Panel-mount Type ORP Meter (Four-Wire Transmission)

The HO-480 industrial ORP meter is an ORP converter for measuring the oxidation-reduction potential of all types of solvent.
Being combined with a lead-free sensor, it makes measurements in a way that is kind to the environment.

Measuring range

0 - ±2000 mV

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


  • Includes a sensitivity correction function
    It is possible to compensate for changes in the sensitivity of the ORP electrodes.
  • A line-up of lead-free ORP electrodes
    Not only the glass body, but almost all sections of the ORP electrodes, including lead wires and soldered junctions are lead free.
  • 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 nameORP meter
Measuring range±2000 mV: resolution of 1 mV
RepeatabilityWithin ±5 mV (method by reference voltage input)
LinearityWithin ±5 mV (method by reference voltage input)
4 mA to 20 mA DC: input/output isolated type
Maximum load resistance: 900 Ω
Transmission output range: Free setting within the measuring 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 under maintenance.
output hold feature

Selectable function

  • Holding at the latest value
  • Holding at the preset value
  • Real data output without holding
    (In the maintenance mode, the latest value is held.)
  • 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
Class II device (IEC61010-1)
Pollution level 2 (IEC61010-1)
CE MarkingEMC Directives EN61326-1
Low Voltage Directive EN61010-1
RoHS Directive: EN50581
Class A, Industrial electromagnetic environment
  Immunity (Industrial electromagnetic environment)
  Noise increase ±0.2 pH or less
FCC RuleFCC Part15
48 (W) mm × 96 (H) mm × 115 (D) mm
Case depth: approx. 105 mm
MassApprox. 400 g

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