Technical article on turbidity meter
Due to the presence of suspended and colloidal particles in water, the originally colorless and transparent water becomes turbid, and the degree of turbidity is called turbidity. The unit of turbidity is expressed in degrees, which is equivalent to the turbidity level of 1 degree, also known as Jackson, when 1 liter of water contains 1mg of SiO (or mg of kaolin or diatomaceous earth). The turbidity unit is JTU, and 1JTU=1mg/L for white clay suspension. The turbidity displayed by modern instruments is the scattered turbidity unit NTU, also known as TU. 1TU=1JTU. Recently, internationally, it is believed that,The turbidity standard prepared with hydrazine sulfate has good reproducibility and is selected as the unified standard FTU for various countries. 1FTU＝1JTU。 Turbidity is an optical effect that represents the degree to which light is obstructed when passing through a water layer, indicating the ability of the water layer to scatter and absorb light. It is not only related to the content of suspended solids, but also to the composition, particle size, shape, and surface reflectivity of impurities in water.
Controlling turbidity is an important aspect of industrial water treatment and a crucial water quality indicator. According to the different uses of water, there are different requirements for turbidity, and the turbidity of drinking water should not exceed5 degrees; The turbidity of the supplementary water for circulating cooling water treatment is required to be between 2 and 5 degrees; The turbidity of the influent (raw water) treated with desalinated water should be less than 3 degrees; The manufacturing of artificial fibers requires a water turbidity of less than 0.3 degrees. Due to the fact that suspended and colloidal particles that constitute turbidity are generally stable and mostly carry negative charges, they will not settle without chemical treatment. In industrial water treatment, coagulation, clarification, and filtration are mainly used to reduce the turbidity of water.
The DZ series turbidity meter adopts a dual beam optical path with two highly symmetrical optical and electrical channels, which generate the same induction, maintain the same measurement difference, and can be cancelled out in the division circuit, making the instrument have long-term stability and anti-interferencepower; Using a linearization circuit to display the measurement results linearly; The use of temperature compensation, analog division function and other circuits, as well as specialized technologies such as noise elimination, ensures the high sensitivity and excellent reproducibility of the instrument.