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 the most accurate and reliable detection method. However, the reflux digestion process of water samples is highly temperature- and time-sensitive, and improper handling may lead to analytical deviations.
Our company has developed this instrument based on the HJ828-2017 method. It replaces high-power electric furnaces with PID-controlled electric heaters and uses air cooling instead of water condensation. Features include one-click startup, automatic temperature control, micro-boiling state for 120 minutes with automatic countdown, and automatic shutdown after digestion. These technical innovations ensure compliance with national standards, simplified operation, energy efficiency, and avoidance of technical disputes arising from non-standard COD measurements.

Main Technical Specifications:

• Digestion Component: Digestion holes are made of graphite material, with 15 holes, each independently controllable;

• Heating Component: Independent integrated coiled heating design ensures uniform heating for thorough digestion;

• Cooling Method: Unique air-cooled reflux condenser design with a funnel-shaped liquid addition port for easy rinsing;

• Single-hole heating technology ensures uniform sample heating, avoiding bulk heating modes;

• Heating Control Program: PID temperature control technology limits heating temperature deviation to ±1°C;

• Individual hole settings for heating temperature and digestion countdown, automatic shutdown upon completion;

• Real-time monitoring of each hole's heating temperature and reflux countdown via front display;

• Digestion Bottle Design: 300ml capacity, allows direct titration without liquid transfer;

• 7-inch LCD touchscreen with splash-proof cover;

• Operation Mode: One-click startup after parameter setup, fully automated digestion (auto-reach set temperature, countdown, and shutdown), no manual supervision required.