Question 197Refrigeration & AC - Assistant Engineer

The correct answer is B. The gauge depicted in illustration GS-RA-37 that 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, is option B. This type of gauge is commonly used in the marine industry, including for Coast Guard-regulated systems, to verify that a sufficient vacuum has been achieved during the evacuation process to remove moisture and contaminants prior to charging a system. The incremental display, rather than a continuous readout, is a common feature of these specialized vacuum gauges. The other options, A, C, and D, do not match the specific capabilities and display characteristics described in the question.