Principle of Operation:
At 100°C, the COD-203A COD analyzer uses the acidic potassium permanganate titration method or the alkaline potassium permanganate titration method, performing chemical oxygen demand measurement by redox potentiometric titration.
Industries of Application:
The HACH COD-203A COD analyzer can perform point-source monitoring of CODMn (permanganate index) in surface water, drinking water, and raw water.
Instrument Features:
● The COD-203A COD analyzer uses the acidic potassium permanganate titration method, suitable for low-range COD point-source online monitoring, providing more accurate measurement results.
● The COD-203A COD analyzer is equipped with an LCD display and supports a Chinese operation interface, making it intuitive and convenient.
● The COD-203A COD analyzer operates reliably with low maintenance. It does not use solenoid valves; the tubing is backflushed before each measurement to avoid pipe blockage; an air nozzle is used to prevent blockage of the titration tube.
● Chemical oxygen demand measurement data can be stored for 14 days, facilitating historical data management and retrieval
Technical Specifications
Measuring range: 0…20mg/L; 0…2000mg/L
Measurement cycle: 1 hour, 1…6 hours freely selectable
Display: LCD liquid crystal display
Repeatability: At 0…20mg/L, ± 1% FS
At 20…200mg/L, ± 2% FS
Above 200mg/L, ± 5% FS
Stability: Zero drift ± 3% FS
Span drift At 0…20mg/L, ± 3% FS
At 20…200mg/L, ± 4% FS
Above 200mg/L, ± 5% FS
Operating environment: Indoor installation. Temperature, 5…40 °C, humidity, below 85%
Sample conditions: Temperature, 2…40 °C
Pressure, 20…50kPa
Consumption, 500mL per measurement
Analog output: 4…20mA, maximum load 600Ω
Power supply: 220VAC, 50/60HZ
Power consumption: Maximum 550VA, average 200VA
Data communication: RS485 serial port
Dimensions: 600 × 600 × 1600mm
Weight: 150Kg
Spare Parts
| Spare Part Order No. | Instrument Model | Chinese Description | English Description |
|---|---|---|---|
| 105H021 | COD-203A COD analyzer | Float Switch | Float Switch |
| 107A233 | COD-203A COD analyzer | Induction Motor | |
| 108A565 | COD-203A COD analyzer | SSR | |
| 113D314 | COD-203A COD analyzer | Platinum Temperature Sensor | |
| 115A021 | COD-203A COD analyzer | O-ring for Float | |
| 115A060 | COD-203A COD analyzer | Check Valve O-ring P26 | O-ring |
| 115A119 | COD-203A COD analyzer | O-ring | |
| 115A298 | COD-203A COD analyzer | O-ring G60 *FKM | O-ring G60 *FPM |
| 115A352 | COD-203A COD analyzer | O-ring | |
| 116C008 | COD-203A COD analyzer | Silicon Tube φ6 xφ 8 | Silicon Tube 6 x 8 |
| 1.16E+25 | COD-203A COD analyzer | Uni Tube φ5 x 9 | Uni Tube 5 x 9 |
| 1.16E+34 | COD-203A COD analyzer | Hose φ10 x φ14.5 | Uni Tube 10 x 14.5 |
| 116E652 | COD-203A COD analyzer | Tube | |
| 117B001 | COD-203A COD analyzer | Sleeve (Z-union 3 PP.) | Sleeve for Z-union 3 P.P. |
| 125A114 | COD-203A COD analyzer | P1 Pump Diaphragm (APN-085LV) | Diaphragm for P1(APN-085LV) |
| 125A115 | COD-203A COD analyzer | Pump | |
| 126A135 | COD-203A COD analyzer | Solenoid Valve (SV5~10,12~14) | Solenoid Valve(SV5,6,10,14,17,19) |
| 126A282 | COD-203A COD analyzer | Solenoid Valve (SV2~4,7) | Solenoid Valve for SV2 to 4 |
| 126B436 | COD-203A COD analyzer | Check Valve | Check valve |
| 126B834 | COD-203A COD analyzer | Pinch Valve (PV2, 10~12 DC24V) | Pinch Valve for PV2, 10 to 12 DC24V |
| 126D572 | COD-203A COD analyzer | Pressure Reducing Valve | |
| 133B198 | COD-203A COD analyzer | Band Heater | Band Heater |
| 134C135 | COD-203A COD analyzer | Switching Power Supply | |
| 134C297 | COD-203A COD analyzer | Touch Screen | |
| 136A022 | COD-203A COD analyzer | Filter (Mini trap filter) | Filter Mesh PE 70 |
| 136A075 | COD-203A COD analyzer | Activated Charcoal | Activated Charcoal (GW-30 500g) |
| 136A791 | COD-203A COD analyzer | Air Pump Muffler | Muffler |
| 143C065 | COD-203A COD analyzer | Potassium Sulfate (Special Grade) 500g | Potassium sulfide (Special Grade) 500g |
| 40121000 | COD-203A COD analyzer | Check Valve Rubber Seal | |
| 43133400 | COD-203A COD analyzer | Stirring Bearing | |
| 43705300 | COD-203A COD analyzer | Reaction Vessel Shaft | |
| 45918400 | COD-203A COD analyzer | Electrode Fixing Cover | |
| 53080700 | COD-203A COD analyzer | Rubber Tube | |
| 54173200 | COD-203A COD analyzer | 5L Reagent Container | |
| 54173400 | COD-203A COD analyzer | Packing FPM | |
| 59584800 | COD-203A COD analyzer | Electrode Packing | electrode packing *FPM |
| 61109200 | COD-203A COD analyzer | Filter | |
| 63634500 | COD-203A COD analyzer | 2L Plastic Container Assy | |
| 63634900 | COD-203A COD analyzer | Sinker (Weight) | |
| 68236200 | COD-203A COD analyzer | Receiver Tank | |
| 68922100 | COD-203A COD analyzer | Measuring Tube 1 | Measuring Tube No.1 |
| 68922200 | COD-203A COD analyzer | Measuring Tube 2 | Measuring Tube No.2 |
| 7033201K | COD-203A COD analyzer | SV8 Assy | |
| 7033290S | COD-203A COD analyzer | Pressure Reducing Valve S. Assy | |
| 7033540S | COD-203A COD analyzer | Cover Assy | |
| 7033560K | COD-203A COD analyzer | COD-203 Adjustment Tank Assy | |
| 7033571K | COD-203A COD analyzer | Receiver Tank Assy | |
| 71476500 | COD-203A COD analyzer | Main Body | |
| 7147660K | COD-203A COD analyzer | Filter Inner Cover Assy | |
| 7294350K | COD-203A COD analyzer | SV11 Assy | SV11 Assy |
| X0864800 | COD-203A COD analyzer | Stirring Bar | |
| XC885032 | COD-203A COD analyzer | Silicone Oil (5mL) | Silicone Oil(KF-96H-10000CS 5mL) |
| 143B004 | COD-203A COD analyzer | Potassium Permanganate (Special Grade) 500g | Potassium permanganate (Special Grade) 500g |
| 143C072 | COD-203A COD analyzer | Sodium Oxalate (Special Grade) 500g | Sodium Oxalate (Special Grade) 500g |
Ordering Guide
Standard configuration includes: main unit, operation manual, installation accessories, etc.
Suitable for surface water and tap water industries:
Order No. Measuring range
COD203A-1-2C12A11AY0011 0-20mg/L
COD203A-1-2C12A11CY0011 0-40mg/L
Suitable for seawater measurement: (temporarily unavailable for sale)
Order No. Measuring range
COD203A-1-2C12B11AY0011 0-20mg/L
COD203A-1-2C12B11CY0011 0-40mg/L
Source: Public information from the HACH water quality website
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