CODA-500

Automatic COD monitor

Compliance will be achieved with regulations and standards through a combination of the latest technology and traditional methods.

An automatic COD monitor with a fully automated JIS (Japanese Industrial Standards) based measurement method. We are focused on reducing running costs and maintenance costs.

Division: Water Pollution
Manufacturing Company: HORIBA Advanced Techno Co., Ltd.

Reducing life cycle costs

Reagent consumption has been reduced to 1/10 of our previous amounts. With the reagent delivery service, there is no need for reagent preparation. The effort and running costs associated with reagent replacement are reduced to approximately 1/2 compared to our previous amounts.

General specification Name of equipmentAutomatic 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
  •  100 V to 120 V AC: Approx. 250 VA
  •  120 V to 240 V AC: Approx. 350 VA
Installation conditions
  • Indoor installation type
  •  Transient overvoltage of main power source: Overvoltage category II (EN61010-1), pollution level 2
PerformanceMeasurement range
(Actual upper limit of measurement is half-scale of the range.)
  • 0 mg/L to 20 mg/L
  • 0 mg/L to 30/40/50/100/200/500/1000/2000 mg/L (1-dilution type)
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
StabilityZero 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 pointsStandard: 1
Optional: 2
Measuring rangeStandard: 1 range
Optional: 2 ranges
Heating methodDirect heating
End point detectionPotentiometric titration at constant current
Titration methodMicro syringe titration
Measurement interval60 minutes
Reagent cleaningCODA-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 temperature2℃ to 40℃
Ambient humidityRelative humidity: 85% max. (without condensation)
Power supply voltage
fluctuations
100 V to 240 V AC ±10%
Sample water
conditions
Temperature2℃ to 40℃ (without freezing)
Flow rateWhen 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 pointPiping length from main unit: Within 3 m
Blank
water
conditions
Supply methodStandard: Waterworks water
Optional: Supply from deionized water tank
Water quality*5Waterworks water without COD components
(hardness: 100 mg/L max.)
Water supply
pressure
100 kPa to 500 kPa (at the connection of the instrument inlet)
Consumption20 mL to 420 mL per measurement run (depends on the
measurement range and cleaning function setting).
Installation conditions
  • Well ventilated indoor location without exposure to direct sunlight
  • Flat and stable location with minimized vibrations and shocks
  • Atmosphere free from dust, mist, corrosive gas, etc.
Input/output
specification
DisplayColor LCD with touch panel
Analog
output
Number of pointsStandard: 3
Optional: 6
KindsStandard 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
DescriptionCOD concentration, time COD load, and time flow rate
Output impedance900Ωmax.
Contact
output
Number of pointsStandard: 14
Optional: 21
FormatNo-voltage contact output
KindsInsulated output
Output capacity250 V AC, 3 A
30 V DC, 3 A
(Only 30 V DC, 3 A are available for "Maintenance" contact.)
Status outputMeas., Cal., Standby, Cleaning, Blank Meas., Synchro. Idle 1,
Synchro. Idle 2, Maintenance, Power, etc.
Warning outputLimit 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 pointsStandard: 1
Optional: 2
KindsStandard: 4 mA to 20 mA DC input
Optional: 1 V to 5 V DC
DescriptionFlow signal (full-scale value may be specified freely)
Contact
input
Number of pointsStandard: 9
Optional: 17
FormatNo-voltage a-contact input (open collector is available)
KindsInsulated type input: common to (-) side
ON resistance100Ω max.
Open voltage26 V DC max.
Short-circuit
current
13 mA DC max.
FunctionsMeas. 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 capabilityCOD load calculation capability
Storage capabilityData retention for 1 year (measurement values)
External USB storage is available.
Communication capabilityStandard: RS-485
Optional: RS-232C
Communication protocolModbus
PrinterProvided (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 interval1 month or more.
Tap water20 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.

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