Shallow Water Micro-sensor for Dissolved Oxygen
For very fast vertical and horizontal profiling

The galvanic dissolved oxygen micro-sensor for shallow water has been developed above all for the very fast in-situ depth profiling with CTD probes and for horizontal profiling with towed unduclating vehicles, ROVs or AUVs in rivers, lakes and oceans. Because of the partial pressure of the gaseous O2 , the analyte permeates through the membrane. Inside of the sensor the oxygen reacts electrochemically at the working electrode. This causes a current corresponding to the partial pressure of the dissolved oxygen. 

The sensor has a very short response time of down to some hundred milliseconds for t90% . Streaming, as it is well-known from all the other Clark-type membrane covered oxygen sensors, is not necessary. Therefore profiling with very high local resolution is possible. Both turbid, muddy and coloured solutions do not affect the sensor signal. 

For measuring the oxygen saturation, the sensor has to be combined with a temperature measurement. If the oxygen concentration has to be determined, the additional measurement or knowledge of the conductivity/salinity is required. The maximum deployment depth is 100 m. All sensors are delivered with temperature compensation data.

Technical data of the Dissolved Oxygen micro-sensor: