Feild-installation Type Residual Chlorine Meter (Four-Wire Transmission, Water flow beads)

HR-200 is connected to a residual chlorine sensor (RA-20), which allows the free residual chlorine concentration to be measured with high accuracy. It is sutable for waterworks, pool water sterilization, and desalination systems. The measurement method is a three-pole polarographic method, which enables continuous monitoring of residual chlorine concentrations without using reagents. Stable measurement over a long period was realized by physical polishing cleaning using beads.


Measuring range

Free residual chlorine concentration: 0 - 3 mg/L
Temperature: 0 -50 ℃


Abteilung: Process Water
Produktionsfirma: HORIBA Advanced Techno Co., Ltd.


  • Suitable for waterworks, pool water sterilization, and desalination systems
  • Long-term stable measurement with combination of bead cleaning and electrochemical cleaning



Measuring methodPolarography
Measuring rangeResidual Chlorine: 0 mg/L to 3 mg/L   Resolution: 0.01 mg/L
Temperature: 0 to 50˚C   Resolution: 0.1˚C
RepeatabilityResidual Chlorine:Within ±0.05 mg/L or less   Temperature: Within ±0.5˚C(for equivalent input)
LinearityResidual Chlorine:Within ±0.05 mg/L or less   Temperature: Within ±0.5˚C(for equivalent input)
Transmission outputTwo points 4 to 20 mA DC   Input/output insulation type   Maximum load resistance 900 Ω
Contact outputThree 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 inputTwo 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 capabilityRS-485   Two-wire input/output insulation type (not insulated from transmission output)
Temperature compensation range0 to 50°C
Ambient temperature0 to 55°C
Cleaning capabilityElectrochemical Cleaning between Cathode and Electrochemical cleaning electrode
Calibration methodZero calibration (Zero liquid calibration)
SPAN calibration(Compare to measurement value of DPD method, Including zero electric calibration)
Self-diagnosis functionCalibration error, Temperature sensor diagnostic error, Meter error
Power source90 V to 264 V AC, 50/60 Hz 35 VA (max.) when an automatic cleaner is connected.
ConstructionOutdoor 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
WeightApprox. 4.5 kg
Equipment protectedCE marking, FCC rules


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