Optical Dissolved Oxygen Meter
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OD-10 Optical Dissolved Oxygen Meter

Measurement of dissolved oxygen for aeration flow rate control at sewage treatment plants and monitoring of water quality at rivers,lakes,and etc.

POINT 1
Light emission lifetime evaluation system to ensure long-term stable measurement without being affected by temporal change of the light source.
POINT 2
No incident flow is required because the OD-10 optical system does not consume oxygen during measurement.
POINT 3
Easy maintenance with no use of electrolyte solution.
POINT 4
No re-configuration of the detector is needed when replacing the sensing cartridge, because the characteristic parameters of sensing membrane are stored on a memory chip in each sensing cartridge.
POINT 5
Easy operation with large icon switches on the CV-200 converter.

Specifications

Measuring range Dissolved oxygen concentration:0.00 to 20.00mg/L
O2 Saturation:0.0 to 200.0%
Water temperature:0.0 to 50.0°C
Accuracy(1) ±2%F.S.
Repeatability ±0.5%F.S.
90% Response time at 25°C <30sec
Estimated usable life of the sensing membrane 1 year or more
Operating temperature range Detector:0 to 50°C(2), Converter:-10 to 55°C
Water pressure limits of detector 1MPa
Converter protection class IP66
Cable length 10m (standard)
Weight Detector:2.4kg(including 10m cable), Converter:3.6kg
Transmission outputs DC4 to20mA×2ch (load resistance800Ω)
·Dissolved oxygen concentration/O2 Saturation
·Water temperature
Contact outputs 4 (no-voltage contact output)
·Malfunction:1
·Cleaning control:1
·User-configured:2 selected from the followings:
Lower-/Upper-Alarm and Cartridge replacemente Alarm
Control output 1 (AC power output)
Contact input 1 (no-voltage contact input)
·Remote Cleaning/Hold control.
Power source 90 to 264 VAC,50/60Hz

Note(1):Repeatable accuracy after 24 hours at air-saturated water.
Note(2):There shall be no freezing.

 

Measuring Principle

Measuring Principle

- The sensing membrane emits light by returning to the ground state after the sensing material is excited by the excitation light. The light-emission depends on the oxygen concentration around the sensing membrane.
- The long-term stable measurement can be conducted by use of the reference light which gives standard light-emission.

Light emission lifetime

The lower the oxygen concentration around the sensing membrane, the longer the light emission lifetime, and vice versa. Thus the OD-10 evaluates the light emission lifetime which is correlated to the oxygen concentration.

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