Panel-mount Type Residual Chlorine Meter (Four-Wire Transmission)

HR-480 industrial residual chlorine meter takes sequential measurements of free residual chlorine, which is an indicator used in the inspection of the anti-bacterial properties of drinking water and swimming pools.
The sensor(RS-1) combined with uses a galvanic method with no drive section, making it highly maintainable, and producing stable measurements over a long period.

Measuring range

Free residual chlorine concentration: 0 - 2 mg/L


Division: Process Water
Manufacturing Company: HORIBA Advanced Techno Co., Ltd.
  • Ideal for managing water quality, for example of drinking water or swimming pools The HR-480 takes sequential measurements of free residual chlorine, which is an indicator used in the inspection of the anti-bacterial properties of drinking water and swimming pools.
  • Uses a galvanic cell method The galvanic cell method makes the sensors more maintainable than the polarographic method, meaning that there is no need to polish the sensors, allowing them to be used semi-permanently.
  • Can be installed on the same cell as pH electrodes, ORP electrodes and temperature sensors (Option: Sampling Rack SS-2, SS-3) As well as residual chlorine sensors, pH, ORP electrodes and temperature sensors can also be installed on the same cell, making it possible to construct a low-cost system.
  • Span correction is possible when measuring fluids with low concentrations Correction work can be carried out easily on-site, with no need to prepare a separate high-concentration correction fluid.
  • Uses lead-free solder To reduce the burden on the environment, lead-free solder has been used to mount the components on the printed circuit board.
Product nameIndustrial Residual Chlorine Meter
Measurement methodGalvanic cell method
Measuring range0 to 2 mg/L0.01 mg/L resolution (number of decimal places selectable between 1 and 2)
RepeatabilityWithin ±0.05 mg/L (with equivalent input)
LinearityWithin ±0.05 mg/L (with equivalent input)
4 mA to 20 mA DC, input/output isolated type
Maximum load resistance 900 Ω
Transmission output range: freely selectable within the measurement range.
Contact outputOutputs: 2 points
Alarm contact output (R1 and R2)
  Contact type: relay contact, SPDT (1c)
  Contact rating: 240 V AC, 3 A and 30 V DC, 3 A (resistance load)
  Contact function: selectable from upper/lower limit operation (ON/OFF control), alarm, and maintenance.
Calibration functionZero calibration (zero adjustment omissible)
Span calibration (calibration by compariing with DPD tester)
output hold feature
Previous value hold
Optional value hold
Selectable from the above (However, only the previous value hold is available in the
maintenance mode.)
Calibration function
Zero error
Sensitivity error
Outside of the measuring range
Converter error
−5℃ to 45℃
Relative humidity20% to 85% (without dew condensation)
−25℃ to 65℃
Power supplyRated voltage 100 V AC to 240 V AC, 50/60 Hz, 10 VA (max)
StructureIndoor-use panel installation type
    Panel case: ABS, Terminal: PBT
Panel: IP65 dust and water proof structure
Protective structurePanel: IP65 (IEC60529, JIS C0920)
Rear case: IP20
Terminal: IP00
Class II device (IEC61010-1)
Pollution level 2 (IEC61010-1)
CE MarkingEMC Directive: EN61326-1
Low Voltage Directive: EN61010-1
FCC RuleFCC Part15
48 (W) mm × 96 (H) mm × 115 (D) mm
Case depth: approx. 105 mm
MassApprox. 400 g
Compatible sensorRS-1
Measuring targetFree residual chlorine
Water sample
pH6 to pH8 (constant)
Temperature 0℃ to 40℃ (constant)

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