A Compact Fully Integrated Sensor for Measuring O2 concentration
The Aanderaa Oxygen optode was the first and only to measure dissolved oxygen for years without drift - now it is one of the fastest!
The Oxygen optode is designed to measure absolute oxygen concentration and % saturation. The optode can be used from streams to deep sea, from fish farms to waste water and from polar ice areas to hydrothermal vents.
- Response time <8 sec (63%)
- High accuracy
- Not stirring sensitive (it consumes no oxygen)
- Lower fouling sensitivity
- Measures absolute oxygen concentrations without repeated calibrations
- Better long-term stability
- Hot water monitoring
- Less affected by pressure
- Not sensitive to H2S
- Not freezing sensitive
Since oxygen is involved in most of the biological and chemical processes in aquatic environments, it is a crucial parameter to measure. Oxygen can also be used as a tracer in oceanographic studies. Aanderaa revolutionized oceanographic oxygen monitoring/research with the introduction of Oxygen Optodes in 2002. Applications range from shallow creeks to the deepest trenches, from tropical to in-ice/in-sediment measurements. More than 150 scientific papers have so far been published using these optodes.
These sensors are based on the ability of selected substances to act as dynamic fluorescence quenchers. The fluorescent indicator is a special platinumporphyrin complex embedded in a gas permeable foil that is exposed to the surrounding water. This sensing foil is attached to a glass window providing optical access to the measuring system from inside a watertight housing. The sensing foil is excited by modulated blue light; the sensor measures the phase of the returned red light. For improved stability the sensor also performs a reference phase reading by use of a red LED that do not produce fluorescence in the foil. The sensor has an incorporated temperature thermistor which enables linearization and temperature compensation of the phase measurements to provide the absolute O2-concentration.
Selection Guide
| 4835 | 4831/4831F | 4330/4330F | 4531 | |
| Shallow water (300m) | X | X | X | X |
| Intermediate Water (3000m and 6000m) |
X | X | ||
| Deep Water | X | X | ||
| Used with Seaguard | X | X* | ||
| Analog output, 0-5V | X | X | ||
| Analog output, 4-20mA | X | |||
| Real-time RS-232 output** | X | X | X | X |
| Electrical connection: 10-pin Lemo | X | X | X | |
| Electrical connection: 8-pin Subconn | X |
*Only use 4330F if fast response oxygen, and/or fast response temperature is needed. The standard sensing foil is protected by an optical isolation layer which makes the foil extra rugged and insensitive to direct sunlight. The fast response sensing foil is not equipped with this layer; ambient light intensity higher than 15000 lux may cause erroneous readings. To avoid potential bleaching the fast response foil shouldbe protected from ambient light when storing the sensor. We recommend the standard foil in applications where fast response time is not needed.
**Please note: All sensors use RS-232 for configuration.
