COD determination principle (Chromium method)：In a strongly acidic solution and in the presence of excess potassium dichromate, using silver sulfate as catalyst, the reductive substances in water are oxidized by heat. By establishing the relation between the absorbance value of hexavalent chromium or trivalent chromium and the COD value of water sample, the COD value of water sample is determined.
CONTACT WECHAT:18156665555COD determination principle (Chromium method)：In a strongly acidic solution and in the presence of excess potassium dichromate, using silver sulfate as catalyst, the reductive substances in water are oxidized by heat. By establishing the relation between the absorbance value of hexavalent chromium or trivalent chromium and the COD value of water sample, the COD value of water sample is determined.
Feature:
Colorimetric system
Luxury multi-parameter measuring instrument, which can determine the high and low range COD, ammonia nitrogen, total phosphorus, total nitrogen, etc
It has the function of artificial intelligence voice broadcast prompts and can adjust the volume at will,which is easy to use
Equipped with 112 kinds of pre-programmed curves 990 curves
Concentration direct reading, precision measurement results
With data storage function, can store 900,000 groups of data, and can be freely viewed
7 inch HD color LCD touch screen display, full Chinese display,which is in line with daily operation habits, easier to master the operation
The instrument has its own calibration function, can calculate according to the standard sample, and store the curve, which is no need to manually make the curve.
It has printer function and can print current data and stored historical data
Equipped with USB interface transmission function, able to transfer stored historical data to the computer
Adopt tube colorimetric, dish colorimetric, double colorimetric system
Digestion apparatus
It has a fully transparent integrated heat-resistant protective cover, which is intuitive and safe. The upper end of the digestion module is attached with an aviation heat insulation layer to effectively prevent scald
5 inch color LCD touch screen
It has the function of artificial intelligence voice broadcast prompts and can adjust the volume at will,which is easy to use
Intelligent digestion timing: automatically start timing when the temperature rises to the set digestion temperature 5.
Full Chinese operation mode:in line with daily operation habits, more intuitive, more simple
The digestion temperature and timing time can be adjusted freely in a wide range
It has the function of delay protection and can preset the heating time, automatically stop heating, save energy consumption;
The device has six pre-stored digestion programs, which can be used directly without modification
| Technical parameters | |||
| Name | Project | COD high range | COD low range |
|
Colorimetric system |
Determination wavelength | 610±2nm | 420±2nm |
| Range of measurement | 2-15000mg/L | 2-150mg/L | |
| Accuracy of measurement | COD＜50mg/L, COD＞50mg/L, ≤±5% | ≤±10% | |
| Minimum detectability | 0.1mg/L | ||
| Time | 20 min | ||
| Batch processing | 16/3232 (optional) bottles of water | ||
| Repeatability | ≤5% | ||
| Resistance to chloride | [C1}1000mg/L:Unaffected [C1}4000mg/L(optional) | ||
| Light source life | 100,000 hours | ||
| Optical stability | ≤0.001A/20min | ||
| Colorimetric method | tube/dish colorimetry | ||
| Data storage | 900,000 | ||
| Display mode | 7 inch HD color LCD touch screen display, full Chinese display | ||
| Number of curve | 990 | ||
| Data transmission | USB | ||
| Way to remind | voice broadcast | ||
| Power supply mode | AC220V/50Hz | ||
| Parameter selection | auto switch with one click | ||
| Printing method | thermal printing | ||
| Dimension | 280*280*140mm | ||
| Digestion apparatus | Digestion temperature | 165℃±0.5℃ | |
| Digestion time | 10/15min (optional) | ||
| Timing switch | 4 | ||
| Dimension | 200*320*135 | ||
