Industrial ORP meter HO-480


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.


  • 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.

Manufactured by HORIBA Advanced Techno


Product name

Industrial ORP meter



Measuring range

±2000 mV: resolution of 1 mV

Transmission output

4 mA to 20 mA DC, input / output isolated type
Maximum load resistance 900 Ω
Transmission output range: freely selectable within the measurement range


Within ±5 mV of the full scale (by equivalent input)


Within ±5 mV of the full scale (by equivalent input)

Contact output

Outputs: 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 function

Sensitivity compensation
Adjust: ±200 mV
Span variable range: 50.0 % to 150.0 %

Transmission output
hold function

·Previous value hold
·Optional value hold
Selectable from the above (However, only the previous value hold is available in the maintenance mode.)

Self-diagnosis function

·Outside of the measuring range
·Converter error

Power supply

Rated voltage 100 V AC to 240 V AC, 50/60 Hz, 10 VA (max)


Indoor-use panel installation type
Panel: IP65 dust and water proof structure

Protective structure

Panel: IP65 (IEC60529, JIS C0920)

Conforming standards

CE Marking
FCC Rule

External dimensions

48 (W) mm x 96 (H) mm x 115 (D) mm
Case depth: approx. 105 mm


Approx. 400 g