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Instrument introduction:
Chemical oxygen demand (COD) is a must-test item in surface water, industrial wastewater, domestic sewage and other waters. It is an important indicator reflecting the pollution of water quality by oxygen-consuming substances, and it is also one of the key indicators for the country to implement total emission control. one. The "Dichromate Method for the Determination of Chemical Oxygen Demand of Water Quality" (HJ828-2017) is currently recognized as the most accurate and reliable detection method for measurement results. However, the reflux digestion process of the water sample is a process with strict temperature and time control, and poor mastery will cause deviations in the analysis results.
Our company introduced this instrument with reference to the HJ828-2017 method. Use PID temperature control electric heater instead of high-power electric furnace heating, use air cooling instead of water condensation, one-button start, automatic temperature control, 120-minute automatic countdown in the micro-boiling state, automatic shutdown after digestion, and other technical means, realizing the operation method and national standard The method echoes the law, one-key operation, automatic digestion, energy saving and consumption reduction, simple to use and convenient to operate, and it also avoids technical disputes caused by non-national standard method for COD measurement.

Main technical specifications:

• Digestion components: the digestion holes are made of graphite material, and the number of digestion holes is 12, which can be single-hole and single-control;

• Heating element: adopts independent integrated winding heating mode design, so that each heating hole is heated evenly and dissipated completely;

• Cooling method: uniquely designed air-cooled reflux condenser, with an umbrella-shaped liquid filling port on the top to facilitate flushing;

• The single-hole heating technology is used to make the sample heated evenly, and the overall heating mode is not allowed;

• Heating control program: using PID temperature control technology, the error between the designed heating temperature and the actual heating temperature does not exceed ±1℃;

• The heating temperature and digestion time countdown can be set in a single hole, and the digestion can be automatically stopped after the digestion;

• During the digestion process, the actual heating temperature and reflux countdown time of each digestion hole can be monitored in real time through the front display;

• Digestion bottle design: The volume of the digestion bottle is about 300ml. After the digestion, it can be titrated directly in the bottle without pipetting;

• It adopts a 7-inch LCD touch screen design, with a splash-proof cover protection design on the top of the touch screen;

• Operation mode: After the parameters are set, it can be started by one button, and the digestion process is automatically completed (each digestion hole automatically reaches the set digestion temperature, automatic reflux countdown, and automatic stop), without manual duty.