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4.3 Replacing the constant-head assembly, pressure switch
assembly and pressure switch cable
Part numbers:
Constant-head assembly: AW501 061
Pressure switch assembly: AW501 062
Pressure switch cable: AW501 085
Referring to Fig. 4.5:
A
1. Remove all tubing
2. Carefully disconnect the 2 spade connectors
C
of pressure switch
4.1, page 3, for cable connection details and remove /
discard the cable.
3. Unscrew the 2 securing screws
constant head body support arms
constant-head assembly, complete with pressure switch.
4. If replacing the pressure switch, unscrew the 4 retaining
F
screws
(note that the nuts
support bracket and may fall out when screws are removed).
5. Fit a replacement pressure switch and new O-ring
reverse order of removal – note the orientation (LOW) is
always uppermost.
6. If replacing the cable, fit in the reverse order of removal and
connect the 2 spade connectors
pressure switch, otherwise re-connect the existing spade
connectors.
7. Secure the constant-head assembly complete with pressure
switch, in the reverse order of removal.
Fig. 4.5 Replacing the constant-head assembly, pressure switch assembly
and pressure switch cable
4
INF13/115–EN Rev. B | Navigator 550 | Sodium wet-section| Spares replacement procedures
to the constant-head assembly.
B
. If replacing the cable, refer to Section
D
on the upper faces of the
E
and remove the
G
are constrained in the
B
to the rear of the
4.4 Replacing the solenoid valve assembly and
solenoid valve cable(s)
Part numbers:
Sodium multi-stream solenoid valve: AW501 053
Cable for multi-stream solenoid valve: AW501 081
Sodium single-stream solenoid valve: AW501 077
Cable for single-stream solenoid valve: AW501 080
Cable for calibration and reagent solenoid valve: AW501 082
at the rear
Note. Valve port configuration: on the single-stream solenoid
valve only (part number AW501 077), the N/C port is closest to
the electrical connector.
Referring to Fig. 4.6:
1. Remove all tubing connected to the valves
2. Unclip the valve cable connectors
each solenoid valve body. If replacing cable(s), refer to
Section 4.1 for cable connection details and remove / discard
the cables.
H
in the
3. Unscrew the 2 retaining screws
bracket
4. For each valve, unscrew the 2 valve securing screws and nuts
F
and remove the valve.
5. Ensure the valve cable connector for each valve is facing
downwards and fit each new valve assembly to the plate
using the 2 valve securing screws and nuts
above for single-stream valve port configuration.
6. Refit plate
C
.
7. If replacing cable(s), fit in the reverse order of removal and
re-clip cable connector(s)
valve body. Ensure the correct cable type is connected at
each solenoid valve.
8. Reconnect all tubing to the new valves.
Single- and multi-
stream solenoid
valve(s)
Fig. 4.6 Replacing the solenoid valve assembly and solenoid valve cables
(multi-stream version shown)
B
C
E
and withdraw the valves complete with plate
D
E
to the bracket
using the 2 retaining screws
B
to the underside of each new
Calibration and reagent stream
switching solenoid valves
4 Replacement procedures
A
.
from the underside of
D
that hold plate
to
D
.
D
F
– refer to
.
Note
IN/OUT
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