In instrumentation, a dry leg is used to protect an instrument from which problem?

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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

In instrumentation, a dry leg is used to protect an instrument from which problem?

Explanation:
Preventing moisture reaching the sensing element is the key idea. A dry leg is a short, liquid-free section of the sampling line that’s kept dry (often purged with dry gas) so any condensate in the process stream drops out in the leg rather than entering the instrument. This keeps the sensor and electronics from moisture-related measurement errors and damage. It isn’t about shielding from mechanical shock or overpressure, and while moisture can contribute to corrosion, the dry leg’s purpose is specifically to stop condensate from reaching the instrument.

Preventing moisture reaching the sensing element is the key idea. A dry leg is a short, liquid-free section of the sampling line that’s kept dry (often purged with dry gas) so any condensate in the process stream drops out in the leg rather than entering the instrument. This keeps the sensor and electronics from moisture-related measurement errors and damage. It isn’t about shielding from mechanical shock or overpressure, and while moisture can contribute to corrosion, the dry leg’s purpose is specifically to stop condensate from reaching the instrument.

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