LaMotte LTC3000wi Turbidity & Chlorine Lab Meter - Manual (Page 15)

Acronyms Defi nitions Notes
Regulatory
Method
NTU Nephelometric
Turbidity Units
Incandescent white
light between 400 and
600 nm, 90° detection,
LTC3000we
EPA 180.1
FNU Formazin
Nephelometric
Units
IR LED (usually) 860
nm, bandwidth less than
60 nm, 90° detection,
LTC3000wi
ISO 7027
AU Attenuation
Units
Incandescent white
light between 400 and
600 nm, 180° detection,
LTC3000we
Not
applicable
FAU Formazin
Attenuation
Units
IR LED (usually) 860
nm, bandwidth less than
60 nm, 180° detection,
LTC3000wi
ISO 7027
ASBC American
Society of
Brewing
Chemists
LTC3000we/wi Not
applicable
EBC European
Brewery
Convention
LTC3000we/wi Not
applicable
The LTC3000we and LTC3000wi each use two turbidity units. The
LTC3000we reports the result as NTU when the 90° detector is used and
AU when the 180° detector is used. The LTC3000wi reports the result as
FNU when the 90° detector is used and FAU when the 180° detector is
used.
TAKING TURBIDITY WATER SAMPLES
Clean plastic or glass containers may be used for turbidity samples.
Ideally, samples should be tested soon after collection and at the same
temperature as when collected.
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