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Dissolved oxygen is the amount of free oxygen in water or any other liquid. Sensors on the other hand are devices/equipment used to measure the amount of the dissolved oxygen in an aqueous solution. Sensors allow automatic detection. There are different types of sensors varying on how they detect and some of them include, optical, galvanic, electrochemical and polagraphic sensors. All these sensors defer in their uses like for instance, optical sensors do not require stirring  of the solution in order to get the measurements while electrochemical sensors require stirring. Due to this variation in uses, a person may choose the one that serves him best.

Taking an example of two polagraphic sensors which include YSI PRO 20 and YSI 55.These two differ in their uses and calibration. For instance the YSI PRO 55 has an inbuilt barometer thus making it quick and accurate unlike YSI 55 which doesn't have inner barometer.
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Optical and electrochemical sensors are the best one that helps to identify dissolved oxygen. each type of sensor uses a different type of solution to measure dissolved oxygen. Based on your requirement you can choose the best one.
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Dissolved oxygen sensors typically measure the level of dissolved oxygen in water via an electrochemical or optical method. Electrochemical sensors measure the electrical current produced by the oxygen reaction on the electrodes, while optical sensors measure the amount of light absorbance in the water sample.
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Optical dissolved oxygen (DO) sensors are the most commonly used sensors for measuring dissolved oxygen in water. These sensors use fluorescence technology to measure the amount of oxygen present in a sample. Other sensors such as polarographic, galvanic and thermistor sensors can also be used, but optical DO sensors are the most reliable and accurate.
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The most commonly used sensors to identify dissolved oxygen are polarographic sensors and optical sensors, such as fluorescence-based sensors.
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Oxygen sensors, such as optical, electrochemical, and galvanic sensors, are commonly used to measure dissolved oxygen in water.
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Optical DO sensors, popularly known as luminescent DO sensors  but some are called fluorescent sensors, measure dissolved oxygen concentration in water based on the quenching of luminescence in the presence of oxygen. They can measure either the intensity or the lifetime of the luminescence as oxygen affects both.
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