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The part of the automated system that shown in the figure is ____________

(a) Dialyzer

(b) Pump

(c) Recorder

(d) Sampler

This question was addressed to me during an online interview.

This intriguing question comes from Skin Reflectance Oximeters in chapter Oximeters of Biomedical Instrumentation

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Right choice is (d) Sampler

Easiest explanation: The automated system consists of a group of modular instruments interconnected together by a manifold system and electrical systems. The sample to be analyzed is introduced into a stream of diluting liquid flowing in the narrow bore of a flexible plastic tube. The stages of the analytical reaction are completed by the successive combination of other flowing streams of liquids with the sample stream, by means of suitably shaped glass functions.

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