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63
Maintenance and service
Check Start/Stop Input Contact
After the 10th actuation of the "Start" key, the input contact is
tested.
•
The black wires 1 and 2 of the input contact are bridged and
opened. The input contact can be checked at the indicator LEDs.
Input contact open
Input contact bridged
Measure the zero value of the water sample
This test step is necessary to determine the zero value of the sample for the following
colour detection test.
After pressing the "Start" key for the 11th time, the zero value of
the optical path is measured with a colourless water sample.
•
The last 3 LEDs flash.
•
For testing the measuring section, the measuring chamber must
be filled with clear water. Press and hold the "Valve" button until
the solenoid valve opens, and the measuring chamber is flushed.
Colour recognition test
After pressing the "Start" key for the 12th time, the colour
recognition of the optical path is checked.
•
The last 3 LEDs light up.
The first LED signals whether the measured value is below or
above the limit value.
•
No display
There is no coloured water sample available
•
Green:
Measured value below the limit value
•
Red:
Measured value above the limit value
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