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6

INS/ANAINST/025-EN Rev. B

  |  Navigator ADS551  |  Low level dissolved oxygen  |  Replacement / Upgrade procedures – wet section spares

6.4  Replacing the drain valve assembly and drain valve 

cable assembly

Part number:
— AW502 056

Referring to Fig. 6.5:
1.

Depress manual override button 

A

 on drain valve 

B

 to 

drain the wet-section.

2.

Disconnect clip-on cable connector 

C

 from the end of the 

drain valve coil housing by depressing clip 

D

.

3.

Disconnect the drain tube from barbed outlet connector 

E

 on the bottom of drain valve 

B

.

4.

Lock hex coupling 

G

 and rotate nut 

H

 clockwise to 

release couplings. Remove the valve assembly, complete 
with coupling 

G

. Remove coupling 

G

 from the valve 

assembly and fit to new valve, complete with new bonded 
seal 

I

.

5.

If fitting a new drain valve cable assembly, remove the 
wet-section cover as detailed in step 1 of Section 6.1, page 
4, loosen the drain valve cable gland in the wet-section 
PCB housing and proceed with steps 6, 7and 8 (below).
If using the existing cable, re-connect the clip-on cable 
connector 

C

 to the end of the drain valve coil housing.

6.

Disconnect the drain valve cable from the terminal block – 
see Fig. 6.7, page 7 and discard the cable.

7.

Feed the replacement drain valve cable through the cable 
gland and make connections to PCB wet-section terminals 
TB3 (see Fig. 6.3, page 5) and at the transmitter (see 
Operating instruction OI/ADS550-EN).

8.

Connect the drain valve clip-on cable connector 

C

 to the 

end of the drain valve coil housing.

9.

Reconnect the drain tube to barbed outlet connector 

E

 

on bottom of drain valve 

B

.

6.5  Replacing the temperature sensor assembly

Part number:
— AW502 220

Referring to Fig. 6.5:
1.

Depress manual override button 

A

 on drain valve 

B

 to 

drain the wet-section.

Referring to Fig. 6.6, page 7:
2.

Remove and retain 4 flowcell PCB cover fixing screws and 
washers 

C

 and remove PCB cover 

D

.

3.

Remove flowcell PCB housing gasket 

E

.

4.

Loosen cable gland 

F

.

5.

Loosen terminal screws 

G

 and disconnect temperature 

sensor cables 

H

 from TB5.

6.

Withdraw sensor cables 

H

 from flowcell PCB housing 

I

 

through cable gland 

F

.

7.

Unscrew the knurled nut on temperature sensor assembly 

J

 and carefully withdraw the temperature sensor from 

flowcell housing 

K

.

8.

Ensure a new O-ring 

L

 is securely located on the new 

temperature sensor, insert the sensor into flowcell housing 

K

 and tighten the knurled nut on temperature sensor 

assembly 

J

 finger-tight.

9.

Feed cables from the new temperature sensor through 
cable gland 

F

, make connections correctly at TB5 and 

tighten screws 

G

.

10. Tighten cable gland 

F

.

11. Refit flowcell PCB housing gasket 

E

 ensuring it is located 

correctly.

12. Refit PCB flowcell cover 

D

 and secure with 4 flowcell 

PCB cover fixing screws and washers 

C

.

Fig.  6.5  Replacing the drain valve assembly and drain valve cable assembly

A

B

C

D

E

F

G

H

I

IMPORTANT (NOTE) 

 

Check existing small O-ring 

L

 fitted on the end 

of the temperature sensor is withdrawn along 
with temperature sensor assembly 

J

.

Summary of Contents for Navigator ADS551

Page 1: ...tails replacement upgrade procedures for the following Navigator ADS551 wet section spares Before carrying out any procedures read Section 3 Health Safety These procedures must be carried out by a suitably trained technician Tools required Pozidrive screwdriver Slot head terminal screwdriver Anti static strap Spanners adjustable 2 For more information Further information is available from www abb ...

Page 2: ...y a trained technician Chemical Ensure personal protective equipment PPE such as gloves and eye protection are worn during any maintenance Observe all health and safety procedures for handling chemicals To familiarize yourself with handling precautions dangers and emergency procedures always review the Material Safety Data Sheets prior to handling containers reservoirs and delivery systems that co...

Page 3: ...eplacement Flowcell PCB assembly Section 6 1 page 4 replacement Drain valve assembly Section 6 4 page 6 replacement Section 7 2 page 10 upgrade Modbus cable assembly Section 6 6 page 7 replacement Flowmeter assembly Section 6 3 page 5 replacement Section 7 1 page 9 upgrade Flow control valve assembly Section 6 7 page 8 replacement Section 7 3 page 11 upgrade Temperature sensor assembly Section 6 5...

Page 4: ...ixing screws 6 Remake cable connections disconnected at step 3 refer to Fig 6 2 and Table 6 1 for terminal connections 7 Tighten the cable glands plugs and LLDO connector into the flowcell PCB housing to ensure a watertight seal 8 Refit or for new items fit flowcell PCB housing gasket C and cover B using 4 PCB cover fixing screws and washers A Ensure flowcell PCB gasket C is located correctly IMPO...

Page 5: ...ailed in step 1 of Section 6 1 page 4 3 Loosen cable gland B at the flowcell PCB housing C 4 Disconnect flowmeter cable D from wet section PCB terminals TB2 see Fig 6 7 page 7 and remove cable 5 Depress the QD coupling collar E on QD coupling F and lift the top QD coupling F complete with sample outlet tube G away from the flowmeter H 6 Depress the QD coupling collar K on QD coupling L and lift th...

Page 6: ... EN 8 Connect the drain valve clip on cable connector C to the end of the drain valve coil housing 9 Reconnect the drain tube to barbed outlet connector E on bottom of drain valve B 6 5 Replacing the temperature sensor assembly Part number AW502 220 Referring to Fig 6 5 1 Depress manual override button A on drain valve B to drain the wet section Referring to Fig 6 6 page 7 2 Remove and retain 4 fl...

Page 7: ...marked white green screen black and red 3 Withdraw Modbus cable C from the PCB housing and flowcell case assembly and discard 4 Feed the replacement Modbus cable through cable gland A and remake connections to the TB1 white green screen red and black terminal connections at the wet section PCB and at the transmitter 5 Refit the PCB cover by reversing the removal procedure Fig 6 6 Replacing the tem...

Page 8: ...w control valve F and lightly nip up coupling nut C do not tighten at this stage 6 Check that sample feed pipe D and flow control valve F are in the correct orientation 7 Tighten coupling nut E on the valve outlet side and coupling nut C on the sample inlet pipe finger tight then turn another 1 to 11 4 turns using a spanner 8 Turn the flow control valve F to the shut position reintroduce the sampl...

Page 9: ...on 6 1 page 4 6 Remove blanking plug I from front of flowcell PCB housing J and replace with supplied cable gland and O ring K 7 Pass flowmeter cable L through cable gland K at flowcell PCB housing J and make connections to PCB terminal block TB2 refer to Fig 6 7 page 7 8 Tighten cable gland K to form a watertight seal 9 Check sample outlet tube G is located correctly over tundish assembly H and r...

Page 10: ...ed 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 ...

Page 11: ...y nip up coupling nut L it may be necessary to cut or bend the pipe to arrange it into the correct orientation for mating with the flow control valve 7 Check that sample feed pipe E and flow control valve I are in the correct orientation 8 Tighten coupling nuts K on the valve outlet side and L on the sample inlet pipe finger tight and then turn another 1 to 11 4 turns using a spanner 9 Turn flow c...

Page 12: ...hts in this document and in the subject matter and illustrations contained therein Any reproduction disclosure to third parties or utilization of its contents in whole or in parts is forbidden without prior written consent of ABB ABB 2018 3KXA494540R2001 ABB Limited Measurement Analytics Howard Road St Neots Cambridgeshire PE19 8EU UK Tel 44 0 0870 600 6122 Fax 44 0 1480 213 339 Email instrumentat...

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