PART FOUR - SERVICE AND MAINTENANCE
SECTION 1 - GENERAL INFORMATION
Rev. 2-300
Accu4™ Low-range Turbidimeter System
83
1.3 Replacing Sensor
Light Source or
Detector
Removing
Inoperative Part
☞
☞
Installing
New Part
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When the TEST/MAINT “STATUS: SOURCE 1 (or 2)”
screen or “STATUS: DETECT 1 (or 2)” screen indicates
“FAIL,” the respective sensor LED light source or detector
may be disconnected, incorrectly wired, or inoperative.
1.
Open the Model 8320 sensor enclosure door to access
the inoperative light source or detector.
2.
After draining the sensor, remove the flow chamber
cover by turning it 1/8 turn counterclockwise to disen-
gage its four tabs, and lift it straight off the chamber.
NOTE:
For high pressure design sensor (Figure 4-2),
remove the flow chamber cover lockring and
window by unscrewing the lockring counter-
clockwise.
3.
Remove the black retainer clip from its slot in the flow
chamber.
4.
Extract the inoperative light source or detector from its
receptacle.
NOTE:
Extraction may be difficult because light sources
and detectors have double O-ring seals. To ease
removal, grasp the component by hand and twist
it back and forth while extracting it.
5. Disconnect the wires of the inoperative light source or
detector from the sensor terminal board.
# - - - - - # - - - - - #
1.
Carefully replace the new light source or detector as-
sembly into its receptacle. Refer to Part Five -- Spare
Parts -- for the GLI assembly part numbers.
NOTE:
Lubricate O-rings with the lubricant supplied to
help ease the component into place. Make sure
the light source or detector is fully inserted.
2.
Replace the black retainer clip to secure the new light
source or detector.
3.
Refer to Figure 4-3 and connect its wires, by color, to
the sensor terminal board.
