Selecting a Pressure Gauge on Amazon.com
A pressure gauge measures the pressure level inside a container that holds gas, liquid, vapor, or solid material, helping ensure optimal performance and safety, or precise measurement. Pressure gauges range from the simplest bike tire gauge to complex gauges for accuracy in industrial and mechanical processing.
Pressure gauges generally come with either a male or a female mount that can be situated on the back, top, or base of the dial. The dial varies in range and increment depending on the application to which it is suited. The diameter of the dial varies in size, and the case may be made of steel, aluminum, nylon, or plastic. The gauge may be filled with liquid such as glycerin oil to dampen the effect of vibration and lubricate the gauge movement. A digital pressure gauge has an LCD screen to display measurements and can measure positive, negative, or differential pressure. It may have features such as selectable measurement units, data hold, minimum and maximum measurements, and data storage.
The three standard measurement techniques are gauge pressure, absolute pressure, and differential pressure. Gauge pressure is a measurement of pressure relative to ambient atmospheric pressure, while absolute pressure uses atmospheric pressure as its zero reference. Both a tire pressure gauge and blood pressure cuff measure gauge pressure. A water pressure gauge measures the gauge pressure in a residential, commercial, or industrial water system. A hydraulic pressure gauge monitors the gauge pressure in hydraulic lines, such as those found in industrial machinery and construction or agricultural equipment. Absolute pressure is measured in instruments such as barometers or in applications where condensation pressure or vapor pressure must be monitored.
A vacuum pressure gauge measures pressure below atmospheric pressure, and is used to monitor vacuum pressure in scientific applications such as vacuum systems or aspirators, in industrial applications such as petrochemical processing, and in automotive repair to test electronic fuel pumps and diagnose problems in a vehicle's fuel system.
A differential pressure gauge measures the difference in pressure between two different points, and is often used in industrial processes. Manufacturers of pressure gauges include Ashcroft.