ABB Navigator 550 Quick Start Manual page 4

4 N AV I G AT O R 5 5 0 | LO W L E V E L D I S S O LV E D OX YG E N W E T S E C T I O N | I N F 1 3/ 1 2 4 - E N R E V. 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
connector body B .
4 Locate sensor
C onto connector body
and sockets are engaged correctly and tighten connector
nut D onto sensor C .
5 Insert the complete assembly into flowcell
larger of the 2 new O-rings
6 Screw in clamping screw
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.
A (3/4 in. ID) onto the
B , ensuring the pins
E , ensuring the
F (7/8 in. ID) is fitted.
G using finger-pressure only to
Note. Wet-section enclosure,
oxygen sensor container and
protective cap not shown for
clarity.
O-ring 7/8 in ID
O-ring 3/4 in ID
Optional flowmeter (if fitted)
Sensor shown
fitted
Figure 3 Fitting and connecting the dissolved
oxygen sensor at the flowcell
Pt1000 temperature
compensator
connector (blue)