ABB Navigator 550 User manual

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ABB MEASUREMENT & ANALYTICS | INFORMATION | INF13/124-EN REV. B
Navigator 550
Low level dissolved oxygen wet-section
Sensor assembly spares
replacement procedures
Measurement made easy
1 Introduction
These procedures must be carried out by a trained
technician.
2 For more information
Further information is available from:
www.abb.com/analytical
or by scanning these codes:
Sales Service
Navigator 550
low level dissolved
oxygen wet-section

2NAVIGATOR 550 | LOW LEVEL DISSOLVED OXYGEN WET SECTION | INF13/124-EN REV. B
3 Safety
WARNING
These procedures must be carried out by a trained
technician.
ELECTRICAL
• Isolate all high voltage supplies to the transmitter before
performing replacement procedures.
• The wet-section is vulnerable to electrostatic damage.
Wear an anti-static strap or dismantle the wet-section on
an anti-static workbench.
• Ensure all electrical connections are kept dry at all times.
GENERAL
• Shut off the external sample supply to the wet-section
and drain the flowcell – refer to the wet-section Operating
instructions (OI/ADS550-EN) for flowcell drainage
options.
• When a procedure is complete, restore power to the
transmitter and sample to the wet-section at the correct
flow rate.
• If necessary, calibrate the wet-section – refer to the wet-
section Operating Instructions (OI/ADS550-EN) for
calibration instructions.
• Perform general cleaning of the wet-section using a damp
cloth only – mild detergent can be used as a cleaning aid.
Do not use Acetone or any organic solvents.
• Dispose of the old components in accordance with the
guidelines contained in the Operating instructions
(OI/ADS550-EN).
4 Disposal
WARNING
Dispose of the old components in accordance with the
guidelines contained in the Operating instructions
(OI/ADS550-EN).
5 Dissolved oxygen sensor
assembly location
Sensor contained
within flowcell
Figure 1 Low level dissolved oxygen sensor location

NAVIGATOR 550 | LOW LEVEL DISSOLVED OXYGEN WET SECTION | INF13/124-EN REV. B 3
6 Replacing the dissolved
oxygen sensor
Part number: low level dissolved oxygen sensor assembly
(AW502 080)
Removing the dissolved oxygen sensor
assembly
Referring to Figure 2:
1 Disconnect (red) sensor connector A.
2 Unscrew clamping screw Band withdraw the sensor
assembly from flowcell body C.
3 Carefully unscrew connector nut Gfrom sensor Dand
withdraw connector body E.
4 Remove and discard O-rings Fand H.
Figure 2 Removing the dissolved oxygen sensor assembly

4NAVIGATOR 550 | LOW LEVEL DISSOLVED OXYGEN WET SECTION | INF13/124-EN REV. B
…6 Replacing the dissolved oxygen sensor
Fitting a new dissolved oxygen sensor assembly
CAUTION
• Only install the sensor immediately prior to use. The
sensor has a limited shelf life and, ideally, should NOT be
stored longer than 6 months. Store under cool conditions.
• Take special care to line up the two pins in the sensor with
their respective sockets before making the connection
and tightening.
• Take care not to damage the delicate membrane on the
face of the sensor.
• Ensure that the mating surfaces (carrying the electrical
connection) of the sensor and connector body are clean
and completely dry.
• Do not overtighten the clamping screw.
1 Remove the top from the new sensor container.
2 Unscrew the protective cap from the rear of the sensor.
Referring to Figure 3:
3 Fit the smaller of the 2 new O-rings A(¾ in. ID) onto the
connector body B.
4 Locate sensor Conto connector body B, ensuring the pins
and sockets are engaged correctly and tighten connector
nut D onto sensor C.
5 Insert the complete assembly into flowcell E, ensuring the
larger of the 2 new O-rings F ( in. ID) is fitted.
6 Screw in clamping screw Gusing finger-pressure only to
secure the dissolved oxygen sensor assembly in the flowcell
body.
7 Push (red) sensor connector H onto sensor connector block I
firmly and tighten ONE TURN clockwise.
Note. Wet-section enclosure,
oxygen sensor container and
protective cap not shown for
clarity.
Pt1000 temperature
compensator
connector (blue)
Sensor shown
fitted
Optional flowmeter (if fitted)
O-ring  in ID
O-ring ¾ in ID
Figure 3 Fitting and connecting the dissolved
oxygen sensor at the flowcell

NAVIGATOR 550 | LOW LEVEL DISSOLVED OXYGEN WET SECTION | INF13/124-EN REV. B 5
Notes

6NAVIGATOR 550 | LOW LEVEL DISSOLVED OXYGEN WET SECTION | INF13/124-EN REV. B
…Notes

NAVIGATOR 550 | LOW LEVEL DISSOLVED OXYGEN WET SECTION | INF13/124-EN REV. B 7

INF13/124-EN Rev. B 11.2019
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We reserve the right to make technical changes or modify the contents of this document
without prior notice. With regard to purchase orders, the agreed particulars shall prevail.
ABB does not accept any responsibility whatsoever for potential errors or possible lack of
information in this document.
We reserve all rights 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 2019
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