This outdoor small-scale automatic water quality monitoring station adopts an integrated design principle, including a water sampling and distribution system, a detection unit (five measurement modules for total phosphorus, total nitrogen, permanganate index, ammonia nitrogen, and conventional five parameters), a quality control unit, and an auxiliary unit (waste liquid collection, lightning protection, air conditioning, etc.). Among them, the core unit is the detection unit. The total phosphorus, total nitrogen, permanganate index, and ammonia nitrogen strictly follow the chemical analysis methods stipulated in the national standards. The conventional five parameters (dissolved oxygen, electrical conductivity, turbidity, temperature, and pH) are measured using a multi-electrode integrated method.

This automatic monitor adopts the parallel principle of two channels with multiple channels to achieve the switching of the flow paths for the two measurement processes of chloride and sulfate.
Chloride: Silver ions react with the dia-methylanilinoazobenzene rhodanine under the presence of surfactant sodium dodecyl sulfate and dispersant polyethylene glycol hydroxyethyl to form a ternary complex. This complex has the maximum absorption at a specific wavelength, and its absorbance is proportional to the concentration, which conforms to Lambert-Beer's law.
Sulfate: Sulfate and barium ions in water form fine suspensions, making the solution turbid. The turbidity degree is proportional to the content of sulfate in the sample. By measuring the absorbance of the sulfate suspension, the content of sulfate can be calculated using the calibration curve.

This automatic monitoring instrument adopts the principle of parallel connection of two channels of valves to achieve the switching of the flow paths for the two measurement processes of ammonia nitrogen and total phosphorus.
1. In the presence of alkaline medium and nitroferrocyanide, ammonia and ammonium ions in water react with salicylate and hypochlorite ions to form a blue compound, which has the maximum absorbance at a specific wavelength, thereby determining the content of ammonia nitrogen in water.
2. In neutral conditions, potassium persulfate is used to digest the sample, and all the phosphorus in it is oxidized to orthophosphate. In acidic medium, orthophosphate reacts with ammonium molybdate, and after reacting with antiradical acid, it forms a phosphomolybdenum heteropoly acid, which is immediately reduced to a blue complex at a specific wavelength, and is then determined by spectrophotometry and converted into total phosphorus value.

The multi-parameter water quality analyzer can integrate multiple water quality sensors. It is small in size, highly integrated, and easy to install and maintain. It is equipped with default monitoring parameters such as pH value, residual chlorine, total dissolved solids (TDS), turbidity, and temperature. According to actual needs, electrode parameters such as oxidation-reduction potential (ORP) and dissolved oxygen (DO) can be added. The measurement results are transmitted to the user's data center via the MODBUS RTU protocol.

In an acetic acid buffer medium with a certain pH value, fluoride reacts with the fluoride reagent and lanthanum nitrate to form a blue ternary complex. Within a certain range, the absorbance of the complex at a specific wavelength is proportional to the fluoride ion concentration, which conforms to Lambert-Beer's law. Thus, the fluoride can be quantitatively determined.

When the fluoride electrode comes into contact with the fluoride-containing solution, the electromotive force E of the battery changes with the variation of the fluoride ion activity in the solution, following the Nernst equation.

Add potassium permanganate and sulfuric acid to the sample, heat it to 98°C. Potassium permanganate will oxidize certain organic and inorganic reducing substances in the sample. Then, add an excess amount of sodium oxalate to consume the unreacted potassium permanganate. Next, use potassium permanganate for back-titration of the excess sodium oxalate. Record the volume at the titration endpoint and calculate to obtain the permanganate index value of the sample.

The water sample is drawn into the distillation chamber of the distillation base through the pre-treatment pipeline. Under constant temperature heating conditions, the volatile phenols in the water sample are distilled and condensed into the volumetric flask as water vapor, and the sample is fixed to a fixed volume by the volumetric module. The sample extracted by the base is then transferred to the colorimetric cell for colorimetric analysis.

Sulfates and barium ions in the water form fine suspensions, causing the solution to become turbid. The turbidity of the solution is directly proportional to the content of sulfates in the sample. By measuring the absorbance of the barium sulfate suspension, the content of sulfates can be calculated using the calibration curve.

This monitor adopts the silver chloride spectrophotometric method. Under the presence of surfactant sodium dodecyl sulfate and dispersant polyvinyl alcohol, silver ions react with p-dimethylaminobenzaldehyde rodanine to form a ternary complex. This complex has the maximum absorption at a specific wavelength, and its absorbance is proportional to the concentration, which conforms to the Lambert-Beer law.

A color standard solution was prepared using potassium chloroplatinate and chloroauric acid. Under a specific wavelength, the absorbance of the water color conforms to Beer's law, and the chromaticity value of the sample can be obtained through calculation.

Under the condition of pH value ranging from 6.2 to 6.5, free chlorine directly reacts with (DPD) to form a red compound, and its absorbance is measured at a specific wavelength.

This monitor operates under an alkaline medium at 125°C, using potassium persulfate as the oxidant. It can convert the nitrogen elements in the nitrogen-containing compounds in the sample into nitrate. During this process, the organic matter is simultaneously oxidized and decomposed. Measurements are conducted at wavelengths of 220nm and 275nm, and the total nitrogen value of the sample is obtained through calculation.

This monitor uses potassium persulfate under neutral conditions to digest the sample, oxidizing all the phosphorus in it into orthophosphate. In an acidic medium, the orthophosphate reacts with ammonium molybdate. In the presence of antimony salts, a phosphomolybdenum heteropoly acid is formed, which is immediately reduced by ascorbic acid to produce a blue complex. This complex has the maximum absorbance at a specific wavelength, thereby enabling the determination of the phosphorus content in water.

Supports all the digital online water quality analyzers of our company, and has a complete external interface, which enables convenient functions such as networked control of the analyzers, remote control, and fault diagnosis.

Based on the principle of ion-selective electrode measurement, this analyzer has the features of rapid response, low maintenance cost, and real-time online measurement. It adopts a digital and intelligent design concept, directly outputting standardized digital signals, and can be conveniently connected to the sensor network.

Based on the Lambert Beer absorption law, high-brightness UV LEDs of specific wavelengths are used to irradiate the organic substances in the water sample. The intensity signal after absorption is related to the content of organic substances. The sensor adopts a digital and intelligent sensor design concept, which can automatically compensate for the influence of light source fluctuations and device aging on the measurement values. It directly outputs standardized digital signals, and can achieve networking and system integration without a controller.

Using industrial online glass electrodes, based on the integrated sensor design concept of digitalization and intelligence. The sensor has realized functions such as electrode signal detection, temperature detection and automatic compensation, as well as digital signal conversion. It is widely applied in surface water, pollution sources and other industries.

Based on the design concept of digital and intelligent analyzers, it can automatically compensate for the influence of light source intensity fluctuations and temperature changes on the measurement values. It directly outputs standardized digital signals, enabling networking and system integration even without a controller. It is widely used in industries such as surface water and pollution sources.

Based on the design concept of digital and intelligent analyzers, it can automatically compensate for the influence of light source intensity fluctuations and temperature changes on the measurement values. It directly outputs standardized digital signals, enabling networking and system integration even without a controller. It is widely used in industries such as surface water and pollution sources.

Using high-brightness UV LEDs of specific wavelengths to excite the polycyclic aromatic hydrocarbon oil substances in the water sample, the polycyclic aromatic hydrocarbons are excited to emit fluorescence. The intensity of this fluorescence signal is related to its content value. The analyzer adopts a digital and intelligent analysis instrument design concept, which can automatically compensate for the influence of light source intensity fluctuations, device aging, and temperature changes on the measurement values, and directly outputs standardized digital signals. Without a controller, it can achieve networking and system integration.

Based on the most advanced fluorescence quenching technology principle, this instrument has achieved the detection of dissolved oxygen content in water. The analyzer integrates functions such as automatic temperature compensation and digital signal conversion. It directly outputs standardized digital signals, enabling networking and system integration even without a controller.

Using industrial online quadrupole graphite ring electrodes, based on digitalization, intelligence and integrated analyzer design, the analyzer has realized functions such as electrode signal detection, temperature detection and automatic compensation, as well as digital signal conversion. It is widely applied in surface water, pollution sources and other industries.

Supports all the digital online water quality analyzers of our company, and has a complete external interface, which enables convenient functions such as networked control of the analyzers, remote control, and fault diagnosis.