Which type of gauge is used to measure a vacuum of 500 microns?

The correct answer is the electronic vacuum gauge. This type of gauge is specifically designed to measure very low pressures, often down to single-digit microns, making it suitable for vacuum applications in systems where ultra-high vacuum needs to be assessed. At 500 microns, the vacuum is considered high vacuum, which requires precise measurement for various processes, such as when evacuating air conditioning systems or performing advanced laboratory experiments.

Electronic vacuum gauges use sensors that can detect minute pressure changes and convert these readings into electrical signals that are easily interpreted. Their accuracy and sensitivity make them ideal for applications where reliable vacuum measurement is crucial.

Mechanical vacuum gauges and liquid column manometers are typically not suitable for measuring such low vacuum levels. Mechanical gauges can become less accurate at lower pressures, and liquid column manometers are limited by the physical properties of the fluid used, which may not accurately measure in the low micron range. Bourdon gauges are primarily used for measuring higher pressures and would not perform adequately in the sub-atmospheric range. Thus, for accurate measurements at 500 microns, an electronic vacuum gauge is the preferred choice.