The core of every oxygen sensor is the measuring cell. Different versions are available based on different technical principles; there is not that one best solution. Every technology has some main characteristics, advantages and disadvantages. The question is: what does the application require regarding accuracy, speed or lifetime.
Electrochemical measuring cells are standard in many applications. They are comparatively low-priced and require no power supply. They are not influenced by burnable gases. Weaknesses are the relatively short durability when having high oxygen concentrations as well as the slow response and respectively, the long measuring time.
For some sensors there might be a cross-sensitivity with carbon dioxide (CO2). This cross-sensitivity can be compensated by means of software algorithms, but requires some technological know-how. In addition, electrochemical measuring cells require frequent calibrations causing some more effort.
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