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MEASUREMENT PROCEDURE
TURBIDITY MEASUREMENTS
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. The current time appears on
the secondary LCD, if selected in SETUP menu or
“turb” if the time is not displayed.
• Fill a clean, dry cuvet with 10 mL of sample up to the
mark, taking care to handle the cuvet by the top.
• Replace the cap.
• Wipe the cuvet thoroughly with a lint-free cloth
to remove any fingerprints, dirt or water spots.
• Apply silicone oil on the cuvet and wipe with a
lint-free cloth to obtain an even film over the
entire surface of the cuvet.
Note: It is very important to oil the cuvet, espe-
cially for low turbidity values (< 1 NTU)
to hide the glass imperfections which can
influence the reading.
• Place the cuvet into the instrument. Align the
mark from the cuvet with the sign on the
instrument top and close the lid.
Note: If you have a cuvet with orientation mark,
place the cuvet into the instrument with the
orientation mark aligned with the sign on
the instrument top.
When taking turbidity, free or total chlorine measurements, several basic rules should be followed:
• Always use cuvets without scratches or cracks because they can cause inaccurate readings.
• Always cap the cuvets to avoid spillage of the sample into the instrument.
• Always close 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.
• Always put 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 (for turbidimeter range only).
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