Usage

Chemical oxygen demand ( COD) is a must-measure item in surface water, industrial wastewater, domestic sewage and other water bodies. It is an important indicator reflecting the pollution status of water quality by oxygen-consuming substances, and is also one of the key indicators for the country to implement total emission control. The "Determination of Chemical Oxygen Demand of Water Quality by 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 process with strict temperature and time control. If it is not mastered well, it will cause deviations in the analysis results.

Our company has listened to the opinions of users extensively and launched this instrument in accordance with the HJ828-2017 method. The instrument uses a temperature-controlled electric heater instead of a high-power electric furnace for heating, and automatic circulating water cooling instead of tap water for cooling. It also uses automatic temperature control, automatic countdown for 120 minutes in the micro-boiling state, and automatic shutdown at the end of digestion. The operating method is consistent with the national standard method, with one-button operation, automatic digestion, energy saving and consumption reduction, and is simple and easy to use. It also avoids technical disputes caused by non-national standard methods for measuring COD.

Main technical advantages:

● Fully in line with national standards

The instrument design is completely based on the national standard HJ828-2017 "Determination of Chemical Oxygen Demand in Water - Dichromate Method", with precise temperature control, thorough digestion and good parallelism;

● One-button start, full automatic digestion, no need for unattended operation

Just one-button start, each digestion unit will automatically heat up to the set temperature according to the set program, automatically count down to reflux, and automatically stop heating;

● Even heating, thorough digestion, and visible operating parameters throughout the process

The original PID temperature control program ensures uniform heating and thorough digestion. The instant heating temperature and remaining working time of each digestion unit can be monitored on the LCD screen and change in real time.

● Humanized design, easy to operate

The reflux condenser can be automatically raised and lowered with one button. The push-pull design of the digestion area compartment makes it easy to take and place the digestion bottle. There is a 7-inch LCD touch screen on the right side, and all partition operating parameters can be monitored in real time throughout the process.

Model comparison analysis: