CODcr PCZ COD online monitoring instrument Introduction: This instrument is designed and manufactured in accordance with the national standard GB11914-1989 for water quality chemical oxygen demand determination and the environmental protection industry standard HJ/T377 2007 for chemical oxygen demand (CODcr) water quality online automatic monitoring technology requirements. It adopts new optical measurement, high-temperature and high-pressure digestion, and digestion colorimetric integration technologies, and has the characteristics of accurate measurement, low detection limit, high reliability, and strong adaptability. It is widely used in environmental protection, production monitoring and other fields, and is an ideal instrument for environmental monitoring and control. Detection principle: Using potassium dichromate rapid digestion spectrophotometry to measure the organic content in water samples. Quantitative potassium dichromate and sulfuric acid are added to the water sample, and silver salt is used as a catalyst under strong acid conditions. After high-temperature digestion at 165 degrees Celsius, the oxygen consuming organic matter and reducing substances in the water sample convert chromium (VI) into chromium (III). The reduction of chromium (VI) is measured by photoelectric colorimetry, and the measured value of the sample is compared with the calibration curve of the standard sample to obtain the COD in the sample. Technical Specifications: Measurement method: Potassium dichromate high-temperature digestion, colorimetric determination (national standard GB11914-89) Test range: (0-500) mg/l, (500-2000) mg/l, (2000-5000) mg/l Three range options are available Test range: 0-40000mg/l (after automatic dilution) Anti chloride ion interference: 0-40000mg/l (after automatic dilution) Offline detection: 8 mg/l Resolution:<1mg/l Accuracy: Standard solution<5%; Water sample<10% (when the concentration of the test solution is greater than 100mg/L) Reproducibility:<3% (when the concentration of the test solution is greater than 100mg/L) Dissolving temperature: 165 ℃, adjustable Dissolving time: 15 minutes, adjustable Fault free running time: ≥ 720h/time Range drift: ± 3% F.S Sample interval: continuous, 1 hour, 2 hours... 24 hours, trigger Calibration interval: manually or automatically at selected intervals and times (1-7 days) Cleaning interval: manually or automatically at selected intervals and times (1-7 days) Maintenance interval:>1 month, approximately 1 hour each time Reagent consumption: Approximately 358 samples per set of reagents Human computer interface: 7-inch, 70000 colors, 800 * 480 resolution, TFT true color touch screen Printing method: Mini printer printing function (optional) Storage space: 20000 pieces of data, not lost in case of power failure, automatically overwritten when fully stored (can add 40000 pieces of data) Communication interface: 1 RS232 digital interface or RS485, supporting MODBUS communication protocol or custom protocol 1 analog signal 4-20mA (20mA corresponds to adjustable range) Power supply requirements: AC 220V ± 20%, 50Hz ± 1% Power: 300W Working environment: Temperature range of 5-40 ℃, relative humidity ≤ 85% Dimensions: 770 × 600 × 450 (mm) Weight: 50kg
Introduction: This instrument is designed and manufactured in accordance with the national standard GB11914-1989 for water quality chemical oxygen demand determination and the environmental protection industry standard HJ/T377 2007 for chemical oxygen demand (CODcr) water quality online automatic monitoring technology requirements. It adopts new optical measurement, high-temperature and high-pressure digestion, and digestion colorimetric integration technologies, and has the characteristics of accurate measurement, low detection limit, high reliability, and strong adaptability. It is widely used in environmental protection, production monitoring and other fields, and is an ideal instrument for environmental monitoring and control. Detection principle: Using potassium dichromate rapid digestion spectrophotometry to measure the organic content in water samples. Quantitative potassium dichromate and sulfuric acid are added to the water sample, and silver salt is used as a catalyst under strong acid conditions. After high-temperature digestion at 165 degrees Celsius, the oxygen consuming organic matter and reducing substances in the water sample convert chromium (VI) into chromium (III). The reduction of chromium (VI) is measured by photoelectric colorimetry, and the measured value of the sample is compared with the calibration curve of the standard sample to obtain the COD in the sample.
