A type of maintenance that would be performed on a vacuum pressure gauge would be to check for ____

• A. Leaks
• B. Calibration
• C. Sticking
• D. Scale drift

Answer: (C)

Gauge movement and reliability hinge on keeping the mechanism from sticking. A vacuum pressure gauge uses a moving element and a pointer, and if that mechanism sticks due to residue, corrosion, or wear, the reading will not reflect the actual pressure. Maintenance would focus on inspecting and freeing the moving parts—cleaning, lubricating, or replacing worn components—so the indicator can respond smoothly and accurately. Leaks are important to check in the vacuum system, but that concerns the piping and connections rather than the gauge’s internal movement. Calibration fixes accuracy of the scale but doesn’t address a physically stuck needle. Scale drift refers to changes in the gauge’s indicated value over time and is something calibration or replacement would handle, not a one-off sticking issue.