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Beijing Jingxiang Environmental Technology Co., Ltd
Sharing the technical characteristics of the five core components of the phosphate online analyzer
Date: 2025-12-15Read: 0
In thermal power generation, chemical industry, sewage treatment, and circulating cooling water systems, the concentration of phosphate ions is a key indicator for controlling boiler scaling, corrosion, and eutrophication of water bodies. The online phosphate analyzer achieves continuous and accurate monitoring of trace phosphates in water through automated chemical colorimetry. Its stable and reliable performance is derived from the collaborative operation of multiple precision functional modules. The following analyzes the technical characteristics of the five core components of the phosphate online analyzer.
1、 Sampling and preprocessing unit
This module includes an automatic sampling pump, filter, and stabilizing device, responsible for extracting representative water samples from the process pipeline and filtering out suspended particles (usually using 5-10 μ m filter cartridges) to prevent blockage of subsequent flow paths. Some models are equipped with automatic backwashing or self-cleaning filters to adapt to high turbidity water quality and ensure injection stability.
2、 Reagent storage and dispensing system
The instrument is equipped with multiple corrosion-resistant reagent bottles (such as molybdate, ascorbic acid, acidification solution, etc.), which are quantitatively injected into the reaction tank through high-precision peristaltic pumps or injection pumps according to the program. The pump tube is made of fluororubber or PTFE material, which is resistant to strong acids and alkalis; The filling volume error is usually controlled within ± 1% to ensure the repeatability and linearity of the color reaction.
3、 Reaction and color development unit
The water sample and reagent are mixed in a constant temperature reaction tank (usually 30-40 ℃), and after acidification and oxidation, a phosphomolybdic blue complex is formed. Constant temperature design accelerates reaction and reduces the impact of environmental temperature fluctuations. The material of the reaction tank is optical grade quartz or special glass, with good transparency and corrosion resistance. Some models adopt a flow-through design to achieve continuous measurement.
4、 Optical detection system
Composed of LED light source (wavelength approximately 880nm), optical filter, photodiode or CCD sensor. Phosphorus molybdenum blue has characteristic absorption in the near-infrared region. The instrument measures the absorbance by colorimetric method and converts the phosphate concentration according to Lambert Beer's law. The high stability light source and temperature compensation algorithm effectively suppress drift, with a detection limit of up to 0.01mg/L (calculated as P).
5、 Control and Communication Module
Embedded microprocessor controls the entire process timing, supports multi-point calibration, automatic cleaning, and fault self diagnosis. Equipped with a 7-inch touch screen, it displays concentration curves, alarm status, and maintenance prompts in real-time. Rich communication interfaces, including 4-20mA analog output RS485（Modbus）、 Ethernet or 4G can seamlessly connect to DCS, SCADA, or smart water platforms.