WTW - a xylem brand articles

Applications
The application areas of the new color sensors are monitoring in the outlet of the sewage treatment plant and monitoring of surface waters  .

Methods
The sensors measure according to the method DIN EN ISO 7887:2011, method C and according to the method APHA 2120 2018 (Hazen), method C. In both cases, these are methods for measureme

What does RoHS mean?

RoHS is the abbreviation for „Restriction of the use of certain Hazardous Substances in electrical and electronic equipment”. The abbreviation refers to the so called RoHS directive 2011/65/EU, which forms the legal framework. The goals of the regulation are the protection of human health and of the environment.1) The directive is applicable for the EU and Switzerland.

What are the hazardous substanc

This article was featured in International Labmate - July 2008

Turbidity measurement represents a method appearing quite simple with a very complex background. Its complexity is shown by the fact that possibilities for objective and reproducible measurements were developed just about in the 2nd half of the 20th century. Turbidity is caused by dispersion of undissolved particles varying in size and form being suspended in the solution. The greatest challenge for c

This article was featured in Lab Asia - July/August 2008

Turbidity can be described only with limitations as a physical and technical measurement category. The unusual nature of the turbidity measurement in comparison to other parameters can be recognised already in its historical development: Initially a procedure was introduced by Jackson and Whipple around 1900 determining turbidity by means of candlelight under a glass tube. Dilution series of diatomaceous earth (