14
GENERAL TIPS FOR ACCURA
TE MEASUREMENTS
Warning:
Do not apply the oil in excess, it may retain dirt or contaminate the cuvette holder of
the instrument and alter the turbidity readings.
To correctly oil a cuvette:
1. Apply a few drops of oil.
2. Wipe the cuvette thoroughly with a lint-free cloth.
3. Wipe off the excess oil until a thin, uniform layer is obtained.
Note:
The supplied cloth should be stored together with the silicone oil bottle and cuvettes,
taking care to avoid contamination with dirt. After a few oiling procedures the cloth will contain
enough oil to wipe the bottle without adding more oil. From time to time add a few drops of oil
on the cuvette to provide the necessary oil quantity on the cloth.
Indexing a Cuvette
For low turbidity readings always insert the cuvette into the instrument in the same position.
All cuvettes are factory indexed. This index should be used to position the cuvette with the factory mark
aligned with the mark on top of the instrument.
To further reduce the effect of glass imperfections, the cuvette can be indexed. For indexing a cuvette
or matching multiple cuvettes, enter continuous reading mode.
When in continuous reading mode, keep READ
pressed for successive readings to be taken
without turning the LED off. After a first reading has been taken, unscrew the cuvette cap and rotate
the cuvette without generating an error. The turbidity value is displayed and the LED turns off after
READ
is released.
Note:
The instrument can not perform continuous readings in average mode.
For a correct indexing:
1. Fill the cuvette with high-quality water (<0.1 FNU) up to the line.
2. Clean and oil the cuvette.
3. Turn the instrument ON.
4. Insert the cuvette into the instrument and press READ
. Record the reading.
5. Open the lid, slightly rotate the cuvette and take a new reading. Repeat this step until the lowest
FNU value is read.
Alternatively, keep READ
pressed and, after the first read value is displayed, open the lid and
start rotating the cuvette until the lowest FNU value is displayed.
