- Standard No.
- EN ISO 7027-1:2016
- Release Date
- 2016
- Published By
- European Committee for Standardization (CEN)
- Latest
-
EN ISO 7027-1:2016
- Replace
-
FprEN ISO 7027-1:2016
- Scope
- This part of ISO 7027 specifies two quantitative methods using optical turbidity meters or nephelometers to determine the turbidity of water: a) Nephelometry: Method for measuring radiation scattered from particles (scattered radiation), applicable to water with low turbidity (e.g . Drinking water); b) Turbidimetry: Method for measuring the attenuation of transmitted radiation. They are more suitable for very cloudy water (e.g. sewage or water containing suspended matter). Turbidities measured using the first method are reported in nephelometric turbidity units (NTU). Results typically range between <0.05 NTU and 400 NTU. Depending on the device design, more cloudy water can also be measured. There is a numerical equality between the NTU and formazine nephelometric units (FNU). Turbidities measured by the second method are reported in formazin attenuation units (FAU); the results are typically between 40 FAU and 4000 FAU.
EN ISO 7027-1:2016 Referenced Document
- CIE S 017-2011
- ISO 3864-1:2011 Graphical symbols - Safety colours and safety signs - Part 1: Design principles for safety signs and safety markings
- ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results - Part 1: General principles and definitions
- ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
EN ISO 7027-1:2016 history
- 2016 EN ISO 7027-1:2016 Water quality - Determination of turbidity - Part 1: Quantitative methods
EN ISO 7027-1:2016 Water quality - Determination of turbidity - Part 1: Quantitative methods has been changed from EN ISO 7027:1999 Water Quality - Determination of Turbidity ISO 7027:1999; Supersedes EN 27027:1999.