Hf-scientific MicroTPW Field Portable Turbidimeters Manuale Utente Scaricare il pdf (Pagina 22)

MicroTPI & MicroTPW (5/10)

Rev. 1.9

9.0 Glossary

Formazin Nephelometric Units (FNU): Equivalent in value to Nephelometric Turbidity

Units (NTU)

Formazin Turbidity Units (FTU): Equivalent in value to Nephelometric Turbidity Units

(NTU)

Indexing a Cuvette: The United States Environmental Protection Agency (US EPA)

recommends that cuvettes, used for turbidimeter calibration or sample measurement, be

indexed. To index a cuvette with a sample in it, slowly rotate the cuvette throughout one

complete revolution (360°). While rotating the sample cuvette, observe the display and

locate the position that the cuvette is in, which provides the lowest turbidity reading.

This position is the indexed position of the cuvette.

Nephelometric Turbidity Units (NTU): Unit of measure used when relating the light

scattered by a liquid media to the light scattered by a known concentration of Formazin

Polymer. This unit of measure is recognized as a measure of the optical clarity of an

aqueous sample. NTU is the accepted unit of measurement for turbidity.

Turbidity: 1) A measure of the attenuation of a radiant flux as it passes through a liquid

media.

2) Optical clarity of a liquid.

3) A phenomena caused by the presence of undissolved matter in a liquid

media.

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Hf-scientific MicroTPW Field Portable Turbidimeters Manuale Utente Pagina 22