HORIBA HO-300 Field-installation type ORP meter

Model

HO-300

Combined sensor

ORP electrode

Measurable
range

ORP

−2000 mV to 2000 mV (display range: −2200 mV to 2200 mV)

Temperature

0℃ to 100℃

• Display range :−10℃ to 110℃
  (the sensor types are detected automatically)

• Display range :−20℃ to 130℃
  (the sensor types are input by manually)

Display
resolution

ORP

1 mV

Temperature

0.1℃

Performance

ORP

Repeatability

Within ±5mV (response for equivalent input)

Linearity

Within ±5mV (response for equivalent input)

Temperature

Repeatability

±0.3℃ (response for equivalent input)

Linearity

±0.3℃ (response for equivalent input)

Transmission
output

Output type

4 mA to 20 mA DC: input/output insulation type

Load resistance

Max.: 600Ω (case of 24 V DC power supply)*¹

Linearity

Within ±0.08 mA (output only)

Repeatability

Within ±0.02 mA (output only)

Output range

ORP: Selection from preset ranges or free range input within measuring range.

Occasional out for error

Hold or burnout to either 3.8 mA or 21 mA

Transmission hold

In the maintenance mode, transmission signal is held at the latest value or preset value.
In the calibration mode, transmission signal can be alive or held.

Contact input

Number of input points

1

Contact type

No-voltage a-contact

Conditions

ON resistance: 40 Ω
Open voltage: 1.2 V
Short-circuit current: 21 mA DC max.

Contact function

External input for transmission holding.

Temperature
measurement

Applicable temperature
element

Platinum resistor: 1 kΩ (0℃)

Positive relation resistor with temperature:
500 Ω (25℃), 6.8 kΩ (25℃), 10 kΩ (25℃)

Element selection method

Automatic temperature sensor type detection or manual selection (no temperature element is selectable)

Calibration

ORP adjust function

Adjust (offset adjustment): −200 mV to 200 mV
Span sensitivity correction: 0.500 to 1.500

Temperature calibration

1 point calibration comparing reference thermometer

Self-check

Calibration error

Temperature calibration error
Out of temperature calibration range (for ORP sensor with RTD).

Electrode diagnostic error

Reference electrode impedance error (only applicable for differential circuit mode with a liquid contact electrode)
Temperature sensor short-circuit, temperature sensor disconnection, and out of the temperature measurement range

Converter error

CPU, ADC, and memory errors