# Pressure Gauges

Pressure Gauge is an instrument for measuring and display the condition of a fluid (liquid or gas) that is specified of the exertion of fluid in an integral unit. The reading on a gauge is the difference between two pressures is known as the gauge pressure. The lower of the pressures is the pressure of the atmosphere, while the total pressure represents the sum of the gauge and atmospheric pressures.

GAOTek pressure gauges are reliable, high quality, and affordable instruments that can be used to detect the atmospheric pressures precisely and provide an accurate measurement reading of the atmospheric pressure. GAOTek pressure gauges are ideal for measuring or displaying the atmospheric conditions and offers a variety of features such as selectable units of measurement, differential measurement, max/min/average reading function, data record or hold function, LCD backlight, zeroing, offset, data compensation, battery alarm, auto power off setup function, and over-range indicator.

Technologies

The pressure gauge is an instrument used to measure the condition of the atmospheric pressure in which the force of the fluid would exert is measured and displayed in the gauge pressure. The gauge pressure simplifies the process by finding and display the difference between two pressures as the lower pressure is the atmospheric pressure while the total or absolute pressure represents the sum of the gauge and atmospheric pressures.

The simplest device for measuring static pressure up to about 90 pounds per square inch is a U-tube manometer, in which one column of a liquid in the tube is open to a region of high pressure and the other column to a region of low pressure. The differential pressure is presented by the difference in level between the two columns of the liquid, then it is calculated as the difference in level multiplied by the density of the liquid. The manometer is commonly used when measuring mercury, oil, alcohol, and water.

l  Pressure gauges are simple devices although there are many considerations when selecting the best instrument for certain applications. Some gauges are digital while other are operated in analog.

l  Analog pressure gauges – is often referred as mechanical gauges, it uses a needle that points to a number on a scale that corresponds to the pressure sensed by the measuring element.  It is more found commonly as it offers an accurate, inexpensive option that does not require a power source and has small maintenance. Analog gauges rely on Bourdon tube and Bellows.

l  Bourdon Tube is the most common type of analog gauges; it relies on the principle that a curved tube tends to straighten when it is subjected to pressure. Although Bourdon Tube suffers to the limitations of lack of sensitivity when obtaining an accurate reading at low pressure and are sensitive to shocks or vibration.

l  Bellows gauges are used when measuring pressuring ranges below the ideal ranges of the Bourdon tubes. It contains an elastic element that radially expands and contracts to respond when pressure changes. Bellow gauges excel more in a low-pressure application and provide an accurate and sensitivity for a more precise measure.

l  Digital gauges used advanced sensors and microprocessors to display a highly accurate pressure reading on a digital indicator. It is more expensive than analog gauges although it provides a number of features that offers alternatives for a number of applications. Digital gauges provide more reliability than analog as it has fewer parts than analog and it is simpler to operate while providing a versatility of programmable to a computer.

Strain gauge relies on piezoresistive effect which describes the changes in the electrical resistivity of a semiconductive metal.

Features

GAOTek pressure gauges are reliable, accurate, and easy to use to help prevent failure in everyday operations. It offers selectable features such as:

l  Selectable units of measurement

l  Differential pressure measurement:  for easy indication of the difference of pressure

l  LCD backlight

l  Other Functions: max/ min/ average reading record, zeroing, offset, data compensation, low battery alarm, auto power off setup function, over-range indicator,

Applications

Pressure gauges is a common component in various industries. Although Bourdon tubes are mostly used for most applications, pressure gauges are crucial components of most processing systems. It is also used in applications such as refineries, chemical processing, critical process monitoring or any monitoring that affects an atmospheric change.

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