1、 Execution standards:
Compliant with《HJ/T 399-2007The requirements for the determination of chemical oxygen demand in water quality by rapid digestion spectrophotometry.
2、 Technical principle:
The instrument consists of two main parts: a digestion device and a measuring instrument host. It adopts an integrated design, which is convenient to carry and has a beautiful appearance. The main principle is that after adding special oxidants and catalysts to the water sample, it is heated and digested. The Cr6+part in the oxidant is reduced to Cr3+, and the reduced Cr3+content is directly displayed as the actual concentration of COD in the water sample through colorimetric measurement and regression calculation.
3、 Application scope:
This itemCOD analyzerSuitable for on-site water quality testing in fields such as sewage treatment plants, monitoring stations, environmental protection bureaus, third-party testing, petrochemicals, steel mills, power plants, healthcare, universities, and production-oriented enterprises (including food factories, paper mills, printing and dyeing factories, etc.); Suitable for on-site detection of surface water, groundwater, industrial wastewater, domestic sewage, tap water and other water quality, with real-time data output.
4、 Technical parameters:
1. Measurement method: Rapid digestion spectrophotometry;
2. Dual wavelength measurement range: Low wavelength: 5-150mg/l; High wavelength: 150-2500 mg/L (diluted and measured when>1000 mg/L);
3. Measurement error: 5-100 mg/L, absolute error ≤± 5 mg/L; 100 mg/L~2500 mg/L, relative error ≤± 5% (customized for large quantities)
4. Dissolving temperature: 165 ± 1 ℃;
5. Dissolving time: ≤ 15 minutes;
6. Dissolve quantity: Simultaneously dissolve 4 water samples;
7. Anti chlorine interference: [CL-] ＜1000mg/ L； [CL -]<4000mg/L (optional);
8. Temperature indication error: ＜ ± 1℃；
9. Uniformity of temperature field: ≤ 2℃；
10. Dissolving time indication error: ≤ ± 2%；
11. Curve parameters: Built in 50 measurement curves;
12. Record storage: capable of storing 500 measurement results.
13. Environmental temperature: (5~40) ℃;
14. Environmental humidity: relative humidity<85% (no condensation);
15. Working power supply: AC220V ± 10%/50Hz, DC+16V lithium battery, rechargeable.
5、 Functional features:
1. Dual LCD display, pure Chinese operation interface;
2. Unique optical circuit design, strong anti-interference ability, high accuracy, and good stability;
3. Automatic PID temperature control, constant temperature and high accuracy during the digestion process;
4. Automatic zeroing, curve storage, and convenient calibration;
5. Measurement and digestion do not interfere with each other and have independent power control;
6. The instrument is powered by a rechargeable lithium battery and can be used continuously for more than 8 hours;
7. The measurement light source adopts a cold light source, and the lifespan of the light source lamp is up to 100000 hours, with small drift and long lifespan;
8. The instrument has a built-in real-time clock, and each measurement record has a measurement timestamp for easy statistics and queries;
9. Equipped with a data output interface, it can be connected to a computer to transmit measurement data to the computer;
10. The instrument has a built-in printer that can directly print measurement data and historical data;
11. Handheld box design, lightweight, aesthetically pleasing, and easy to carry.