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...6 MAINTENANCE
6.4 Replacing the Emitter and Receiver Modules
Having replaced the emitter/receiver module(s) (procedure in
Section 6.4.1) it will be necessary to adjust the emitter
brightness (procedure in Section 6.4.2).
Please observe all Warnings, Cautions and Notes in Section
6.2.2.
6.4.1 Changing the Modules
1) Electrically isolate the equipment.
2) Disconnect the receiver and/or emitter wires at the
receiver/emitter.
3) Follow the procedures in Fig. 6.1 (Low Ranger Sensor)
and/or Fig. 6.2 (High Range Sensor) for removing the
modules.
4) Check that the 'O' ring is fitted to the new emitter/receiver.
5) Insert the emitter/receiver modules into the flowcell; rotate
them to align with internal keys before tightening the
collars.
6) Connect the appropriate wires the emitter/receiver (see
Fig. 3.3).
7) Switch on the mains supply and allow the instrument to
warm up for five minutes.
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6.4.2 Adjusting the Emitter Brightness
1) Fill the flowcell with high purity water.
2) Enter the Factory Programming Page (see overpage)
using the security code 73. If this has been changed at any
time, use 7300.
3) Scroll to Interrogate Display.
4) Remove the small plug on the left hand side of the emitter.
Inside is a multi-turn potentiometer which may be adjusted
using a small bladed screwdriver.
5) Bearing in mind that the display updates every six
seconds, adjust the brightness control so that a Signal
Total Value of '3900' ±300 is displayed.
6) Check that the two Peak values are between 50 and 62;
otherwise contact Stonehouse.
7) When adjusted correctly, fit the plug into the body of the
receiver.
8) Carry out a calibration (see Section 5.3).
9) Return the instrument to normal operation (see Section
5.2).
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