Recommendations are made based on a comprehensive assessment of the client’s specific needs, including usage scenarios, target parameters, pollutant concentrations, testing frequency, and budget. A prime example is the application of the Lianhua Technology 5B-6C (V10) water quality analyzer for testing printing and dyeing wastewater.
Printing and dyeing wastewater is a type of high-concentration industrial effluent containing significant amounts of organic and inorganic pollutants; its discharge poses serious risks to the environment and human health. COD (Chemical Oxygen Demand) and BOD5 (Biochemical Oxygen Demand) are critical indicators of organic pollutant concentration and serve as key benchmarks for discharge compliance. my country’s “Pollution Control Standard for the Dyeing and Printing Industry” sets discharge limits of 600 mg/L for COD and 150 mg/L for BOD5. Consequently, wastewater discharge must not exceed these limits. Precise water quality control is particularly essential for printing and dyeing enterprises located near residential areas to safeguard the health of local residents.
Therefore, when selecting a model for a client, we take into account factors such as wastewater concentration and the potential for chloride ion interference to ensure the most suitable instrument is chosen.
The model I recommend to clients is the 5B-6C (V10).
This instrument was designed and manufactured by our company based on the national standard “Rapid Digestion Spectrophotometry (HJ/399-2007)” and complies with the verification regulations for COD analyzers (JJG975-2002). It is suitable for testing a wide range of domestic sewage and industrial wastewater. As an upgraded model, it is designed to meet the diverse needs of various users. Key Features:
1. Features an intuitive menu navigation system and a 5.6-inch color touchscreen, designed for ease of use and quick mastery of operations;
2. Designed and manufactured in strict accordance with the national standard “Rapid Digestion Spectrophotometry (HJ/T399-2007)” and compliant with the JJG975-2002 verification regulations for Chemical Oxygen Demand (COD) analyzers; suitable for testing various types of domestic water and industrial wastewater;
3. A professional-grade water quality analyzer that provides direct concentration readings, ensuring accurate and stable measurement results;
4. Utilizes an interference-free multi-optical path system capable of measuring COD, ammonia nitrogen, total phosphorus, and turbidity; supports both cuvette and test tube colorimetric methods;
5. Includes a data storage function capable of saving 16,000 data sets, which can be easily reviewed;
6. Equipped with an integrated digestion unit featuring intelligent heating, smart timing, and delay protection functions for processing water samples;
7. Supplied with a comprehensive set of professional consumables and reagents, significantly simplifying workflows and enhancing measurement accuracy;
8. Features a built-in calibration function that calculates and stores curves based on standard samples, eliminating the need for manual curve generation;
9. Includes a built-in printer for printing current measurements and stored historical data;
10. Equipped with a USB interface and infrared transmission capabilities for transferring stored historical data to a computer;
11. Features a stylish, aesthetically pleasing housing designed using patented molding technology. Detection Parameters
1. COD
1.1 Measurement range: (2–10,000) mg/L (segmented ranges)
1.2 Indication error: COD ≤ 50 mg/L, error ≤ ±8%; COD > 50 mg/L, error ≤ ±5%
1.3 Chloride interference resistance: No effect at [Cl⁻] < 1,000 mg/L; [Cl⁻] < 4,000 mg/L (optional)
1.4 Stability: < 0.005 A/20 min
1.5 Repeatability: ≤ ±2%
1.6 Measurement time: 20 minutes
2. Ammonia Nitrogen
2.1 Measurement range: (0.02–100) mg/L (segmented ranges)
2.2 Indication error: Error ≤ ±5%
2.3 Stability: < 0.005 A/20 min
2.4 Repeatability: ≤ ±2%
2.5 Measurement time: 20 minutes
3. Total Phosphorus
3.1 Measurement range: (0.01–12) mg/L (segmented ranges)
3.2 Indication error: Error ≤ ±5%
3.3 Stability: < 0.005 A/20 min
3.4 Repeatability: ≤ ±2%
3.5 Measurement time: 45 minutes
4. Turbidity
4.1 Measurement range: (1–300) NTU
4.2 Indication error: Error ≤ ±10%
4.3 Stability: < 0.005 A/20 min
4.4 Repeatability: ≤ ±2%
4.5 Measurement time: 45 minutes
Usage:
This instrument measures four parameters: COD, ammonia nitrogen, total phosphorus, and turbidity. It offers excellent cost-performance, fitting within customer budgets while meeting testing requirements. Compared to the traditional National Standard reflux method, it is simple and easy to use; it requires no extensive technical expertise from operators and allows for immediate testing upon startup—making it an ideal solution for laboratory personnel.
Post time: Jul-03-2026
