The new national standard HJ828-2017 replaces the national GB 11914-89 standard analysis method, and standardizes the determination steps of the water quality chemical oxygen demand COD (Cr), strictly stipulates the method of heating digestion time, solution acidity, oxidant and catalyst dosage And other condition indicators. Obviously, there are strict conditions for the determination of water quality COD (Cr), and operations that violate the conditions will affect the accuracy of the measurement. KHCOD-8K type national standard method COD digestion and reflux device, using microcomputer technology and reasonable design, can heat and reflux digestion of 8 250ML conical bottles at the same time. Fully abide by the new national standard HJ828-2017 national standard method, glass ceramic table top, use high-quality heating wire, reasonable heating power, to ensure a slight boiling for 2 hours. KHCOD-8K type national standard method of COD digestion and reflux device is another innovation. It adopts temperature-controlled heating, which is heated to the set temperature, and will not continue to heat up. First, it saves energy. Second, it has a temperature control protection function. It can set the boiling temperature. The temperature difference with the region, regardless of the difference between the summer and winter room temperature, you can set the boiling temperature arbitrarily, and change the fixed power of the ordinary standard COD digester. The difference between the summer and winter room temperature difference boiling effect is different, the power is too large in the summer, and the power is small in the winter. Case. KHCOD-8K type national standard method COD digestion and reflux device, use special special heating plate for heating, glass-ceramic table, overall structure, reasonable space design, installation and replacement of heating plate is very convenient and simple, heating surface heating even heating, heating and cooling speed fast. The sample solution is dripped accidentally, and it is easy to clean up. The KHCOD-8K type national standard method COD digestion reflux device can set the digestion time and display the countdown of the digestion time. After the digestion is completed, the instrument automatically stops heating, the instrument fan continues to work, and the auxiliary sample is cooled, which can be left unattended. KHCOD-8K type national standard method COD digestion and reflux device uses glass burr reflux tube instead of spherical reflux tube, and replaces circulating water cooling method with air cooling and water cooling technology, the operation is more convenient. The cooling part is mainly completed by the water cooling of the burr condenser tube and the fan air cooling. The upper part of the condenser tube is spherical 3 bubbles, the cooling effect is better, and the catalyst is added here to prevent the instantaneous volatilization of the light components in the sample and can be capped to volatilize. cap. The lower part is a "burr" shape, and three opposing "cold bubbles" protruding from the condenser tube wall on a plane increase the cooling area more than a simple spherical condenser tube, and can block the passage of volatile substances and vapors. , Plus the dual role of the cooling water in the upper part of the spherical return pipe and the fan in the machine. KHCOD-8K type national standard method COD digestion reflux device, the instrument's chemical solution preparation, operation and COD calculation fully comply with HJ828-2017, COD water samples below 50mg/L can be diluted by titrant and oxidant to improve accuracy, high For a 1000 mg/L COD water sample, the measurement can be completed by proportional dilution of the water sample. Conform to national standard: the new standard HJ828-2017 replaces the original GB 11914-89 LCD display: display standby, digestion, temperature control, air cooling, display heating plate temperature, and display digestion time, Measuring range: 5～700mg/L, 700mg/L～10000mg/L water sample after dilution Digestion time: 1 minute to 9 hours and 60 minutes (users can choose the heating time independently, normal 2 hours and 30 minutes) Control temperature: room temperature-400 ℃, automatic heating temperature control. (Generally set between 280-350℃, set according to the first boiling start point) Measurement error: relative standard deviation of potassium hydrogen phthalate standard solution (500mg/L) is not greater than 5.0%; The relative standard deviation of industrial organic wastewater (500mg/L) is not more than 8.0% Ambient temperature: ≤ 40℃ Cooling method: double fan air cooling, plus 3 bubble condenser water cooling Number of digested samples: 8 250ml Erlenmeyer flasks, heated and digested in two rows at the same time Heating table: The glass ceramic heating table, the overall structure of the heating plate, overhead heating, replacement and maintenance are directly removed, which is very convenient. Heating power: ≤2000W (AC 220V, 50HZ) Instrument size: 490*290*605mm (H) Vc Enzyme Combo Repair Shampoo
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