1、 Total phosphorus online analyzerTresCon P511

（1） Measurement principle

The total phosphorus online analyzer consists of two modules. High temperature chemical digestion module, used to heat and digest samples; Analysis module, used to test phosphate concentration. During the digestion process, all valence states of phosphorus compounds are converted into orthophosphate that can be analyzed by photometry. The reaction is based on the oxidation of other valence states of phosphorus to orthophosphate by persulfate under acidic conditionsPO₄^3-High temperature and high pressure conditions can greatly shorten the digestion time. Use molybdenum blue colorimetric method to test the concentration of orthophosphate: add molybdate to the sample, react chemically to make the sample blue, use a photometer to detect the color change, and then convert it into concentration. The entire process is carried out in an orderly manner under the control of the controller, thus ensuring high operational safety. This method complies with national standardsGB 11893-89.

（2） Typical Applications

Monitoring of sewage treatment plant inlet and outlet, drinking water, and surface water.

（3） Advantages and Characteristics

1、 Automatic calibration, automatic cleaning

2、 Reagents are non-toxic and harmless

3、 Automatic temperature control function: capable of automatically adjusting the temperature of the sample

4、 Automatic flow control function: sensing pipeline blockage, leakage, and sample liquid level height through pressure sensing

5、 Automatic reading function: Evaluate the stability of test values

6、 Automatic adjustment of measurement interval function: Adjust according to changes in concentration to save reagent usage

7、 Comes with a refrigerator to prevent reagent spoilage

8、 Molybdenum blue colorimetric method ensures accurate data even at low concentrations

9、 Multiple temperature and testing time options,10Test one sample per minute

10、AutoKorr(Automatic Color Compensation): Background calculation to eliminate turbidity and color interference

(IV)Technical indicators

2、 Orthophosphate online analyzerTCU/P211

（1） Measurement principle

Using molybdenum–Vanadate standard addition colorimetric method. Add indicator and solution to the sample during testingPO₄^3- A chemical reaction occurs to form a yellow solution. The amount of color change is proportional to the orthophosphate in the solution. The amount of color change is detected using a photometer and converted to concentration using the reference beam method. This dual wavelength testing process, combined with a unique background value correction function, enables the instrument to automatically eliminate the effects of chromaticity and environmental changes around the flow cell. Practice has proven that even if the chromaticity of the sample is large, the testing error will not exceed1%.

（2） Typical Applications

Chemical phosphorus removal process control and monitoring, biological phosphorus removal process monitoring, natural water phosphorus pollution monitoring, drinking water monitoring.

（3） Advantages and Characteristics

1、 Automatic background compensation

2、 continuous/Non continuous testing

3、 Three types of instruments with different ranges are available for selection

（4） Technical indicators