Industrial dissolved oxygen analyzer (Four-Wire Analyzer)

Realizes both the cartridge method membrane replacement and the membrane internal liquid replacement regeneration system Responds to a wide range of measurements(boiler water/rivers/aeration treatment, etc.)

Division: Process Water
Manufacturing Company: HORIBA Advanced Techno Co., Ltd.
Combined sensor5700 A optical DO sensor
Combined probeDO-2000
Measurement rangeDissolved oxygen concentration:
 0 mg/L to 20 mg/L (Display range: 0 mg/L to 22 mg/L)
 Display resolution: 0.01 mg/L
Saturation ratio:
 0% to 200% (Display range: 0% to 200%)
 Display resolution: 0.1%
 0°C to 50°C (Display range: -10°C to 110°C)
 Display resolution: 0.1°C
Transmission outputNumber of output: 2
(The negative terminals for transmission outputs are internally connected at the same electric potential)
Output type: 4 mA to 20 mA DC: input/output isolated type
Load resistance: Maximum: 900 Ω
Contact outputNumber of output: 3
Output type: No-voltage contact output
Contact type: Relay contact; SPDT (1c)
Output capacity: 250 V AC 3 A, 30 V DC 3 A (resistance load)
Cleaning outputNumber of output: 1
Output type: AC power control output ( Applied power supply voltage)
Contact type: Relay contact; SPST (1a)
Output contact capacity: 250 V AC 3 A, 30 V DC 3 A (resistance load)
External instrument: Solenoid valve for cleaning control
Contact inputNumber of input: 1
Contact type: No-voltage "a" contact for open collector
Communication functionCommunication type: RS-485
Signal type:
 2 wire system, isolated from the input circuit
 Not isolated from transmission circuit
Temperature compensationTemperature compensation range: 0°C to 50°C
Temperature calibration: 1 point calibration comparing to reference thermometer
CalibrationCalibration method:
 ・Span calibration in the air
 ・Zero: Sodium sulfite solution
 ・Span: Air or DO saturated water
Self-checkCalibration error
Electrode diagnostic error
Meter error
Operating temperature range-20°C to 55°C (without freeze)
Power supplyPower supply voltage range: 90 V to 264 V AC 50/60 Hz
Power consumption: 20 VA(max)
Compatible standardsCE marking, FCC Rules
StructureInstallation: Outdoor installation type
Installation method: Mounted on 50A pole or wall
Protection code: IP65 IEC60529, JIS C0920
Case material: Aluminum alloy (coated with epoxy-denatured melamine resin)
External dimensions180 (W) x 155 (H) x 115 (D) mm (excluding the fittings)
MassMain body: Approx. 3.5 kg; cover and fittings: Approx. 1 kg

Note 1:
The standard for effect on the reading by the electromagnetic field of the radiated radio frequency and by the conducted interference is within the measured dissolved oxygen value ± 0.4 mg/L.

Note 2:
When the sensor cable, the transmission cable, or the contact input cable is extended by 30 m or more, the surge test under the EMC Directive for CE marking is not applied.

Note 3:
An arrester (spark over voltage: 400 V) is implemented for transmission output, contact input, and communication. However, use a most suitable surge absorption element on the connection lines in accordance with the ambient environment, the situation of equipment installed, and the externally connected equipment.


Product nameOptical DO probe
Measuring methodOptical sensor
Measurement rangeDissolved oxygen: concentration 0 mg/L to 20 mg/L
Saturation range: 0% to 200%
Temperature: 0°C to 50°C
MaterialSUS316, NBR, PVC
Measurement conditionSample pressure: 0 MPa to 1.0 MPa
Operating temperature range0°C to 50°C
External dimensionsΦ43×L230 mm
MassApprox. 3.0 kg


Product nameOptical DO sensor
MaterialNBR, PMMA
MassApprox. 1.5 kg (with 10 m cable)
MemoryEmbeded memory, Automatic data translat

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