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5. Turn the selector knob (No. 4) to the chloridize position and press the TIMER switch (No. 5).
The warning light will come on and remain on for about eight minutes while re-chloridization takes
place. During this period the cathode will turn from silver-white to a pale pink color which will
gradually darken as the layer of silver chloride builds up.
6. With de-chloridization of the cathode complete, disconnect the counter electrode and sensor, and
empty the solution from the regeneration cell.
7. Rinse the interior of the regeneration cell and sensor with water.
8. Based on the model used, remove or unscrew the regeneration cell from the sensor and rinse the
sensor head again with water.
Section 5 Circuit testing functions
This part of the manual describes a series of tests which will allow you to check if the electronics of
your sensor are functioning correctly.
The cause of such problems may be chemical, electronic or mechanical in origin. Since the tests
described here are logical, quick and simple to carry out, you can rapidly discover whether or not a
particular problem is of electronic origin or not.
If it is, then the tests allow you to localize the problem and report it to your Hach Lange
representative for repair. If it is not, then you know that the problem is of chemical or mechanical
origin and should act accordingly. Chemical problems may merely necessitate a very thorough
sensor service. Mechanical problems might take the form of poor connections on the inlet side of the
sample pipework.
For these tests it is not necessary to plug the sensor cleaning and regeneration center into the power
supply.
Please carry out the tests in the order in which they are presented here. Ignore any instructions
which do not apply to your system.
5.1 Preliminary checks
Power supply
Make sure that the voltage shown on the indicating instrument corresponds to the power supply.
Membrane
Refer to the user manual to determine which model number of membrane is required for the specific
sensor model.
LEMO connectors
Make sure that the LEMO connector of the sensor cable and, if applicable, the corresponding socket
of the indicating instrument are clean and dry and that the pins are undamaged.
Power supply circuit
If during the cleaning process the timer LED does not switch on, there is possible a fault in the power
supply circuit. Disconnect the instrument from the power supply and use an ohmmeter to measure
across the two live pins of the power plug. Contact technical support if a reading of infinity shows a
blown fuse.
5.2 Sensor testing
For sensor testing you will require an ohmmeter with leads ending in banana plugs suitable to be
plugged into the group of eleven sockets on the TEST panel of the sensor cleaning and regeneration
center. Two such banana plugs are supplied with each unit.
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