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、 Product Introduction:
This product is mainly used to detect COD indicators in water. On the premise of complying with national standards, it combines classic colorimetric methods with advanced computer technology, and applies microcomputer optoelectronic colorimetric detection principles to replace traditional visual colorimetric methods, eliminating human errors and greatly improving measurement resolution. This product has the characteristics of automatic PID temperature control, dual LCD display, automatic zero adjustment, concentration direct reading, curve storage, automatic printing, etc. The instrument is easy to operate, and users do not need complex professional knowledge to apply this product.
3、 Application scope:
Suitable for 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 mills, paper mills, printing and dyeing factories, etc.); Suitable for testing the water quality of surface water, groundwater, industrial wastewater, domestic sewage, tap water, etc.
4、 Technical parameters:
1. Simultaneous digestion of sample quantity: ≤ 12;
2. Dissolving temperature control range: ≤ 200 ℃, time control range ≤ 999 minutes, automatic timing;
3. Standard curve: 100 measurement curve parameters can be set for each indicator;
4. Data storage: 30000 measurement data;
5. Data calibration: automatic correction of curve values;
6. Environmental temperature: (5~40) ℃; Environmental humidity: relative humidity<85% (no condensation);
7. Working power supply: AC 220V ± 10%/50Hz;

Measurement Object	Chemical Oxygen Demand (COD)
measuring range	5-5000mg/L segmented measurement
measurement error	5-150mg/L； Absolute error ≤ 5mg/L 100-5000mg/L； Relative error ≤± 5%
repeatability	≤3%
Dissolving temperature	165℃±1℃
digestion time	15min
Anti chlorine interference	1000mg/L
weight	Dissolving and testing integrated, 6kg

5、 Functional features:
1. Dual LCD display, large LCD backlit display, Chinese operation interface.
2. The instrument can automatically switch the range according to the actual situation of the water sample.
3. The measurement and digestion systems are independently controlled by power sources and are carried out separately without affecting each other;
4. Automatic temperature control, PID regulation technology, constant temperature and high accuracy during the digestion process;
5. The calibration mode from 1 o'clock to 7 o'clock automatically calculates slope, intercept, and correlation coefficient, with high measurement accuracy.
6. Intelligent design for fault self diagnosis makes instrument management and maintenance simple and convenient.
7. Built in real-time clock, each measurement record has a measurement timestamp for easy statistics and queries;
8. The large amount of data storage and power-off protection design ensure that the instrument is not damaged and data records are never lost.
9. The instrument has strong anti-interference ability, high measurement data accuracy, good stability, and the lifespan of the light source can reach tens of thousands of hours.
10. Equipped with a data output interface RS232, it can transmit measurement data to a computer;
11. The instrument comes with a printer that can directly print measurement data and historical data;
12. Low reagent usage and low operating costs.