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〈Catalog〉Automatic COD Monitor CODA-500
| General specification | Name of equipment | Automatic COD monitor | |
|---|---|---|---|
| Model | CODA-500 | ||
| Object | COD concentration in water | ||
| Dimensions | 600 (W) mm × 510 (D) mm × 1600 (H) mm*1 | ||
| Mass | Approx. 150 kg | ||
| Power source | 100 V to 240 V AC ±10%, 50 Hz/60 Hz | ||
| Power consumption |
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| Installation conditions |
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| Performance | Measurement range (Actual upper limit of measurement is half-scale of the range.) |
| |
| Reproducibility (with standard solution for glucose) | 20 mg/L: Within ±1% of full-scale value 30 mg/L to 500 mg/L: Within ±2% of full-scale value 1000 mg/L to 2000 mg/L: Within ±5% of full-scale value Optional specification*2: Within ±5% of full-scale value | ||
| Stability | Zero drift (for 24 h) | 20 mg/L: Within ±3% of full-scale value 30 mg/L to 500 mg/L: Within ±4% of full-scale value 1000 mg/L to 2000 mg/L: Within ±5% of full-scale value Optional specification*2: Within ±5% of full-scale value | |
| Span drift (for 24 h, with standard solution for glucose) | 20 mg/L: Within ±3% of full-scale value 30 mg/L to 500 mg/L: Within ±4% of full-scale value 1000 mg/L to 2000 mg/L: Within ±5% of full-scale value Optional specification*2: Within ±5% of full-scale value | ||
| Measuring principle*3 | CODA-500-A (acidic method) | Acid potassium permanganate method at 100℃ (based on JIS K 0806) | |
| CODA-500-B (alkaline method) | Alkaline potassium permanganate method at 100℃ | ||
| CODA-500-C (acidic method) | Acid potassium permanganate method at 100℃ (based on JIS K 0806) With reagent cleaning function | ||
| Number of measurement points | Standard: 1 Optional: 2 | ||
| Measuring range | Standard: 1 range Optional: 2 ranges | ||
| Heating method | Direct heating | ||
| End point detection | Potentiometric titration at constant current | ||
| Titration method | Micro syringe titration | ||
| Measurement interval | 60 minutes | ||
| Reagent cleaning | CODA-500-A, CODA-500-B: Not available CODA-500-C: Available | ||
| Method without adding a silver nitrate solution*4 | Available (by selecting this method when the chloride ion concentration is low) | ||
| Measuring conditions | Ambient temperature | 2℃ to 40℃ | |
| Ambient humidity | Relative humidity: 85% max. (without condensation) | ||
| Power supply voltage fluctuations | 100 V to 240 V AC ±10% | ||
| Sample water conditions | Temperature | 2℃ to 40℃ (without freezing) | |
| Flow rate | When the overflow tank (optional) is used 0.5 L/min to 5 L/min (depends on the overflow tank type) | ||
| Chloride ion concentration (for acidic method) | CODA-500-A: Up to 1 time the full-scale value CODA-500-C: Up to 100 times the full-scale value (maximun)*6 (The alkaline method is not influenced by chloride ion concentration. For more than 100 times the full-scale value, select the alkaline method.) | ||
| Sampling point | Piping length from main unit: Within 3 m | ||
| Blank water conditions | Supply method | Standard: Waterworks water Optional: Supply from deionized water tank | |
| Water quality*5 | Waterworks water without COD components (hardness: 100 mg/L max.) | ||
| Water supply pressure | 100 kPa to 500 kPa (at the connection of the instrument inlet) | ||
| Consumption | 20 mL to 420 mL per measurement run (depends on the measurement range and cleaning function setting). | ||
| Installation conditions |
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| Input/output specification | Display | Color LCD with touch panel | |
| Analog output | Number of points | Standard: 3 Optional: 6 | |
| Kinds | Standard 4 mA to 20 mA DC, 0 mA to 16 mA DC (4 mA to 20 mA DC is set at the factory. 0 mA to 16 mA DC is selectable on the screen.) Optional: 0 mA to 16 mA DC, 0 V to 1 V DC, and 1 V to 5 V DC | ||
| Description | COD concentration, time COD load, and time flow rate | ||
| Output impedance | 900Ωmax. | ||
| Contact output | Number of points | Standard: 14 Optional: 21 | |
| Format | No-voltage contact output | ||
| Kinds | Insulated output | ||
| Output capacity | 250 V AC, 3 A 30 V DC, 3 A (Only 30 V DC, 3 A are available for "Maintenance" contact.) | ||
| Status output | Meas., Cal., Standby, Cleaning, Blank Meas., Synchro. Idle 1, Synchro. Idle 2, Maintenance, Power, etc. | ||
| Warning output | Limit warnings (COD Hi limit, Flow limit, and COD Hi Load), COD H.Hi limit, Sample Lack, Total Alarm 1 to 6, various gauge errors, etc. (optional: Lack Reagent) | ||
| Analog input | Number of points | Standard: 1 Optional: 2 | |
| Kinds | Standard: 4 mA to 20 mA DC input Optional: 1 V to 5 V DC | ||
| Description | Flow signal (full-scale value may be specified freely) | ||
| Contact input | Number of points | Standard: 9 Optional: 17 | |
| Format | No-voltage a-contact input (open collector is available) | ||
| Kinds | Insulated type input: common to (-) side | ||
| ON resistance | 100Ω max. | ||
| Open voltage | 26 V DC max. | ||
| Short-circuit current | 13 mA DC max. | ||
| Functions | Meas. Start, Cal. Start, Cleaning Start, Blank meas. Start, Modify Date, Samp. Lack, Line Select, Flow Mainte, Flow Err., Flow Power OFF, and Flow No Drain | ||
| Load calculation capability | COD load calculation capability | ||
| Storage capability | Data retention for 1 year (measurement values) External USB storage is available. | ||
| Communication capability | Standard: RS-485 Optional: RS-232C | ||
| Communication protocol | Modbus | ||
| Printer | Provided (58 mm); with automatic take-up device | ||
| Reagent consumption *7 | Potassium permanganate Reagent A | 2 mL per measurement run | |
| Sodium oxalate Reagent B | 1 mL per measurement run*8 | ||
| Sulfuric acid solution Reagent C | 1 mL per measurement run | ||
| Silver nitrate solution Reagent D | 0.5 mL per measurement run (used for acidic method) | ||
| Sodium thiosulfate solution Reagent E | 2 mL per measurement run (used for reagent cleaning function) | ||
| Sodium hydroxide solution Reagent F | 1 mL per measurement run (used for alkaline method) | ||
| Reagent replacement interval | 1 month or more. | ||
| Tap water | 20 mL to 420 mL per measurement run (depends on the measurement range) | ||
*1: Channel-based compatibility with the former CODA-200 series products is available (standard).
*2: This means the optionally addable specifications such as 2-point measuring, 2 ranges and reagent line cleaning,and also means using the reagent cleaning function of CODA-500-C.
*3: To be specified when you place an order.
*4: If silver nitrate is not used, the performance in the specifications is not warranted.
*5: If tap water is used, first perform flushing for about 30 minutes and then send tap water to the CODA-500.For the version using a tank, use deionized water of 10 mS/m (=1.0 μS/cm) maximum.
*6: When the reagent cleaning function is not used, the concentration is up to 1 time the full-scale value. The setting of reagent cleaning function can be switched depending on the chloride ion concentration in the sample water.
*7: Use the reagents designated by our company. If any other reagents are used, no measured values are warranted.When reagent cleaning function is set, reagent consumption may grow.
*8: Use sodium oxalate for the oxygen method or sodium oxalate containing 0.1 g/L manganese sulfate for the alkaline method.
The total volume control of water quality at companies which discharge waste water to a closed water area is implemented by the environmental agency. This regulation requires using a conversion equation for the method of obtaining the correlation between the values measured with an automatic COD monitor and those (by the designated measurement method) measured through the manual analysis specified in 17 of JIS K 0102. Before use, conduct the manual analysis and enter the conversion factor to the CODA-500.