CODA-500 Automatic COD monitor

Description

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.

eneral 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
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
Performance Measurement 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
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
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 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)