HO-300 (Two-Wire Transmitter)


  • Redox potential measurement of various solutions
  • Suitable for aeration control of sewage treatment and neutralization of chemicals

Hergestellt von HORIBA Advanced Techno


Measuring method

Metal electrode method

Measuring range

ORP: -2,000 to 2,000 mV   Resolution: 1 mV
Temperature: 0 to 100C   Resolution: 0.1C


ORP: ±5 mV or less   Temperature: ±0.3˚C (for equivalent input)


ORP: ±5 mV or less   Temperature: ±0.3˚C (for equivalent input)

Transmission output

4 to 20 mA DC   Input/output insulated type
Maximum load resistance 600 Ω

Contact input

One point   Contact format: Non-voltage a contact
 Contact function: Transmission output is held for closed contact input.

Ambient temperature

-20 to 60˚C

Temperature measurement element

Pt 1000 (0˚C)
Positive temperature sensitive resistor element: 500 Ω (25˚C), 6.8 kΩ (25˚C), 10 kΩ (25˚C)

Calibration function

Manual adjustment (offset)   Correction (-200 to 200 mV)
Manual sensitivity correction (0.500 to 1.500)

Self-diagnosis function

Electrode diagnosis error, Transmitter malfunction

Power supply

24 V DC (operational voltage range: 21 V to 32 V DC)
Power consumption 0.6 W or less


Outdoor installation type: IP65 protection level
Mounting method: 50A pole or wall mounted
Case: Aluminum alloy
Mount fitting/hood: SUS304


Approx. 4 kg

Equipment protected

CE marking, FCC rules