COD digestion instrument instructions

The COD digestion instrument uses digital settings, displays the heating temperature, automatically controls the heating temperature, and sets the heating time. Fast heating rate, constant temperature uniformity, low power consumption, simple operation, stable and reliable performance, widely used in environmental protection, medical, health, food, tap water, paper, sewage treatment, printing and dyeing, petrochemical, metallurgy, colleges and other industries .

Chemical oxygen demand (CODcr) is an important indicator reflecting organic pollution of water bodies and controlling wastewater discharge. It is also one of the mandatory items for water quality testing departments at all levels. Our company widely listened to the opinions of users, and introduced this instrument with reference to GB11914-89 method. The temperature-controlled electric heater replaces the heating of the electric heating furnace, and the air cooling is used instead of the water condensation. The operation method echoes with the national standard method, one-button operation, automatic digestion, energy saving and consumption reduction, easy to use and easy to operate, and also avoids the non-national standard measurement COD. The technical dispute caused.

First, COD digestion features:

1. The digestion hole adopts graphite digestion hole which is resistant to high temperature and strong acid and alkali corrosion, and the heating is more balanced and safer to use;

2, using a one-around heating method, so that the digestion sample is more evenly heated, and the digestion is more thorough;

3. The 12-position digestion holes are separately provided with heating devices to make the holes more uniform in heating, and the digestion temperature can be monotonously controlled;

4, large-screen LCD Chinese display, user-friendly menu design, the operator can quickly grasp the instrument operation method;

5. Digestion uniformity: The heat conduction material is good, the temperature difference between the digestion holes is small, the heating temperature is uniform, and multiple samples are simultaneously digested to ensure the homogeneity of digestion;

6, the digestion hole with a number, easy for the user to distinguish between multiple water samples;

7. Use air cooling instead of traditional tap water cooling method to save energy and protect the environment;

8. The digestion program uses the PID temperature control program to set the temperature deviation from the actual digestion temperature ≤ 2 °C.

Second, COD digestion instrument instructions:

1. Turn on the power switch on the side panel of the instrument. At this time, the instrument displays “000”, “111”, “222”... “999”. Finally, the maximum setting value of the digestion time is displayed for 2 hours and 30 minutes. The fan is turned on at the same time and the fan indicator is on.

2. Change the digestion time setting value, press the “Set” button, and decrease the digestion time to make the set value finally 2 hours. It is also possible to arbitrarily set the digestion time value as needed;

3. Reflow digestion: Press the “Start” button, the instrument will start heating and recirculating digestion, the “Start” indicator will be on, and the heating indicator will be on. After the digestion is completed, the instrument displays “000” and the instrument stops heating;

4, sample processing and analysis methods refer to the national standard analysis method GB11914-89.

Third, COD digestion instrument operation notes:

1. Before using the COD digestion device, add as much distilled water as possible from the water injection port of the return pipe to ensure the cooling effect.

2. The oxidative reflux of the water sample should be carried out in a fume hood to prevent harmful gases such as chlorine from hampering the health of the operator.

3. The waste liquid produced in the COD measurement process contains concentrated sulfuric acid, potassium dichromate and mercury sulfate, which are hazardous wastes and should be treated as hazardous wastes and should not be discharged directly into the sewer.

4. For each experiment, the standard titration solution of ammonium ferrous sulfate should be calibrated. When the room temperature is high, pay special attention to the change of its concentration.

5. After the water sample is refluxed, the distilled water or deionized water should be added slowly from above the condenser to flush the volatile organic substances adhering to the inner wall of the tube to the test solution.

6. When determining the water sample with low concentration of COD, consider some possible influencing factors, such as distilled water or deionized water in polyethylene drum. As the time of storage increases, the COD value will gradually increase, sometimes even It reaches 10mg/L or more.

7. Do not shake the conical flask vigorously during the titration. The test solution in the bottle should not splash, otherwise the measurement result will be affected.

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