Hanna-instruments HI 98703 User Manual download pdf (Page 19)

MEASUREMENT PROCEDURE

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,

especially for low turbidity values (< 1

NTU) 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.

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.

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Hanna-instruments HI 98703 User Manual Page 19