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- Since the electrode consumes oxygen, readings are affected by flow across the sensor tip. Thus enough flow rate at the membrane (or sample renewal rate) must be ensured for accurate results.
Galvanic Electrode
Figure 7: A simplified diagram of a galvanic sensor and circuit. Source: https://www.fondriest.com/pdf/ysi_do_handbook.pdfADD YOUR PART HERE
Measuring dissolved oxygen with either sensor type
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The fact that the sensor measures the pressure instead of the concentration for dissolved oxygen is known to be true because a sample of fresh water can dissolve more oxygen than a sample of sea water at the same temperature and at the same altitude (or under the same barometric pressure). However, the sensor’s output signal is identical in both samples since the oxygen pressure is identical in both media. See the following figure for an example of this concept.
Figure [?]8. DO sensors measure % saturation. Source: https://www.fondriest.com/pdf/ysi_do_handbook.pdf
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