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Turbidity Meter The Reliability Of The Test Results
Jul 20, 2017

Turbidity Meter sensor daily maintenance

1, if installed outside, please check the transmitter installation box is leaking phenomenon;

2, check the working environment, if the transmitter temperature beyond the stable working range, to take appropriate measures in time, otherwise it will damage or reduce its service life;

3, clean the transmitter plastic shell, please use a soft cloth and soft detergent to clean the shell, be careful not to let the moisture into the transmitter inside;

4, check the transmitter screen display data is normal;

5. Check that the wiring on the transmitter terminals is secure. Be sure to disconnect the 220V AC power before removing the terminal cover.

Turbidity analyzer built-in microprocessor, equipped with advanced, powerful, is a very sophisticated turbidity meter, based on 880nm infrared light source through the optical lens and penetrate the sample solution, according to ISO7072 standard 90 ° direction of scattered light principle , This turbidity analyzer can be used in different parts of the filter device to measure raw water or pure water turbidity, such as drinking water, a variety of production and industrial water, and any need to use qualified water. Compact product structure, built-in backlight LCD screen, data memory, relay control output (3). The turbidity controller outputs 4 to 20 mA isolation signals to deliver reliable data for any location where monitoring and control of turbidity are required.

A Turbidity Meter is an instrument used to measure the extent of scattering or attenuation of light produced by insoluble particulate matter suspended in water (or other transparent liquids) and to quantitatively characterize the contents of these suspended particulate matter. Commonly used photoelectric turbidity meter mainly by the light source, light collimation system, sample measurement pool, measuring room, photoelectric detection components and display systems and other components. According to the measurement principle or way can be divided into light transmission attenuation, light scattering, scattering transmission and integrating sphere less seven ways.

According to the national measurement procedures JJG requirements on the appearance of the turbidity meter, insulation resistance, instrument zero drift, instrument indication stability, instrument indication repeatability and instrument indication error test. The condition of the test is to require the identity, reproducibility and stability of the basic standard solution in optical properties. Therefore, the basic standard solution to meet the standard requirements, directly determine the reliability of the test results. Standard solution preparation and improper use, is the main cause of the error of the test. Therefore, in the verification work should pay attention to the following two points:

STZ-A81 online turbidity meter

1. Can not use distilled water instead of zero turbidity water

Some units use distilled water to adjust the zero point of the turbidity meter and to dilute the turbidity standard. In fact, the turbidity of distilled water is not zero, instead of zero turbidity water with distilled water will cause some errors in the test results, especially for the measurement of low turbidity greater impact. Therefore, must be strictly in accordance with the requirements of the verification procedures, with a hole value of not more than 0.2} m microporous membrane filtration of distilled water (or electrodialysis water, ion exchange water)) more than 2 times to obtain the test with the zero turbidity water.

2. The standard solution must be stored and used properly

The Fulmar Trap Polymer Suspension is the most commonly used turbidity standard for the world's water quality measurement. It is made of S.OmL (containing O.OOSg) sulfuric acid umbilical and O.SmL (containing O.OOSg) hexamethylenetetramine solution, and then placed at (25 ± 3) 0C for 24 h, after polycondensation reaction The The formalin standard is formed by the use of pure chemical reagents under tightly controlled conditions, reproducibility (individual multiple formulation) and reproducibility (different operators, different times, different locations) The material is the same material, the optical properties of the same and constant, is the ideal turbidity standard solution. The standard solution used in the laboratory is generally purchased from the National Standard Material Research Center. This standard solution in a long time after the preservation of its turbidity will be a certain decline. The degree of turbidity reduction with glass containers is lower than that of plastic containers. The lower the turbidity of the standard solution, the higher the storage temperature, the greater the effect. Therefore, the low turbidity standard solution is preferably stored in a glass container. It is most suitable for cold storage in a glass container below 10 ° C. This ensures that the turbidity does not change for a long period of time. Room temperature preservation, should be based on the level of room temperature, to determine the appropriate storage time of the longest time. When the standard solution is used, it should be shaken.

In addition, since the photoelectric detection element is sensitive to the temperature change and the power supply, the temperature, humidity and the supply voltage of the environment should be controlled in the verification to reduce the error caused by the external environment.