HORIBA’s long-selling water quality meter that excels in indoor applications.

Ideal for measuring the concentration of free residual chlorine in tap water, swimming pools, spas and similar environments.  By combining two methods, namely physical polishing cleaning using cleaning beads and electrochemical cleaning utilizing electrochemical reactions, long-term stable measurements can be achieved.



  • Measuring method: Polarography
  • Measuring range: Residual Chlorine: 0 mg/L to 3 mg/L   Resolution: 0.01 mg/L
    Temperature: 0 to 50˚C   Resolution: 0.1˚C
  • Repeatability: Residual Chlorine:Within ±0.05 mg/L or less   Temperature: Within ±0.5˚C(for equivalent input)
  • Linearity: Residual Chlorine:Within ±0.05 mg/L or less   Temperature: Within ±0.5˚C(for equivalent input)
  • Transmission output: Two points 4 to 20 mA DC   Input/output insulation type   Maximum load resistance 900 Ω
  • Contact output: Three points No-voltage contact output Relay contact, SPDT
    Contact capability R1, R2: Selectable from upper limit alarm, lower limit alarm, ON/OFF control, currently holding transmission output, and cleaning output.
    (opened at alarm operation, closed usually, closed at power-off)
    FAIL: Error warning (normally closed; open when an error occurs; open when the power is turned OFF)
  • Contact input: Two points Contact type: No-voltage a contact for open collector
    Contact capability: Input 1: External input for transmission holding
    Input 2: Flow switch input for interlock(Open due to decreased flow)
  • Communication capability: RS-485   Two-wire input/output insulation type (not insulated from transmission output)
  • Temperature compensation range: 0 to 50°C
  • Ambient temperature: 0 to 55°C
  • Cleaning capability: Electrochemical Cleaning between Cathode and Electrochemical cleaning electrode
  • Calibration method: Zero calibration (Zero liquid calibration)
    SPAN calibration(Compare to measurement value of DPD method, Including zero electric calibration)
  • Self-diagnosis function: Calibration error, Temperature sensor diagnostic error, Meter error.
  • Power source: 90 V to 264 V AC, 50/60 Hz 35 VA (max.) when an automatic cleaner is connected.
  • Construction: Outdoor installation type: IP65 Protection class
    Installation method: 50 A pole-mounted or wall-mounted
    Material of case: Aluminum alloy (coated with epoxy modified melamine resin)
    Material of mounting brackets: SUS304
  • Weight: Approx. 4.5 kg
  • Equipment protected: CE marking, FCC rules