What are Pressure Gauges?

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A pressure gauge is an instrument designed to measure the pressure of a gas or liquid. These devices are especially important for systems with dynamic working characteristics that require constant monitoring. Standard gauges typically utilize a bourdon tube-sensing element for measuring pressures 15 psi or more. This element is usually stainless steel or copper alloy. The bourdon tube is spirally wound or c-shaped and when a pressure change occurs, it flexes and produces a rotational movement that moves the gauge indicator. Pressure gauges have a wide variety of applications. The most common commercial use is that of a tire pressure gauge. There are various industrial applications for pressure gauges. They provide a visual display of pressure to monitor air and gas pressure for vacuum equipment, compressors. Specialty tanks also use pressure gauges like fire extinguishers and medical gas cylinders. There are instances of pressure gauges that do not display a measure of pressure. Instead, they monitor pressure and send an electronic output signal for any required changes in the system.

The accurate selection of a pressure gauge requires the consideration of some key factors. These include the gauge process, range, environment, accuracy, dial size, connection and mounting needs. It is critical to choose a gauge with a pressure range that adapts to all expected pressure swings, and inhibits excessive needle movement. It is also a good idea to limit the normal working pressure to twenty five to seventy five percent of the scale of the gauge.