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Which of the following sensor penetrates into the fermenter?

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in Fermentation Technology by (72.1k points)
Which of the following sensor penetrates into the fermenter?

(a) Exhaust-gas analyzers

(b) pH electrodes

(c) Tachometers

(d) Load cells

I had been asked this question in examination.

This is a very interesting question from Instrumentation and Control topic in portion Instrumentation and Control of Fermentation Technology

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Right answer is (b) pH electrodes

Easiest explanation: The sensors which penetrate into the fermenter are pH electrodes, dissolved-oxygen electrodes, etc. Exhaust gas analyzers work on samples which are continuously withdrawn from the fermenter. Tachometers and Load cells are sensors which do not come in contact with fermentation broth or gases.

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