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What does a dissolved oxygen probe measure?

Answer and explanation

Correct answer: Amount of oxygen dissolved in the medium

The direct answer is A: the amount of oxygen dissolved in the medium. A dissolved oxygen, or DO, probe detects oxygen available in the liquid phase of a bioreactor, usually as a concentration or percentage of air saturation. This is important because aerobic cells need oxygen for respiration and growth. The probe sends a signal to the control system, which may adjust stirring or air supply when oxygen becomes too low. Option A is correct because it states exactly what the probe measures. Option B is wrong: fermenter height is measured by physical dimensions or a level instrument, not a DO probe. Option C is wrong: the product name is recorded as information and cannot be measured by this sensor. Option D is wrong: sound is measured by an acoustic instrument, not by an oxygen probe. A helpful exam cue is to connect DO with aerobic culture, aeration, and agitation; it is not a measurement of vessel size or product identity.

Related tags

Dissolved Oxygen ProbeOxygenMonitoring

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