Purpose Description

Chemical Oxygen Demand (COD) is a mandatory testing item for surface water, industrial wastewater, domestic sewage, and other water bodies. It is an important indicator reflecting the pollution status of oxygen-consuming substances in water quality and one of the key indicators for national total emission control. The "Water Quality - Determination of Chemical Oxygen Demand - Potassium Dichromate Method" (HJ828-2017) is currently recognized as a relatively accurate and reliable detection method. However, the reflux digestion process of water samples is a temperature- and time-sensitive procedure. Poor control may lead to deviations in analysis results.

Our company extensively listens to user feedback and, based on the HJ828-2017 method, has developed this instrument. It replaces high-power electric furnaces with temperature-controlled electric heaters, uses automatic circulating water cooling instead of tap water cooling, and incorporates technologies such as automatic temperature control, micro-boiling state for 120 minutes with auto countdown, and automatic shutdown after digestion. These features ensure the operation method aligns with national standards, enabling one-click operation, automatic digestion, energy savings, and simplified usage while avoiding technical disputes caused by non-standard COD measurements.

Main Technical Advantages:

• Fully Complies with National Standards

The instrument is designed strictly according to the national standard HJ828-2017 "Water Quality - Determination of Chemical Oxygen Demand - Potassium Dichromate Method," ensuring precise temperature control, thorough digestion, and good parallelism.

• One-Click Start, Fully Automatic Digestion, No Need for Manual Monitoring

Just press one button to start. Each digestion unit follows the preset program, automatically heating to the set temperature, auto countdown for reflux, and automatic shutdown upon completion.

• Uniform Heating, Thorough Digestion, Full Process Parameter Visibility

Unique PID temperature control program ensures uniform heating and thorough digestion. Real-time heating temperature and remaining working time for each digestion unit can be monitored via the LCD screen.

• User-Friendly Design, Easy Operation

The reflux condenser can be raised or lowered with one click. The digestion chamber features a push-pull design for easy bottle handling. A 7-inch LCD touchscreen on the right allows real-time monitoring of all operational parameters.

Model Comparison Analysis: