HORIBA HD-480 Panel-mount type dissolved oxygen meter (DO meter)

Model

HD-480

Measurement method

Galvanic cell method

Measuring range

• Dissolved oxygen 0 mg/L to 20 mg/L, 0.01 mg/L resolution

• Saturation 0% to 200%, 1% resolution

• Temperature 0℃ to 40℃, 0.1℃ resolution

Repeatability

Within ±0.5% of the full scale (by equivalent input)

Linearity

Within ±0.5% of the full scale (by equivalent input)

Transmission
output

• 4 mA to 20 mA DC, input/output isolated type

• Max. load resistance: 900 Ω

• Transmission output range: Freely settable within the measuring range

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 limit operation”, “lower limit operation”
   (ON/OFF control), “anomaly alarm”, “during maintenance”, and “temperature”

Calibration function

• Air calibration and solution calibration

• Salinity compensation (0.0% to 5.0%)

• Temperature calibration (two points)

Transmission output hold feature

Selectable from previous value hold, optional value hold or continuous (however,only the previous value hold is available in the maintenance mode)

Self-diagnosis function

• Calibration failure: Zero error and sensitivity error

• Sensor diagnosis: Short-circuit or disconnection of temperature sensor

• Measuring range error

• Product error