How does a differential-pressure transmitter measure level?

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Prepare for the NRCC Instrumentation Test. Study with flashcards and multiple-choice questions, each complemented with hints and explanations. Gear up for your exam success!

Multiple Choice

How does a differential-pressure transmitter measure level?

Explanation:
Differential-pressure level measurement hinges on hydrostatic pressure created by the liquid column. The pressure at depth is p = ρ g h, so the difference in pressure between a tap at the bottom and a tap higher up (or at the top) is proportional to the liquid height. The transmitter senses that pressure difference directly and uses it to infer level (with density known or assumed to convert the differential pressure to height). It does not measure the liquid’s color, flow through an orifice, or the average density itself.

Differential-pressure level measurement hinges on hydrostatic pressure created by the liquid column. The pressure at depth is p = ρ g h, so the difference in pressure between a tap at the bottom and a tap higher up (or at the top) is proportional to the liquid height. The transmitter senses that pressure difference directly and uses it to infer level (with density known or assumed to convert the differential pressure to height). It does not measure the liquid’s color, flow through an orifice, or the average density itself.

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