Products of chemical oxygen demand (COD) refers to strong acid conditions, with potassium dichromate as an oxidant when dealing with water the amount of oxidant consumed to oxygen mg / L to represent. Reflects the chemical oxygen demand by reducing substances in the water level of pollution, water reducing substances including organic matter, nitrite, ferrous salt, sulfur and so on. COD Cr is the implementation of emission control of one of the indicators. 
 Microwave digestion COD Tester, is by far the latest to monitor a variety of specialized wastewater, sewage and surface water chemical oxygen demand of the device. 
 Return than the standard COD method, microwave digestion method for COD reduction in reagent requirements, high resistance to chloride ion interference, digestion time is only 10 minutes, to save time, energy and water conservation and efficiency purposes, can be used as an equivalent method. 


 Microwave digestion works COD measuring device is the electromagnetic frequency 2450MH Z (known as the microwave) energy to heat the reaction solution, the role of high-frequency microwave energy, the reaction liquid molecules to produce high-speed friction movement, its temperature increases rapidly In addition, sealed digestion method to rapidly increase the internal pressure digestion tank to about 203kPa. So not only shorten the digestion time, but also can inhibit the oxidation of chloride ion is potassium dichromate, chlorine, mercury, if adding an appropriate amount of sulfuric acid as a masking agent, you can achieve the high-chlorine water in the COD determination. Free cooling water throughout the digestion process, reducing the cold water pipe installation and trouble without water. 
 Water samples under the control of the microcomputer, in strong acid solution, with a certain amount of potassium dichromate oxidation of reducing substances in water samples, excess potassium dichromate as an indicator to test the Spirit of ferrous, ferrous ammonium sulfate were titration, calculate the COD Cr values. Assay can also be used, directly measured at a wavelength of 600nm at the reaction solution of trivalent chromium concentration of water samples obtained COD Cr values. 

 Main parameters of technical indicators parameter range 

 Range COD Cr 10 ~ 3000mg / L (mg / L) 
 COD Cr> 3000mg / L (dilution assay) 
 Precision (domestic ten verify laboratory statistics) indoor relative standard deviation: ≤ 4.3% 
 The relative standard deviation between room: ≤ 5.0% 
 Accuracy of the determination results compared with the standard dichromate reflux method of 
 Linear correlation coefficient r> 0.999 
 Power microwave digestion, the maximum input power of 1200W 

 Power supply AC 220V, 50H Z 
 Ambient temperature 0 ~ 40 ℃ 
 Relative humidity less than 95% 
 Dimensions 537 × 403 × 319 (mm)