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Pressure Gauge and Its Useful Applications

5/22/2015 10:12:49 AM | by Chen

Gauges: Pressure

A pressure gauge is an instrument used to measure a condition of a fluid which is either liquid or gas and is specified by the force that it would exert when at rest. It has a unit area of Newton per square centimeter or pounds per square inch. The difference between two pressures (absolute pressure minus atmospheric pressure) is known as gauge pressure. It is the additional pressure in a system used for most practical measurements. This pressure measuring device is commonly used as blood pressure gauge and tire pressure gauge. It is also used in working fluids present in a closed system. The pressure gauge connected to the system indicates the pressure relative to the existing atmospheric pressure. Most calculations involving pressure such as ideal gas law requires gauge pressures to be converted to absolute pressures.

Bourdon-tube gauge is the most widely used instrument in measuring pressure for all kinds of liquids and gases. This includes water, steam, and air up to 100,000 pounds per square inch of pressure. It has high grade of measuring technology with simple, rugged yet flexible operation making it advantageous and cost effective to wide range of industries. This kind of pressure gauge is mostly applied in highly automated chemical processes such as petrochemical processing, hydraulic and pneumatic installations and other refineries where critical process monitoring is necessary.

Types of Pressure Gauges

• Low Pressure Gauge – This kind of pressure gauge is applicable in corrosive environments like plant construction, chemical and petrochemical, clean rooms, and pneumatic systems. It is designed for media that will not obstruct the pressure system.
• Commercial Pressure Gauge – This type of pressure gauge is usually found in HVAC refrigeration, food and beverage, ventilation and other general purpose applications.
• Industrial Pressure Gauge – It is designed for media that will not obstruct the pressure system. It is made of stainless steel used in alternative fuels, oil and gas, chemical and petrochemical manufacturing.
• Differential Pressure Gauge – It is used to measure two applied pressures; static process pressure and the high and low pressure. It is ideal to use in HVAC, refrigeration, and air handling industries.
• Process Pressure Gauge – A type of pressure gauge used to protect against harsh conditions such as pressure spikes, vibration, and pulsation coming from petrochemical industries and manufacturers.
• Seal Gauge – It is designed to eliminate probable leak paths. This pressure gauge is combined to a diaphragm seal isolator wherein it is used in sanitary and pharmaceutical process industries.
• High Precision Test Gauge – It is an accurate test gauge widely used in corrosive and industrial applications. It is designed to calibrate and test laboratories as well as the pressure monitoring panels.
• Absolute Pressure Gauges – The absolute pressure gauge used to monitor the vapor pressure and condensation pressure of liquids. It measures the absolute pressure without the effect of barometric pressure.
• Air Pressure Gauge – It is commonly used on tires to ensure the correct amount of air for optimum performance.
• Oil Pressure Gauge – This type of pressure gauge monitors the safe and unsafe level of oils that is used in machine engines and lubricates moving parts while in motion. It protects the motor components from damaging caused by the natural friction.

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