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When taking any turbidity measurements several basic rules should be followed:
• Use always cuvettes without scratches or cracks because they can cause inaccurate readings.
• Cap always the cuvettes to avoid spillage of the sample into the instrument.
• Close always the lid of the instrument during measurement.
• Keep the lid of the instrument closed when it is not used to prevent dust or dirt entering.
• Put always the instrument on a flat, rugged surface when taking measurements.
• Do not operate in direct sunlight.
• Do not use too much oil to prevent contamination of the optical system.
To take turbidity measurements, follow the next steps:
• Turn the instrument ON by pressing ON/OFF.
When dashes are displayed on the LCD, the
instrument is ready. On the secondary LCD the
current time appears, if selected in SETUP menu.
• Fill a clean, dry cuvette with 10 mL of sample up
to the mark, taking care to handle the cuvette
by the top.
• Replace the cap.
• Wipe the cuvette thoroughly with a lint‑free
cloth to remove any fingerprints, dirt or water
spots.
• Apply silicone oil on the cuvette and wipe with
a lint‑free cloth to obtain an even film over the
entire surface of the cuvette.
Note: It is very important to oil the cuvette, especial‑
ly for low turbidity values (< 1 FNU) to hide
the glass imperfections that can influence
the reading.
• Place the cuvette into the instrument. Align
the mark from the cuvette with the sign on the
instrument case and close the lid.
Note: If you have a cuvette with orientation mark,
place the cuvette into the instrument with
the orientation mark aligned with the sign
on the instrument top.
MEASUREMENT PROCEDURE
19
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