ABB 9408 Series Gebruiksaanwijzing - Pagina 13

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5.1.2 Dip Systems

The procedure is identical to that for the Floating Ball System

except that, in this case, it is only necessary to remove and

replace the protective shroud instead of the ball. The shroud

is removed from the end of the sensor block by unscrewing it.

5.1.3 Submersible Systems

The procedure is identical to that for the Dip System – see

Section 5.1.2 Dip Systems.

5.2 Replacing the Oxygen Sensor Block

5.2.1 Floating Ball System – Fig. 5.2

1) To avoid damaging the sensor capsule dry around it then

carefully remove it from the end of the sensor block and

store safely. DO NOT touch the membrane.

Caution. Do not leave the capsule exposed to air for more

than 30 minutes as the membrane will dry out.

2) Disconnect the cable from the dissolved oxygen transmitter

(or junction box if applicable) and attach a draw wire of

suitable length.

3) Slacken the cable gland on the end of the boom.

Securing Ring

Elbow Union

Boom

Ball Float

Sensor Block

Optional Water

Wash Nozzle

Sensor Capsule

Fig. 5.2 Replacing the Oxygen Sensor Body

4) Remove the self tap screw and pull off the end cap.

5) Draw the cable through the gland.

6) Unscrew the securing ring of the ball float (whilst restraining

the ball from turning) and withdraw the ball from the elbow

union.

7) Carefully unscrew the sensor block from the end of the

sensor pipe.

8) If fitted, disconnect the water wash feed tube from the

sensor block.

9) Pull the cable through the boom, leaving sufficient draw

wire at the end cap end to enable the replacement to be

pulled through.

10) Disconnect the sensor block cable from the draw wire.

11) Attach the draw wire to the replacement sensor block cable

and re-assemble in the reverse order of the previous steps.

12) Remove the dummy capsule from the replacement sensor

block and carefully replace the sensor capsule into the

sensor block.

5.2.2 Dip Systems

The procedure is identical to that for the floating ball system

except that it is only necessary to remove and replace the

protective shroud instead of the ball. Remove the shroud by

unscrewing it.

Optional Water Wash Feed Tube

Connecting Cable

Temperature Compensator

5 MAINTENANCE...

End Cap

Sensor Pipe