Vacuum gauge
There are many types of pressure gauges measurement ranges available to measure the gauge pressure. The range would typically include positive pressure, vacuum measurement, compound measurement, differential pressure, absolute pressure, and sealed pressure. A positive pressure gauge measures a pressure range from zero pressure to a higher, positive pressure. Vacuum measurement switches measure vacuum pressure (negative pressure). A compound pressure gauge measures a pressure range from negative pressure (vacuum) to positive pressure. Differential pressure gauges give the relative pressure between two points.
Different document define vacuum gauge in various manner. Let’s discuss some of the definition here, which can be easily found at various other websites.
1.
A differential pressure gauge to indicate the level of vacuum in the system. This can vary between 38kPa for a direct-to-line parlour to 50kPa for a recorder milking machine.
A differential pressure gauge to indicate the level of vacuum in the system. This can vary between 38kPa for a direct-to-line parlour to 50kPa for a recorder milking machine.2.A piece of equipment used to measure the vacuum present in a container.
A piece of equipment used to measure the vacuum present in a container.3.A gauge for indicating negative atmospheric pressure
A gauge for indicating negative atmospheric pressureAnother view is that a vacuum gauge is used to measure the pressure in a vacuum. This vacuum can be further divided into two categories, such as high and low vacuum, though less but at times you would come across ultra-high vacuum. Many of the different techniques used to measure these categories have an overlap at some point in the pressure range. If you are able to combining a number of different kinds of gauge, then possibly you would be able to measure system pressure from 10mbar down to 10e-11mbar.
There are various vacuum gauges available to measure Vacuum pressure such as Dial Gauge, Glycerine Filled Gauge, Barometrically Compensated Vacuum Gauges, Baratron Gauges, Pirani Gauge, Penning and Ionisation Gauges, and Mercury/Tube Gauges. Among the first ways to investigate vacuum, was a vacuum gauge made of a glass tube and a bowl of mercury was used. The vacuum was measured as the height to which the mercury could be lifted up the tube. They are prone to contamination and false readings unless special care is taken. However, note that a vessel or container under vacuum will have a difference in pressure across its surface.
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