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.
- Light emission lifetime evaluation system to ensure long-term stable measurement without being affected by temporal change of the light source.
- No incident flow is required because the OD-10 optical system does not consume oxygen during measurement.
- Easy maintenance with no use of electrolyte solution.
- 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.
- 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
- 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.
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.
