Engine Refrigeration (Supplementary) USCG Question #347 (Set 6)

Which of the illustrated gauges is capable of measuring vacuums at the micron level for the purpose of proving system dehydration during system evacuation with a vacuum pump, but displays the achieved vacuums at incremental threshold intervals rather than continuously. Illustration GS-RA-37

USCG Exam Illustration GS-RA-37
USCG Examination Diagram: Illustration GS-RA-37
Official USCG Answer & Rule Citation

Correct Answer: Option B — B

Electronic thermistor or thermocouple micron vacuum gauges measure absolute pressure down to the micron level for verifying system dryness during deep evacuation, utilizing specific threshold indicators to display moisture removal progress.

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