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