter
B
and remove the sample inlet tubing
C
from the flowmeter
inlet spigot
D
. If replacing cable(s), refer to Section 4.1 for
cable disconnection details and remove / discard the cable(s).
2. Disconnect the flowmeter
B
from the QD connector
E
by
pressing the ring and pulling the flowmeter away.
3. Fit new flowmeter(s) / cable(s) in the reverse order of removal
– ensure the correct cable type (multi-stream or
single-stream) is connected at each flowmeter.
Fig. 4.2 Replacing the PCB housing seals, PCB cover and PCB
Fig. 4.3 Wet section PCB cable entries – see Table 3.1 for connections
B R
SC R
G W
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36
2
3
4
5
6
7
8
1
Addi
ti
o
n
al da
is
y -c
hain
cab
le 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
Sodium electrode
Screen
Core
34
36
N/A
3
Pt1000 temperature sensor
Red
Blue
33
35
N/A
4
Reference electrode
Black
32
N/A
5
Pressure switch
Red
Black
25
26
N/A
N/A
6
Calibration valve
Green
Brown
Red
Black
Yellow
Orange
7
8
9
10
11
12
Valve 1 +ve
Valve 1 –ve
Valve 2 +ve
Valve 2 –ve
Regen. +ve
Regen. –ve
7
Stream switch valve –
single-stream
Red
Black
Green
Brown
Red
Black
Yellow
Orange
1
2
1
2
3
4
5
6
Valve 1 +ve
Valve 1 –ve
Valve 1 +ve
Valve 1 –ve
Valve 2 +ve
Valve 2 –ve
Valve 3 +ve
Valve 3 –ve
Stream switch valve –
multi-stream
8
Flowmeter – stream 1
Red
Brown
Black
13
15
17
+ve
GND
–ve
Flowmeter – stream 2
(multi-stream)
Orange
Yellow
Green
20
22
24
+ve
GND
–ve
Flowmeter – stream 3
(multi-stream)
Blue
Violet
Grey
19
21
23
+ve
GND
–ve
Table 4.1 Wet-section cable terminal connections
Fig. 4.4 Replacing the flowmeter assembly and flowmeter cable(s)
