Turbidity meter
Turbidity meters are measuring devices , they determine the proportion of particulate solids in a liquid . This measurement is, for example, part of the investigation within the scope of the Drinking Water Ordinance , or also in beer production to measure the amount of yeast or in milk in dairies. These devices are available either as inline devices for installation in pipeline systems or as stand-alone devices. Most of these devices are provided with a strong optical light source that z. B. the infrared light of a tungsten filament or laser light is used to irradiate the liquid to be examined. This structure also gives the limits of usability. Modern measuring systems work more and more with LEDs as light sources. The devices do not measure the absorption of radiation across the spectrum of different wavelengths, as spectrometers do, but rather the attenuation of the light intensity as a whole through the formation of scattered light and absorption. Turbidity meters are the subject of photometry . The accuracy of the devices can be increased by using a two-beam measurement method, i.e. a method in which two detectors and a semi-transparent mirror are used, compared to the more cost-effective single-beam method.
See also
Web links
- Basics of turbidity measurement, turbidity in beer
- Turbidity measurement in beer ( Memento from May 8, 2015 in the Internet Archive )
Individual evidence
- ↑ Johannes Krückeberg: High-performance LEDs in practice, Franzis Electronics 2007