Nephelometric Turbidity Unit
5, 50 and 500 NTU samples
The Nephelometric Turbidity Unit ( nephelometric turbidity value ; NTU) is in the water treatment used unit for the turbidity of liquids . It is the unit of the turbidity of a liquid measured with a calibrated nephelometer .
More units
The unit NTU is more common in the US . The limit value for the turbidity of drinking water there and in the Federal Republic of Germany is 1 NTU. In the Federal Republic of Germany, the unit TE / F (turbidity unit / formazin) is common (the unit NTU is used in the 2001 Drinking Water Ordinance).
The international turbidity standard is the chemical formazin , which forms particles of different sizes in water. Units derived from this are:
- In brewing :
- In water treatment ( ISO 7027)
- FAU ( Formazine Attenuation Units )
- FNU (Formazine Nephelometric Units)
- FTU (Formazine Turbidity Unit)
- NTU (Nephelometric Turbidity Unit)
- TE / F (turbidity unit / formazin)
conversion
| 1 EBC | 1 FNU 1 NTU 1 FTU 1 FAU |
1 ASBC | |
|---|---|---|---|
| 1 | 0.25 | 0.014 | EBC |
| 4th | 1 | 0.057 | FNU NTU FTU FAU |
| 70 | 17.5 | 1 | ASBC |