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What is Pressure Measurement?

Pyrosales Pressure Gauge 1 ImagePressure measurement is the analysis of an applied force by a fluid, liquid, or gas on a surface. Pressure is normally measured in units of force per unit of surface area. Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure and display pressure in an integral unit are called pressure meters or pressure gauges or vacuum gauges. The most widely known used gauges is the Bourdon gauges which is a mechanical device, which both measures and indicates.

Pressure measurement tools are not too dissimilar to the first measurement devices from the mid-19th century. Typically constructed with a curve tube, an input for pressure connected to an indicator needle. Over time, technology improvements have provided additional options for specific application, including stainless steel construction for corrosive environments, diaphragm seals to prolong the operating life of the gauge.

Accurate pressure measurement is critical in any process. It can be life or death in extreme cases. Pressure is the second most common measurement in process control, after temperature. Measurement equipment should be regularly calibrated and provide accurate data to ensure the process runs safely and smoothly.

Pressure is everywhere, yet not visible to the naked eye. It is best defined as a force that is applied uniformly over a surface. Pressure is measured in units of force per unit of area. There are three kinds of pressure, gauge, absolute and fluid.

  • Fluid pressure measures the force per unit of a gas or liquid
  • Absolute pressure is the pressure compared with the zero pressure of empty space (vacuum)
  • Gauge pressure refers to pressure compared with atmospheric pressure (surrounding air pressure)

Pyrosales provides a wide variety of gauges as shown below:

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Absolute Pressure Gauge: Atmospheric pressure varies depending on location altitude and weather conditions. In such variable conditions, precise pressure measurement can only be achieved if a fixed (UN-changed) reference point is established.


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Bourdon Pressure Gauge: Pressure gauge designed to withstand measurement in an aggressive environment. Suitable for process industries such as Petro-chemical, energy, gas, food processing and nuclear. Available in dry case or liquid filled.


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Bourdon Sensing Pressure Gauges 40/50/63mm: Designed to fulfill most industrial requirements as well as commercial, available in 40mm, 50mm, 63mm. Developed for OEM applications in compressed gases, lubricating circuits etc.

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Capsule Sensing Pressure Gauge: Low range with high accuracy, all stainless-steel internals, compact design, suitable for low pressure measurement. Sensing element capsule consists of 2 stainless steel laser welded diaphragms.

Pyrosales Pressure Gauge 6 ImageDiaphragm Seals: A diaphragm seal is a devise where a flexible membrane seals and isolates the measuring instruments from the process medium. The instrument side of the diaphragm is filled with appropriate fluid. The pressure exerted by the process fluid on the diaphragm is hydraulically transmitted through the seal fluid to the pressure sensing element. The seal protects the pressure sensor from the harmful and hazardous effect of the process fluid.

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Diaphragm Sensing pressure gauge: Typically used for the low pressure, available in dry case or liquid filled, all stainless-steel internals.


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Differential Pressure Gauges: Differential pressure gauges are used for measuring differential pressure across filters, strainers, columns, reactors, ID/FD fans, blowers and for flow measurement. A set of 2 stainless-steel bellows or 2 diaphragms enables direct reading of the actual differential pressure. Each port can withstand the full static pressure without any damage.

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Hygiene Gauge: Hygiene gauges are designed for pressure measurement in sanitary applications such as pharmaceutical, dairy, biotechnology, food, and beverage.

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Indicating Low Range Pressure Gauge: Suitable for low pressure application, combination of indication and switch, single or double contacts available. Set the switch externally – throughout the range.

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Indicating pressure Switch: Suitable for low pressure application, combination of indication and switch, single or double contacts available. Set the switch externally – throughout the range.

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Mud Gauges: Designed for oil and cool industries to measure the pressure of pulsating fluids, including solid particles in suspension of standpipe of mud pumps. Can be used for any fluid. Sturdy construction can undergo sever working conditions. The pressure ranges meet every requirement of the oil industry.



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Master Pressure Gauges: Accuracy class , rugged construction, 1.2-fold over range capability for short duration. Supplied with carry case.


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Pressure Accessories: A variety of pressure accessories are available including, snubber, pig tail syphon, U syphon, gauge saver, gauge adapter, swiveling adapter or gauge union.

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Pressure Gauge with External Zero Adjustment: Pressure gauges and differential pressure gauges typically have a micrometre type pointer, where zero can only be adjusted after opening the bezel and glass, which is not practical for liquid filled gauges. A gauge with external zero adjustment using external knob, avoids having to drain and replace any liquid. Available in pressure gauge and differential pressure gauge.

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Receiver Gauges: Suitable for receiving pneumatic signals of level and flow transmitters.


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Skin Type – Gas Filled Dial Thermometer: Skin type temperature gauges – used for measurement of surface temperature of process lines.


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Safety Pattern Solid Front Pressure Gauges: All stainless-steel construction, suitable for process industries including chemical, Petro-chemical, energy, gas, food processing, and nuclear etc. Solid baffle wall and blow out back which immediately releases in the event of accidental tube rupture.

Pyrosales has extensive knowledge and experience in temperature management and process control. We provide advice, design, repair, and fabrication to our clients on a wide range of industries, uses, and capabilities of temperature management.