ANDERSON-NEGELE TURBIDITY MEASUREMENT - RELIABLE AND COST-EFFECTIVE
Turbidity refers to an optical phenomenon caused by the scattering of light on undissolved particles in a fluid. When a ray of light impinges on a particle, a portion of the light is reflected and a portion is absorbed. Depending on the shape and the surface properties of the particle, light of varying intensity is scattered in all directions.
In process engineering, turbidity measurement has become indispensable for the automation of process flows. By offering a variety of different measurement techniques, Anderson-Negele has a solution for virtually every application.
BACKSCATTER METHODTurbidity measurement with ITM-3 in pipes of DN25 and larger, for media with a minimum turbidity of 2000 NTU. Application: Phase separation of products (e.g., whey - cream - milk), CIP return flow (monitoring of pre-rinse water for product remnants), "yeast harvest" in breweries. Measuring principle: A diode radiates infrared light into the medium. The particles in the medium reflect back the radiated light, which is detected by the receiver diode. The electronics calculate the turbidity of the medium based on the strength of the received signal.
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4-BEAM ALTERNATING LIGHT METHODTurbidity measurement with ITM-4 in pipes of DN40 and larger, for media with very low turbidity up to a max. of 5000 NTU or 1250 EBC. Application: Filtrate monitoring, phase separation of slightly turbid media, quality control. Measuring principle: Two transmitters and receivers measure transmitted light and 90° scattered light; the turbidity is then calculated by forming a quotient that takes into consideration the value calculated last, a method described in DIN/EN 27027 (ISO 7027).
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TRANSMITTED LIGHT METHODTurbidity measurement with ITM in pipes of DN40 and larger, for media with medium to high turbidity. Application: Quality control, phase separation of products, CIP return flow. Measuring principle: A diode radiates infrared light toward a receiver on the opposite side. The receiver current is kept constant by adjusting the radiation power. The higher the turbidity, the greater the radiation power. |
