HORIBA CODA-500 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)