Shanghai Jingqi Glass-Ceramic Standard COD Digester HCA-120, Shanghai Jingqi Instrument Co., Ltd. (CAT#: STEM-GLE-2108-YJL)

Shanghai Jingqi Glass-Ceramic Standard COD Digester HCA-120, model HCA-120 is manufactured by Shanghai Jingqi Instrument Co., Ltd.
HCA-120 glass-ceramic standard COD digester (temperature-controlled type) follows the standard (ISO) and the national HJ828-2017 standard analysis method, and stipulates the determination steps of COD of water quality chemical oxygen demand. The heating and digestion time of the method, the acidity of the solution, the amount of oxidants and catalysts and other condition indicators of the method are strictly stipulated to ensure reliable and accurate analysis results.
The digestion device uses microcomputer technology to set the digestion timing, digestion temperature and heating power control, and can simultaneously heat eight 250ml Erlenmeyer flask digestion reflux devices. It can achieve the purpose of saving energy, reducing power load and improving efficiency. The digester uses a glass burr return pipe instead of a spherical return pipe, and uses air-cooling technology to replace tap water cooling, and uses still water to assist cooling at the end of the condensation pipe, which can save water and standardize the instrument, and at the same time improve the safety of the instrument.
The chemical solution preparation, operation and COD calculation of the digester fully comply with the HJ828-2017 national standard. For COD water samples lower than 50mg/L, the accuracy can be improved by diluting the titrant and oxidant, and for COD water samples higher than 700mg/L, the measurement can be completed by proportional dilution of the water samples.

Measuring range: 10 ~ 700mg/L (measured after dilution of water samples greater than 700m0g/L)
Digestion time: 10 minutes to 2 hours and 30 minutes (users can choose the heating time independently)
Measurement error: the relative standard deviation of potassium hydrogen phthalate standard solution (500mg/L) is not more than 5.0%; the relative standard deviation of industrial organic wastewater (500mg/L) is not more than 8.0%
Ambient temperature: 5∽35℃
Number of digestion samples: 12 (250ml Erlenmeyer flask with No. 24 ground mouth)
Heating power: ≤1500W (AC 220V, 50HZ, the user can choose the heating power independently, adjustable in 7 levels)
Temperature control range: 5℃～600℃
Instrument size: 590mm(L) * 300mm(W) * 590mm(H)

The wavy ribbon-shaped electric heating wire of the flat-panel electric hob is a new type of rare earth alloy material, which has high heating efficiency, no open flame in the furnace wire, and extremely long service life. The surface of the electric hob is covered with a glass-ceramic panel that can withstand a high temperature of 800 degrees. The application of glass-ceramic has a single vertical heat transfer characteristic, which reduces thermal diffusion. There are 8 small electric furnaces with equal power and diameter equal to the diameter of the flask in the heating electric furnace tray, which reduces the heat energy loss that does not require heating space, so that the surface of the glass-ceramic heats evenly, the heating and cooling speed is fast, and the thermal efficiency is high.
The heating and temperature control adopts microcomputer technology, and the heating and temperature control adopts solid-state relay non-contact switch control, which does not generate any interference source of arc to affect the work of other precision instruments in the laboratory.
Microcomputer technology is used to set the digestion time, heating power and temperature of the heating plate. After the digestion is completed, the instrument automatically stops heating, and the instrument fan continues to work for one hour to assist the cooling of the sample, without personnel supervision.
High-temperature-resistant glass-ceramic is used as the heat-conducting medium of the electric hob of the digester, which has the advantages of uniform heating, rapid heating and cooling, flat, smooth surface and easy cleaning. Just wipe it dry with a cloth after contamination to reduce damage to the instrument due to improper operation.
The mechanical structure design of the digester is reasonable, the shell design is fashionable and novel, the operation is simple, easy to clean, and the service life is increased at the same time.
Improved glass burr condenser tube and heat dissipation system, its good reflux effect ensures the parallelism and accuracy of the sample digestion effect.
The solution in the digestion bottle has boiled due to the temperature difference in the use environment and seasons, but the temperature in the heating plate is still accumulating and rising. Cause the solution in the digestion flask to overboil (not simmer). The instrument can reasonably set the heating temperature of the heating plate by the user according to the working environment temperature, and keep it constant at the set temperature, while displaying the current temperature in the heating plate. Effectively avoid cascade boiling and overboiling caused by excessively high temperature accumulation on the heating plate, and ensure the accuracy of the measurement results.

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