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CODCR online analyzer
Wuxi Dianchuang Technology provides you with prices, models, and user manuals for CODCR online analyzers. Using the principle of potassium dichromate
Product details
The so-called chemical oxygen demand (COD) refers to the amount of oxidant consumed when treating water samples with a certain strong oxidant under certain conditions. It is an indicator of the amount of reducing substances in water.
The reducing substances in water include various organic compounds, nitrites, sulfides, ferrous salts, etc. But the main thing is organic matter. Therefore, chemical oxygen demand (COD) is often used as an indicator to measure the content of organic matter in water.
The reducing substances in water include various organic compounds, nitrites, sulfides, ferrous salts, etc. But the main thing is organic matter. Therefore, chemical oxygen demand (COD) is often used as an indicator to measure the content of organic matter in water.
The determination of chemical oxygen demand (COD) varies depending on the reducing substances in the water sample and the measurement method used. Currently, the commonly used method is the acid potassium permanganate oxidation methodpotassium dichromateOxidation method.
The determination of COD using potassium permanganate as an oxidant is called the potassium permanganate index, also known as CODMN; The determination of COD using potassium dichromate as an oxidant is called the potassium dichromate index, also known as CODCR.
The determination of COD using potassium permanganate as an oxidant is called the potassium permanganate index, also known as CODMN; The determination of COD using potassium dichromate as an oxidant is called the potassium dichromate index, also known as CODCR.
1、 Overview of CODCR Online Analyzer
Codcr uses potassium dichromate（K2Cr2O7）Measured as an oxidantchemical oxygen consumption, namely dichromate saltindexThe chemical oxygen demand measured using potassium dichromate as an oxidant in a strongly acidic solution.
The Point Creation CODCR analyzer adopts a humanized design, which makes this product have lower failure rate, lower maintenance, longer service life, and higher cost-effectiveness and accuracy compared to similar products. This instrument is suitable for online automatic continuous monitoring of wastewater with chemical oxygen consumption in the range of 10-1000mg/L and chloride concentration below 1000mg/L.
two、 Codcr measurement principle
The sample, potassium dichromate digestion solution, silver sulfate solution (silver sulfate as a catalyst can more effectively oxidize linear fatty compounds), and concentrated sulfuric acid mixture are heated to 165 ℃. Potassium dichromate is reduced to trivalent chromium by organic matter in water. The trivalent chromium content is measured at a specific wavelength, and the mass concentration of oxygen consumed is calculated based on the amount of trivalent chromium ions consumed (the amount of dichromate ions consumed corresponds to the amount of oxidizable organic matter) to calculate the COD value. Reducing inorganic substances such as nitrite, sulfide, and ferrous ions can improve measurement results, and their oxygen consumption will be added to the COD value. The interference of chloride ions can be eliminated by adding mercuric sulfate, as chloride ions can form very stable mercuric chloride with mercury ions.
The sample, potassium dichromate digestion solution, silver sulfate solution (silver sulfate as a catalyst can more effectively oxidize linear fatty compounds), and concentrated sulfuric acid mixture are heated to 165 ℃. Potassium dichromate is reduced to trivalent chromium by organic matter in water. The trivalent chromium content is measured at a specific wavelength, and the mass concentration of oxygen consumed is calculated based on the amount of trivalent chromium ions consumed (the amount of dichromate ions consumed corresponds to the amount of oxidizable organic matter) to calculate the COD value. Reducing inorganic substances such as nitrite, sulfide, and ferrous ions can improve measurement results, and their oxygen consumption will be added to the COD value. The interference of chloride ions can be eliminated by adding mercuric sulfate, as chloride ions can form very stable mercuric chloride with mercury ions.
3、 Codcr Automatic Tester Product Qualification Certificate
Wuxi Dianchuang Technology Co., LtdIn October 2015, the Wuxi Quality and Technical Supervision Bureau recognized the production conditions, product quality, and measurement management of the factory as qualified and issued the "License for Manufacturing Measuring Instruments of the People's Republic of China".On February 20, 2017, it obtained the "China Environmental Protection Product Certification Certificate" issued by the China Environmental Protection Industry Association, mainly for the technical quality certification, market access, and licensing of the CODCR water quality automatic online analyzer series products.
4、 Codcr monitoring instrument parameters
| instrument parameters | Parameter Description | measuring method | notes | |
| measureQuantity range | 10-1000.0 mg/L | National standard GB11914-89 "Water quality - Determination of chemical oxygen demand - Potassium dichromate" | Automatic alarm for instrument abnormalities; Automatic saving of power-off data; 7-inch 60000 color TFT touch screen display and command input; After abnormal reset and power failure, the instrument will automatically discharge residual reactants and restore working status. | |
| Detection limit | 0.001mg/L | |||
| refinedAccuracy | When ≥ 100mg/L, not exceeding ± 15%; When<100mg/L, not exceeding ± 5mg/L | |||
| reproducibility | ±5% | |||
| measureQuantity cycle | The measurement cycle is 35 minutes | |||
| pickSample cycle | Time interval (1-65530 minutes can be set arbitrarily) and 24-hour hourly measurement mode | |||
| schoolQuasi cycle | Time interval (1-65530 minutes can be set arbitrarily) and 24-hour hourly measurement mode | |||
| Maintenance Cycle | monthly | |||
| letterNumber output | Standard RS-232 (RS485 optional) and 4-20mA (0-5V output optional) | |||
| ringEnvironmental requirements | For indoor environments with adjustable temperature, it is recommended to have a temperature range of+5-35 ℃; Humidity ≤ 90% (non condensing) | |||
| electricitysource | AC220×（1±0.1）V，50×（1±0.05）Hz，10A | |||
| chicun | 600mm in length, 500 in width, and 1500 in height |
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5、 Application Fields of Codcr Analyzer
This instrument is widely used in industrial wastewater, rivers, lakes, surface water, municipal pipelines, sewage treatment plants and other water bodiesContinuous analysis and monitoring of chemical oxygen demand (COD).
6、 Customer Case
Customers such as Nanda Optoelectronics and Shide County Sewage Treatment Plant have installed a complete set of water quality analysis instruments from Dianchuang, including CODCR online analyzer, total phosphorus and total nitrogen analyzer, ammonia nitrogen analyzer, and some heavy metal analyzers.
Codcr online analyzer: http://www.wxdct.cn/c_html_products/codcrzaixianfenxiyi-302.html
Related information:User Manual for Codcr Online Analyzer 《Installation plan for online water quality monitoring instrument》
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