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Process COD analyzer EZ7000 - EZ7004 (dichromate method)
SKU: EZ7000.990A1C02
Manufacturer: Hach
Availability: Order only
The EZ700X Series COD Analyzers are single parameter titrators. The sampling line transfers the sample to the analyzer. The analyzer uses pumps, valves, and syringes to move the sample and reagents into a measuring cell on the analytical panel. When the measurement cycle is complete, the analyzer removes the sample through the drain line. The analysis results are displayed on the display of the data processing panel.
Includes mounting brackets, fittings, reagent containers, electrode, and user manual.
Description Specifications Recommended products
Description
Description
Ordering information
- EZ7000.990A1C02 - model EZ7000 measuring range 5 - 100 mg/l O2
- EZ7001.990A1C02 - model EZ7001 measuring range 40 - 500 mg/l O2
- EZ7002.990A1C02 - model EZ7002 measuring range 60 - 1000 mg/l O2
- EZ7003.990A1C02 - model EZ7003 measuring range 80 - 1500 mg/l O2
- EZ7004.990A1C02 - model EZ7004 measuring range 600 - 10,000 mg/l O2
EZ700X Online Analyzer Method for Determination of COD in Wastewater
Determination of COD concentration in a wastewater sample is based on titration with solution of ammonium-iron (II) sulfate (Mohr's salt). During the oxidation phase, organic compounds are oxidized and converted to carbon dioxide, nitrates and water, while potassium dichromate is converted to chromium (III). The amount of titration solution used is used to calculate the COD concentration in the sample.
Analysis steps
The sample is diluted and mixed with dichromate solution (K2Cr2O7) and sulfuric acid solution (H2SO4). The solution is heated to 135 °C for 15 minutes to oxidize the organic matter. After oxidation, titration is carried out with a solution of ammonium-iron (II) sulfate (Mohr's salt). The amount of titrant is used to calculate the COD concentration in the sample.
Chemical Oxygen Demand Analyzers Specifications
- Measurement method: Redox titration after oxidation with acidic potassium dichromate solution according to ISO 6060 method
- Detection limit: ≤ 5 mg/l
- Interference: chloride> 1 g/L, inorganic reducing agents such as nitrates, sulfides and iron (II) increase the result, aromatic hydrocarbons and pyridine are not oxidized to any appreciable degree. Some highly volatile organic compounds may not oxidize due to evaporation. Open chain aliphatic compounds are effectively oxidized with a silver sulfate / sulfuric acid solution. Fats, oils, proteins, surfactants and tar.
- Cycle time: 40 minutes including 30 minutes oxidation time
- Automatic cleaning: Yes
- Calibration: automatic, 2 points
- Ambient temperature: 10 - 30 °C ± 4 °C at 5 - 95% RH (no condensation)
- Reagent Requirements: Store 10 to 30 °C
- Flow rate: 100 - 300 ml/min
- Sample temperature: 10 - 30 °C
- Sample quality: maximum particle size 100 μm,
- Power supply: 230 V AC, 50/60 Hz; 120 VAC, 50/60 Hz; Max. power consumption: 440 VA
- Analog outputs: Active 4-20 mA max. Load 500 Ohm, standard 1, max. 8 (option)
- Digital outputs: optional: Modbus (TCP / IP, RS485)
- Material: folding part (hinges): Thermoform ABS; door: plexiglass; housing: galvanized steel, powder coated
- Dimensions (H x W x D) 690 mm x 465 mm x 330 mm
- Weight 25 kg
Specifications
| Application area | Wastewater, Treatment facilities, Process control |
| Type | Industrial |
| Industry | Ecology, Municipal |
| Parameters | COD |
| Measurement Range | 5 - 10000 mg/L O2 |
| Measurement method | Titrimetric |
| Method | Dichromate |
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