COD Online Monitor - COD Tester

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Shanghai Kuosi Electronic Co., Ltd.

Shanghai, China

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Chemical oxygen demand ( COD ) is a chemical method to measure the amount of reducing substances that need to be oxidized in a water sample.

Under certain conditions, the amount of oxidant consumed by oxidizing reducing substances in 1 liter of a water sample is used as an indicator, which is converted into the milligrams of oxygen required for each liter of water sample after all the oxidation, expressed in mg/L .

It reflects the degree of contamination of water by reducing substances.

This indicator is also used as one of the comprehensive indicators of the relative content of organic matter.
COD online monitor - COD analyzer performance characteristics

The digestion and colorimetry of the instrument are completed in one body, the structure is simple and reliable, and the possibility of errors is reduced.
Adopt imported modified PTFE transparent hose, the diameter of which is greater than 1.5mm, which reduces the probability of water sample particle blockage.
It can automatically clean the sampling pipe to prevent the formation of algae or biofilm.
After an abnormal reset and power failure, the instrument automatically discharges the residual reactants in the instrument and automatically returns to its working state.
Low failure rate, less maintenance, and less reagent consumption.
Intelligent fault self-diagnosis function, alarm prompt, instrument management, and maintenance are very convenient.
Using multi-channel valves, strong anti-corrosion performance, long service life, safety, and reliability.

                                                            model
                                                            QZ3000
                                                        
                                                            other
                                                            Abnormal alarm and power failure will not lose data; touch screen display and command input; After abnormal reset and power failure, the instrument automatically discharges the residual reactant in the device and automatically restores the working state
                                                        
                                                            power supply
                                                            AC220 ± 10%V , 50 ± 10%Hz , 5A
                                                        
                                                            size
                                                            Height 1500 × Width 550 × Depth 450 ( mm )
                                                        
                                                            Environmental requirements
                                                            Recommended temperature +5~28 ℃; humidity ≤ 90% (non-condensing)
                                                        
                                                            MTBF
                                                            ≥ 720h/ time
                                                        
                                                            Comparison of actual water samples
                                                            Error≤± 10%
                                                        
                                                            Switch
                                                            6 groups of relay control, capacity 220VAC/2A
                                                        
                                                            Analog output
                                                            2 channels 4~20mA
                                                        
                                                            Signal interface
                                                            RS232 or RS485
                                                        
                                                            Maintenance Cycle
                                                            Usually once a month, about 30min each time
                                                        
                                                            Calibration cycle
                                                            1~99 days, adjustable at any interval at any time
                                                        
                                                            Correction
                                                            The instrument can periodically perform sensitivity and zero calibration
                                                        
                                                            The sampling period
                                                            Time interval ( 20~9999min can be adjusted arbitrarily) and whole point measurement mode
                                                        
                                                            Measurement period
                                                            The minimum measurement period is 40min , and the digestion time can be arbitrarily modified within 5~120min according to the actual water sample .
                                                        
                                                            Repeatability  error
                                                            ≤± 10%
                                                        
                                                            Accuracy
                                                            Indication error ≤± 10%
                                                        
                                                            Measuring range
                                                            10~2000mg/L COD
                                                        
                                                            Method basis
                                                            Standard GB11914-89 "Water Quality - Determination of Chemical Oxygen Consumption - Dichromate Method"

It is suitable for wastewater with chemical oxygen demand in the range of 10 ~ 2000mg/L and chloride concentration lower than 2.5g/L Cl ¯. According to the actual requirements of users, it can be applied to wastewater with chloride concentration lower than 20g/L Cl ¯.
On-line monitoring of industrial pollution source wastewater
On-line monitoring of industrial process water
On-line monitoring of inlet and outlet water quality of municipal sewage treatment plants