ABB AV410 - Replacing the Emitter and Receiver Modules; Adjusting the Emitter Brightness

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8 SENSOR MAINTENANCE
8.3 Replacing the Emitter and Receiver Modules
Notes.
• The emitter and receiver modules are matched
during manufacture. If either module fails, return
both to the Company for repair/replacement.
• Refer to the Warnings and Notes in Sections 8.1 and
8.2.1 before removing the modules from the flowcell.
• Under NO circumstances dismantle the modules.
1) Isolate the system from the power supply.
2) Disconnect the cables from the emitter and receiver
modules.
3) Refer to Fig. 8.1 (7320 100 Low Ranger Sensor) or Fig. 8.2
(7320 200 High Range Sensor) and remove the emitter and
receiver modules.
4) Refer to Fig. 8.1 (7320 100 Low Ranger Sensor) or Fig. 8.2
(7320 200 High Range Sensor) and fit the new modules.
5) Refer to Fig. 6.11 and reconnect the emitter and receiver
cables.
6) Restore the power supply to the system and allow to warm
up for five minutes.
7) Adjust the emitter brightness – see Section 8.4.
8.4. Adjusting the Emitter Brightness
1) Fill the flowcell with high purity water.
2) Select the
TEST/MAINTENANCE Page (see Section 5.9).
3) Scroll to the
Org. Totals frame (page 28) for the relevant
sensor.
4) Remove the small plug on the left hand side of the emitter
module.
5) Using a long, small-bladed screwdriver, adjust the multi-turn
potentiometer until
Span A (or Span B) value reads 100 ±10.
Note. If this value cannot be obtained, contact the
Company.
6) Check that the Span A values in the Org. Peak and Ref. Peak
frames are between 200 and 250.
Note. If these values are outside the limits, contact the
Company.
7) Refit the plug removed at step 4.
8) Calibrate the sensor – see Section 4.2.
9) Return the system to normal operation.