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CONTENTS
1 INTRODUCTION .......................................... 1
2 SYSTEM TYPES .......................................... 2
2.1 Unpacking ...........................................................2
2.2 Floating Ball System ...........................................2
2.2.1 Assembled Version .................................2
2.2.2 Kit Version ...............................................2
2.3 Dip Systems ........................................................3
2.3.1 Assembled Version .................................3
2.3.2 Kit Version ..............................................3
2.4 Submersible System ...........................................3
3 MECHANICAL INSTALLATION ................... 4
3.1 Assembling Kit Systems .....................................4
3.1.1 Floating Ball ............................................4
3.1.2 Dip ..........................................................5
3.2 Installation ...........................................................6
3.2.1 Floating Ball System ...............................6
3.2.2 Dip Systems ...........................................7
3.2.3 Submersible Systems ............................7
3.3 Water Supply for Water Wash Systems ..............8
4 ELECTRICAL INSTALLATION ..................... 9
Transmitter .........................................................9
4.2 Calibrating the Sensor ........................................9
5 MAINTENANCE ......................................... 10
5.1 Replacing the Oxygen Sensor Capsule ............10
5.1.1 Floating Ball System .............................10
5.1.2 Dip Systems .........................................11
5.1.3 Submersible Systems ...........................11
5.2 Replacing the Oxygen Sensor Block ................11
5.2.1 Floating Ball System .............................11
5.2.2 Dip Systems .........................................11
5.2.3 Submersible Systems ...........................12
5.3 Changing the Temperature Compensator ........12
5.3.1 Floating Ball and Dip Systems ..............12
5.3.2 Submersible System .............................12
6 SPECIFICATION ........................................ 12
7 SPARE PARTS LIST ................................... 13
7.1 Floating Ball System .........................................13
7.2 Dip System .......................................................13
7.3 Submersible System .........................................13
CONVERSION .......................................... 14
A1 Kit Parts List ......................................................14
A2 Conversion Procedure .......................................14
Note. This dissolved oxygen sensor is an electrochemical
cell using lead based Chemistry. This ABB product in
alignment with the industry of medical devices and
monitoring and control instruments for dissolved oxygen
measurement under ROHS (Directive 2011/65/eu) are
exempted under Annex IV, part 1b for lead anodes in
electrochemical sensors. Under normal use, both lead and
its oxidised form, lead oxide, exist within the cell but pose
no risk in operation or when disposed in conjunction with
the disposal requirements of WEEE.
In
alignment
with
1907/2006) both lead (CAS 7439-92-1) and lead oxide
(CAS 1317-36-8) are identified on the candidate list.
1 INTRODUCTION
The ABB Model 9408 Floating Ball is a dissolved oxygen
measuring system primarily for use in sewage treatment
works where fouling of the dissolved oxygen sensor by rags
or other large solids is a common occurrence. To prevent this
contamination, a flat ended sensor is mounted inside a relatively
large diameter flotation collar, and therefore presents a surface
to the contaminant upon which it is almost impossible for the
contaminant to collect.
Two other systems are available:
• dip
• submersible
which are for use in open tanks and where access is difficult.
See below for a list of variations.
All measuring systems are compatible with the 4640 and 4645
dissolved oxygen transmitters.
A water wash option is available on all dissolved oxygen
systems described in this manual. Optional items are shown in
illustrations as dotted lines.
Information. To enable easy access to the floating ball
sensor a conversion kit is available which converts the
standard bracket into a swivel bracket - see appendix for
ordering and conversion information.
The following systems are currently available:
Floating Ball
Assembled
Standard ................................................................9408 700
With water wash ....................................................9408 702
Metric kit
Standard ................................................................9408 750
With water wash ....................................................9408 752
Imperial kit
Standard ................................................................9408 760
With water wash ....................................................9408 762
Dip
Assembled
Standard ..........................................................9408 710 (1 m)
With water wash ..............................................9408 712 (1 m)
Imperial kit
Standard ................................................................9408 771
With water wash ....................................................9408 773
Submersible
Standard ...................................................................9408 600
With water wash .......................................................9408 602
the
REACH
Regulation,
9408 720 (2 m)
9408 730 (3 m)
9408 722 (2 m)
9408 732 (3 m)
(EC
1
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