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
• Difference between analog manifold gauges (usually inches of mercury or psig) and micron gauges used for system evacuation • How a digital numeric micron gauge displays vacuum versus a threshold/step-type indicator that lights up ranges or blocks of microns • Purpose of measuring to the micron level when confirming dehydration after pulling a vacuum on a refrigeration/HVAC system
• From the four illustrations, which ones are clearly standard pressure/vacuum manifold sets rather than true micron gauges? • Among the remaining instruments, which one shows a continuous numeric readout of microns, and which one instead uses a bar/step or lighted scale to show when certain micron levels have been reached? • Which design best matches the phrase "incremental threshold intervals rather than continuously" in the question stem?
• Verify which gauge face or display actually uses the word "micron(s)" or a very fine vacuum scale suitable for deep vacuums • Confirm that the chosen instrument is clearly intended for evacuation/dehydration testing, not just charging/operating pressure readings • Make sure the display style matches the description: step / level / bar-graph indicators instead of a smoothly moving needle or changing numeric value
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