Oxygen Optode 4831/4831F is a compact fully integrated sensor for measuring the O2 concentration. Fast Response Foil (4831F, refer overleaf) Advantages: • Optical measurement principle • Lifetime-based luminescence quenching principle • Long time stability • More than one year without recalibration • Low maintenance needs • Small size and weight • Stand-alone sensor • Output format: RS232, 0-5V • Three depth ranges maximum 6000 meter Since oxygen is involved in most of the biological and chemical processes in aquatic environments, it is one of the most important parameters to be measured. Oxygen can also be used as a tracer in oceanographic studies. For environmental reasons it is critical to monitor oxygen in areas where the supply of oxygen is limited compared to demand e.g. • In shallow coastal areas with significant algae blooms • In fjords or other areas with limited exchange of water • Around fish farms • Areas of interest for dumping of mine or dredging waste The Aanderaa oxygen optodes are based on the ability of selected substances to act as dynamic fluorescence quenchers. The fluorescent indicator is a special platinum porphyrin complex embedded in a gas permeable foil that is exposed to the surrounding water. For the standard version 4831 a black optical isolation coating protects the complex from sunlight and fluorescent particles in the water. This sensing foil is mounted on a sapphire window providing optical sampling from inside a watertight housing. The lifetime-based luminescence quenching principle offers the following advantages over electro-chemical sensors: • Not stirring sensitive (it consumes no oxygen) • Less affected by fouling • Measures absolute oxygen concentration without repeated calibrations • Better long-term stability • Less affected by pressure • Pressure behaviour is predictable • Faster response time The oxygen optode outputs data in RS-232 and analog 0-5V. The sensor can present the O2 concentration in µM, Air Saturation in % and Temperature in °C.

Securing plate Sapphire window Thermistor LED Analog board Digital board Interface board 111.5mm PIN CONFIGURATION SUBCONN MCBH8 V+ Gnd Analog SGnd 1 Oxygen: O2 Concentration Air Saturation 1) Measurement Range: 0 – 500 µM 0 - 150% Resolution: <1 µM 0.4 % 2) 3) Accuracy: <8 µM or 5% <5 % whichever is greater Response Time (63%): 4831F (with fast response foil) <8 sec 4831 (with standard foil) <25 sec Temperature: Range: -5 to +40°C (23 - 104˚F) Resolution: 0.01°C (0.018°F) 4) Accuracy: ±0.03°C (0.18°F) Response Time (63%): <2 sec Output format: RS-232, 0-5V Output Parameters: RS-232: O2 Concentration...