Usage Instructions：
Chemical Oxygen Demand (COD) is a mandatory test item in surface water, industrial wastewater, and domestic sewage. It is a critical indicator reflecting the pollution status of oxygen-consuming substances in water quality and is one of the key indicators for implementing total discharge control. The "Determination of Chemical Oxygen Demand in Water Quality—Cr(VI) Method" (HJ828-2017) is currently recognized as a relatively accurate and reliable testing method. However, the reflux digestion process of water samples is a stringent process that requires precise control of temperature and time; failure to do so can lead to deviations in the analysis results.
Our company has extensively gathered feedback from users and developed this instrument in accordance with the HJ828-2017 method. It replaces high-power electric heaters with temperature-controlled electric heaters and uses automatic circulating water cooling instead of tap water cooling. Features such as automatic temperature control, a 120-minute countdown in micro-boiling state, and automatic shutdown upon digestion completion have been implemented, aligning the operational method with national standards. One-touch operation, automatic digestion, energy-saving, and low consumption, simple operation, and convenience are provided, while also avoiding technical disputes that may arise from measuring COD using non-standard methods.
Technical Advantages:
● Compliant with standards
Instrument design is fully compliant with HJ828-2017 "Determination of Chemical Oxygen Demand in Water Quality" Standard for Chromium(VI) Compounds, in compliance with GB11914-89CODThe Dichromate Titration Method, with precise temperature control, complete digestion, and good parallelism.
● One-touch start, full automatic dissolution, unattended operation possible
With just one click, the individual dissolution units automatically heat up to the set temperature according to the programmed sequence, initiate an automatic countdown for回流, and then automatically stop heating.
● Even heating, complete dissolution, all operating parameters visible throughout
Unique PID temperature control program ensures even heating and thorough dissolution. The real-time heating temperature of each dissolution unit and remaining working time can be monitored on a LCD display throughout the process, with real-time changes.
● User-friendly design, easy to operate
LCD touch screen, all individual operating parameters can be monitored in real-time throughout.
Comparative Analysis:
Name | Intelligent Water-Cooled Recirculating Dissolution Apparatus | Standard COD回流消解 Apparatus |
Compliance Standards | HJ828-2017 | HJ828-2017 |
Display Method | Colorful LCD display, separately showing individual unit temperature and time | LCD Display |
Heating Method | An independently heated far-infrared ceramic heating furnace with stable performance and even heating. | Uniform heating tube, uneven heating |
Cooling Method | Automatic internal recirculating water cooling method | Air Natural Cooling |
Add-acid operation | The return pipe is of appropriate length, and it's simple and convenient to add acid. | The return pipe is longer, making the acid addition operation slightly inconvenient. |
Return Tube Design | Spherical Reflux Condenser Tube | Umbrella-type straight tube return pipe |
Return Tube Flush | Disinfection complete; directly flush with pure water above the return pipe, simple and easy to operate. | Remove the decommissioning unit from the main unit and flush with pure water. |
Temperature Control Accuracy | ±1℃ | ±3℃ |
Dissolution Unit | 12 individually controllable | 12 pieces |
Heating Power | 2500W Single Hole Power: ≤400W | 1500W |
