What type of gauge is used to measure microns?

• A. An electronic vacuum gauge
• B. A Bourdon gauge
• C. A Manometer
• D. A Thermal gauge

Answer: (A)

Measuring very low pressures in vacuum systems uses gauges that convert pressure into an electrical signal, allowing readings in tiny units like microns of mercury. An electronic vacuum gauge is designed for this purpose, providing direct readouts in micron-level vacuum pressure by sensing changes in electrical properties as pressure changes (for example, via Pirani or ionization principles).

In contrast, a Bourdon gauge is a mechanical device meant for higher pressure ranges and isn’t sensitive enough for deep vacuum. A manometer relies on a liquid column to indicate pressure difference and isn’t practical for precise, continuous vacuum measurements at micron scales. A thermal gauge can measure low pressures as well, but the electronic vacuum gauge is the standard choice for reading microns and is best suited to vacuum systems.