Conductivity sensors from Aanderaa are compact, fully integrated sensors for measuring the electrical conductivity of seawater. Conductivity is a key parameter for in-situ measurements of several fundamental physical properties of seawater. For seawater, the ability to conduct electrical current is mostly dependent on temperature and the amount of inorganic dissolved solids. Salinity is defined as the concentration of dissolved solids. This means that, together with temperature and depth information, a good estimate of the salinity may be determined. By using the inductive principle, stable measurement can be obtained with­out utilizing electrodes that are easily fouled and may wear out in the field.

The Aanderaa Current Sensors are based on the backscatter acoustic Doppler principle. Doppler Current Sensor (DCS) The Aanderaa Doppler Current Sensor is a rugged, true vector averaging sensor for measuring current speed and direction in the sea. The sensor has built-in compass and tilt sensor and may also output sea temperature. The speed range is 0 to 300 cm/s. Low current drain and flexible sampling schemes. New multi-frequency Doppler Current Sensor (DCS) with ZPulse technology achieves better performance using only half the power than previous models. The new, fast response compass and tilt circuitry has no moving parts achieving excellent performance in unstable areas such as in the wave zone close to surface. In-line ZPulse DCS Doppler Current Sensor 5800 / 5810 The inline ZPulse DCS has been designed in order to easily integrate into systems offering a compact and elegant solution. It is based on a modified version of the ZPulse Doppler Current Sensor 4520. The unit connects to a combined mooring and signal cable in one end and allow for connection of a continuation cable at the opposite end. It can hold a load of up to 1300 kg. It has been developed to replace the previous Aanderaa DCS 4100 using newer technology and extending capabilities. DCPS 5400/5400R/5402/5402R/5403/5403R - Doppler Current Profiler Sensor The Doppler Current Profiler Sensor (DCPS) is a medium range, 600kHz current profiler smart sensor. If features innovative development of the acoustic profiling ability to collect high quality current information also on moving and tilting platforms. The 5400/5400R version is 300m depth rated, the 5402/5402R version is 4500m depth rated and the 5403/5403R version is 6000m depth rated and is intended for commercial as well as research use. It comes with an integrated temperature sensor that can be calibrated on request.

The AADI 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. The lifetime-based luminescence quenching principle offers the following benefits: 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

Aanderaa pressure sensors are compact, intelligent pressure sensors designed for use on Aanderaa Data Instruments dataloggers as well as in other measuring systems. The sensors are based on a silicon piezoresistive bridge sampled and temperature compensated by an advanced Digital Signal Processor. Since all calibration and temperature compensation data is stored internally,pressure can be presented directly in engineering units without any external calculation. The range on both SR10 outputs is user configurable, i.e. confine the range to get optimal resolution. The sensor is also available in a vented version. This means that the sensor is automatically compensated for air pressure. This is done by use of a compensating unit placed in air and an air-pipe in the cable between the sensor and compensating unit.

Aanderaa temperature sensors are compact, intelligent temperature sensors designed for use on Aanderaa Data Instruments Dataloggers and as stand-alone units. A compact fully integrated sensor for measuring the water temperature. The sensor is designed to be mounted on Aanderaa Recording Instruments and Dataloggers. The sensor can also be used as stand alone, and is easily integrated in other measurement systems with third party dataloggers.

The Aanderaa Tide sensors are compact fully integrated sensor for measuring the tide conditions. Tide Sensors 5217/5217R are compact fully integrated sensors for measuring the tide conditions. The sensor is designed to be mounted on the Aanderaa multiparameter SeaGuard® Platform or via cable connected to SmartGuard datalogger. The standard version has AiCaP CANbus and RS-232 output. R-version has RS-422 output for longer cable length. The sensor is also available in a vented version. This means that the sensor is automatically compensated for air pressure. This is done by use of a compensating unit placed in air and an air-pipe in the cable between the sensor and compensating unit. The sensor application areas are in fixed installations, either deployed in a seabed installation in shallow waters, or mounted onto a fixed structure in the upper water column. Typical applications for the sensor are measurements of tide in ports and harbors, marine operations, weather forecast, and climate studies.

The Aanderaa Turbidity sensors detects infra-red light scattered by particles suspended in water. This measurement is known to have a good correlation to the amount of suspended matter in water and can be used to monitor e.g. sediment, algae or particle pollution. The sensor generates an output voltage proportional to the turbidity or suspended solids. The low power consumption makes it ideal for applications where battery drain is a concern.

Aanderaa Wave and Tide Sensors are compact fully integrated sensor for measuring the wave and tide conditions designed to be mounted on the Aanderaa multiparameter SeaGuard Platform or via cable connected to SmartGuard datalogger. Wave & Tide Sensor 5218/5218R are compact fully integrated sensors for measuring the wave and/or tide conditions. The sensor is designed to be mounted on the Aanderaa SEAGUARD® Platform or via cable connected to SmartGuard Datalogger. The sensor may also be used as stand alone with RS-232 output. The 5218R sensor is designed for use with long cables by means of an RS- 422 full duplex interface. The R-version can not be used in SeaGuard applications. The sensor is also available in a vented version. This means that the sensor is automatically compensated for air pressure. This is done by use of a compensating unit placed in air and an air-pipe in the cable between the sensor and compensating unit. The sensor application areas are in fixed installations, either deployed in a seabed installation in shallow waters, or mounted onto a fixed structure in the upper water column. Typical applications for the sensor are measurements of tide and wave in ports and harbors, marine operations, weather forecast, and climate studies.