Organic pollutant monitor

Long-term stable and high-precision measurements are achieved through our unique rotary cell length modulation method.

An organic pollutant monitor that applies HORIBA's proven and proprietary rotary cell length modulation method which has been developed over many years.  Suitable for use in monitoring organic pollutants at discharge points under the Total Pollutant Load Control System (TPLCS), organic matter measurement at water intake points for monitoring water quality, and monitoring organic substances in process lines (such as phenol meters).


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

Having a wide range, capable of use with high-concentration waste water and low concentration water as well as effluent water after treatment.

A single unit can cover a wide range from low to high concentrations.

Implementing a unique cell rotation mechanism that is not affected by contaminated samples

By performing zero-point checks through cell rotation to account for contamination effects from water quality, zero-point drift is eliminated.

Implementing a unique wiper method

Cell cleaning is continuously performed with a wiper, without interrupting the optical measurement path.  Therefore, there are no indication errors due to cell contamination and no indication difference before and after cleaning in the intermittent cleaning method.

Product nameOrganic Pollutant Monitor (UV meter)
Measurement itemUV absorbance, VIS absorbance, COD conversion concentration, TURB (turbidity) conversion concentration
Measurement principleDual optical path, Dual wavelength, rotary cell length modulation method
Measurement wavelengthUltraviolet: 253.7 nm, Visible light: 546.1 nm
Structure of analyzer unitCirculation type
Measurement range
(converted by cell 10mm)
UV absorbance/VIS absorbance
Full scale: 0.1 Abs to 5.0 Abs (setting by 0.1 Abs is possible)
Minimum scale0.0001 Abs (changeable to 0.001 Abs)
RepeatabilityWithin ±2.0% of full scale
(Within ±5.0% of full scale for 2.6 Abs to 5.0 Abs)
LinearityWithin ±2.0% of full scale
(Within ±5.0% of full scale for 2.6 Abs to 5.0 Abs)
StabilityWithin ±2.0%/24 h of full scale
(Within ±4.0%/24 h of full scale for 2.6 Abs to 5.0 Abs)
Response timeT90, within 1 minute (flow rate of approximately 5 L/min)
Cleaning method
(cleaning cycle)
Automatic cleaning by wiper (automatic continuous cleaning)
Display methodLCD display:
320 × 240 monochrome graphics LCD data display with dot backlighting (a touch-panel)
Display content:
UV absorbance, VIS absorbance, UV-VIS absorbance, COD conversion concentration, TURB (turbidity) conversion concentration
Calibration methodSolution calibration using zero solution and span solution (calibration solution in the ampoule)
(one-touch calibration is possible)
Sample water conditionTemperature: 2°C to 40°C (should not be frozen)
Flow rate of sample water: Min. 2 L/min, Max. 20 L/min
* Keep the unit warm (or preserve the heat) to ensure protection against frozen sample water in the cold weather.
Ambient temperature and
Ambient temperature: 0°C to 40°C, Ambient humidity: 85% or below
Analog outputPoint: 3
Type: arbitrary 3 items from UV absorbance, VIS absorbance, UV-VIS
absorbance, COD conversion concentration, and TURB (turbidity) conversion
concentration (selectable)
Specification: 4 mA to 20 mA DC or 0 mA to 16 mA DC, insulated output
(however, non-insulated among each channel)
Maximum load resistance: 600 Ω
Contact outputPoint: 6
Type: arbitrary 4 items from POWER OFF, MAINTENANCE (standard, fixed allocation)
ANALYZER ERROR (selectable)
Content: POWER OFF: when the power OFF occurred.
MAINTENANCE: at in-maintenance mode and calibration mode, and when maintenance switch is ON.
Specification: contact output without voltage, a contact
Contact rating: 125 V AC/0.3 A, 30 V DC/1 A
(however, for load resistance) each output COM-independent
Contact inputPoint: 2
Type: Float switch input, time adjustment input
Specification: contact input without voltage (open collector can be connected), insulated input
ON resistance: Max. 100 Ω, Open voltage: 5.5 V DC, Short circuit current:
Max. 10 mA
CommunicationInterface: RS-232C compliant
Communication speed: 19200 bps
Data memoryMemorize the data of measurement value of the measurement item in the main body.
Memorized data can be transferred to the CF card.
Memory interval: 1 minute or 1 hour
Memory time: on the hour every hour
Data memory time: interval of 1 minute: approximately 10 days
interval of 1 hour: approximately 1 year
* The latest data is memorized.
Light source/detectorLight source: low pressure mercury-vapor lamp, detector: silicon photo diode
Piping sockets
  • Sample inlet Rp-1/2 female
  • Bypass outlet Rc-1/2 female
  • Overflow outlet (1) Elbow fitting, 13A (nominal)
  • Overflow outlet (2) Elbow fitting, 20A (nominal)
  • Drain outlet Rc-1/2 female
  • Discharge Tube coupling, 50A (nominal)
StructureWeather-proofed for outdoor installation (equivalent to IP54)
Main material of each unitSUS, PVC, PP, CR, SiO2
Power100 V to 230 V AC ±10%, 50/60 Hz
Power consumption100 V to 120 V AC, Max. 45 VA
200 V to 230 V AC, Max. 60 VA
MassControl unit: approximately 5.0 kg
Analyzer unit: approximately 5.6 kg
DimensionControl unit: 240 (W) × 104 (D) × 320 (H) mm
Analyzer unit: 200 (W) × 180 (D) × 403 (H) mm
(Protruding portion are not included.)
Painting colorControl unit: Munsel 5PB 8/1
Conditions for installation
  • Flat and stable places free from strong vibration or shock
  • Places free from dirt or dust, or where no corrosive gases will be generated.
  • At the atmospheric pressure
  • Places not subject to direct sunlight
  • Places well-ventilated
  • Altitude of 2000 m or below

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