Workflow of Total Organic Carbon Online Analyzer

After the user purchases the water quality online monitor, its workflow is also one of the tasks that need to be understood. The following is the working process of the (TOC) online total organic carbon analyzer shared by the staff: 1. After the carrier gas Ⅰ passes through the pressure regulator, it is mixed with the reagent from the syringe pump, the water sample from the syringe pump and the distribution valve, and enters together. Agitate the loop and allow for a full acidification reaction. The inorganic carbon in the water sample is converted into carbon dioxide gas under the action of phosphoric acid and then escapes from the gas/liquid separator port. The organic carbon in the water sample and the sodium persulfate in the reagent enter the reactor. Under the oxidation of ultraviolet light and sodium persulfate, the organic carbon is converted into carbon dioxide gas. 2. The carrier gas II enters the reactor through the flowmeter, and drives the carbon dioxide gas into the condenser. The condensed carbon dioxide gas enters the electronic refrigerator to further cool down to 6°C, so as to achieve the purpose of gas/water separation, and the influence of moisture on the measured value. 3. After filtering out solid particles and interfering ions that may exist in the carbon dioxide gas, it enters the NDIR for concentration measurement. 4. NDIR outputs an analog signal corresponding to the concentration of carbon dioxide gas; after AD conversion, this signal is collected and processed by the CPU to display the total TOC value of the water sample. 5. Removal of inorganic carbon: Carbon dioxide, bicarbonate and dissolved carbon dioxide in the sample must be removed before the organic carbon test process, the purpose is to only consider organic carbon. After the sample is mixed with the reagent, the inorganic carbon and phosphoric acid react with the carrier gas, and the carbon dioxide escapes from the gas-liquid separator. 6. Oxidation of organic substances: After mixing the sample and the reagent, it flows into the reactor, and through the irradiation of ultraviolet light and the action of the oxidant sodium persulfate (ammonium), the organic carbon in the sample reacts quickly to form carbon dioxide. 7. Data processing: The instrument adopts a combination of continuous and intermittent sampling, and the TOC oxidation is sufficient, which increases the measurement range, improves the accuracy and stability of the instrument. The data processor collects the CO2 gas concentration for a certain period of time, performs integral processing and linear fitting. 0-5000mg/L large range instrument.