Field-installation type optical dissolved oxygen meter (DO meter)

Optical sensors improve ease of maintenance.

Ideal for the management of aeration tanks at facilities such as wastewater treatment plants and industrial wastewater treatment facilities. Optical sensors do not require concerns about electrolyte replacement or membrane breakage. The system also offers further enhanced functionality, such as automatic recognition of membrane-specific coefficients characteristics when the sensor cap is replaced.

Divisão: Process Water
Fabricante: HORIBA Advanced Techno Co., Ltd.

IC built-in memory sensor cap

Automatic recognition of membrane-specific coefficients eliminates the need to input them when replacing the sensor caps (fluorescent film).

Possible to be combined with a float-type holder

Self-cleaning action uses flow velocity of measured liquid preventing accumulated contamination.  The shape of the sensor prevents dirt and floc from clinging to the sensor part.

Possible to be combined with ultrasonic cleaners

Can be combined with an ultrasonic cleaner, which is effective for use in aeration tanks.  Furthermore, since the sensor is designed to be dropped into the holder, it offers ease of maintenance.

Strengths of the sensor

The sensor offers a longer lifespan compared to other measurement methods. Moreover, with an optical sensor, there are no concerns about membrane damage, and the membrane can be easily replaced by exchanging the entire cap. Three cleaning methods are available (water jet, air jet, and ultrasonic).

Indication converter specifications

Measuring methodOptical (fluorescent)
Measuring rangeDO: 0 to 20 mg/L      Resolution: 0.01 mg/L
Saturation: 0 to 200%    Resolution: 0.1%
Temperature: 0 to 50°C   Resolution: 0.1°C
RepeatabilityWithin ± 1% of full scale
LinearityWithin ±2% of full scale
2 points 4 mA to 20 mA DC output isolated type Maximum load resistance 900 Ω
 Range 1: DO concentration: Freely selectable within the measurement range
 Range 2: Temperature: Freely selectable within the range from -10.0 to 110.0°C
 Alarm: Burnout function (3.8 mA or 21 mA)
 Hold: Selectable from previous value hold, optional value hold
3 points Dry contact output Relay contact, SPDT (1c)
 Signal R1, R2: upper limit alarm, lower limit alarm,
        hold, Cleaning (selectable)
      FAIL : Alarm
 Control operation Control width: 0.02 to 4.00 mg/L (±0.01 to ±2.00 mg/L)
On cleaning
1 point Wet contact output (connecting power supply voltage output) Relay contact, SPST (1a)
 Contact function: Solenoid Valve Control
External input1 point Contact shape: Open connector dry ‘a’ contact
 Contact function: Cleaning Unit Control
Communication functionRS-485 2-line, insulated input/output (transmission output is not insulated)
compensation range
0 to 50°C
compensation device
Calibration methodAtmosphere span calibration, zero liquid (sodium sulfite) calibration, span liquid (atmosphere saturation liquid) calibration
Self-diagnosis functionCalibration error, sensor diagnosis error, converter alarm
Operating temperature range-20 to 55°C (Should not be frozen)
Power supply90 to 264 V AC 50/60 Hz Power consumption: 15 VA (max)
StructureIP65 : 50 A pole or wall mounting
Case: Aluminum alloy Mounting brackets, hood: SUS304
MassMain unit body: Approx. 3.5 kg   Hood, mounting brackets: Approx. 1 kg
Regulatory complianceCE marking, FCC
Compatible sensorDO-2000

*1     When extending the sensor cable, transmission cable, or contact input cable 30 m or more, the CE marking EMC directive surge test does not apply.
*2     An arrestor (inception voltage: 400 V) is mounted on the unit for transmission output, contact input, and communications. However, an optimal surge absorber should be installed on the connecting line depending on the surrounding environment, equipment setup, externally connected devices, etc.

Probe specifications

Measurement principlesOptics (fluorescence)
Sample water0 to 50°C
Wetted materialSUS316、NBR、PVC
Response time90% response: Within 30 s  95% response: Within 60 s
MassApprox. 3.0 kg (incl. 10 m cable)

Sensor cap specifications (replaceable)

Wetted materialNBR, PMMA
MassApprox. 5.0 g
Membrane memoryBuilt-in memory in the membrane unit, automatic recognition

Pedido de Informação

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