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7.2 Upgrading the drain valve assembly
Upgrade kit part number:
— AW502 240
Referring to Fig. 7.2:
1. Unscrew and remove blanking plug A (with O-ring)
at base of flowcell assembly B.
IMPORTANT (NOTE)
There will be sample left in the flowcell so it is
advisable to have a beaker or similar receptacle
to catch the sample.
2. Fit sealing washer C to male adaptor coupling D, screw
this assembly into flowcell base B and tighten.
3. Fit Boded seal E onto thread of male stud coupling F,
screw into the upstream port of the drain solenoid valve
G and tighten – note arrow position on valve body.
4. Wrap PTFE tape around the thread of barbed connector
H and screw into the outlet port of the drain solenoid
valve G.
5. Offer drain solenoid valve assembly G up to male adaptor
coupling D and push onto spigot; orientate the valve (as
shown in Fig. 7.2) and tighten couplings D and F
together – ensure couplings are fully tightened.
6. Fit the supplied length of drain tube I onto the barbed
connector J on drain valve G and route as short and
straight as possible to a suitable drain.
7. Remove blanking plug K from the underside of flowcell
PCB housing L and replace with supplied cable gland
and O-ring M.
8. Feed cable N from drain solenoid valve assembly G
through the cable gland M and make connections to
PCB terminal block TB3 – refer to Fig. 6.7, page 7.
9. Tighten cable gland M to form a watertight seal.
Referring to Fig. 7.1, page 9:
10. Check sample outlet tube G is located correctly over
tundish assembly H and restart sample flow.
Referring to Operating instruction OI/ADS550-EN:
11. Configure the transmitter by selecting Sensor Setup,
scrolling to Calibration Valve and selecting Enabled.
(This enables auto calibrations to be configured.)
10
INS/ANAINST/025-EN Rev. B | Navigator ADS551 | Low level dissolved oxygen | Replacement / Upgrade procedures – wet section spares
L
K
Correct drain
valve orientation
Fig. 7.2 Upgrading the drain valve assembly
C
M
D
F
E
G
H
J
I
Upgraded drain valve
fitted and connected
B
A
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