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Novomatics Manual
15.
Photocell cleaning instructions
15.1. Inspection of photocell operation
When a clear sample inserted the photo cell signal has to 1000 or higher. When lower a warning
appears at start of next measurement and it is recommended to clean up the photocell
according next chapter.
Figure 16 The white rectangle shows photo cell signal on right side of Online Window
15.2. Photocell cleaning procedure
For cleaning the photocell system it is not necessary to dismantle the instrument. By means of
the cleaning brush and solvent (Isopropanol Alcohol) supplied with the instrument, direct
cleaning is possible in a few minutes.
a)
Check the light transmission value according to the previous chapter.
b)
Wet the cleaning brush with some solvent, insert it and move it up and downwards to
clean the photosensitive areas in the test tube cylinder.
c)
Insert a clean glass test tube filled with clear water or solvent into the instrument and
check the intensity of the photocell again. The measured value should be over 300 units.
If not, please repeat the cleaning procedure.
d)
Re-calibrate the turbidity measurement according to the calibration instructions
Note:
As a precautionary measure, the cleaning may be done on a day by day basis in order to
prevent that dust and dirt will stick on the sensitive tip of the optical glass fibres.
Turbitronic P
27
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