wtw Turb 555 Operating Manual page 22

Operation
Measuring units
Turb 555
Measuring units
Turb 555 IR
22
You can select the following measuring units (see section
4.5.2 S ):
ETTINGS
NTU = Nephelometric Turbidity Units (90°scattered light
measurement). Nephelometric turbidity unit according to
section 2130 of the "Standard Methods for the Examina-
tion of Water and Wastewater", 19th edition.
EBC = European Brewery Commission (90°scattered
light measurement). Nephelometric turbidity unit, used by
the European Brewery Commission
(Conversion: 0.245 EBC = 1 NTU).
NEPHELO (90°scattered light measurement)
Nephelometric turbidity unit, used in microbiological
research (Conversion: 6.7 Nephelo = 1 NTU).
NTU = Nephelometric Turbidity Units (90°scattered light
measurement). Nephelometric turbidity unit according to
section 2130 of the "Standard Methods for the Examina-
tion of Water and Wastewater", 19th edition.
FNU = Formazin Nephelometric Units (90°scattered light
measurement). Nephelometric turbidity unit. This unit is
only applicable if the instrument is calibrated with formaz-
in standards. It is used for measurements according to
DIN 27027 / ISO 7027 (Conversion: 1 FNU = 1 NTU).
EBC = European Brewery Commission (90°scattered
light measurement). Nephelometric turbidity unit, used by
the European Brewery Commission
(Conversion: 0.245 EBC = 1 NTU).
FAU = Formazin Attenuation Units (transmission mea-
surement). Formazin attenuation unit for measurements
according to DIN 27027 / ISO 7027 over 40 FNU.
Turb 555 / Turb 555 IR
ba41113e07 04/2009