The Pressure Gauges

The pressure gauges are devices used for measuring the pressure or a vessel or a container. These pressure vessels contain compressed liquid or gas.  The pressure gauges are widely used in different fields such as in automotive and power generation,  where they are used for regulating the pressure of different systems. These devices are designed in various styles. The pressure gauges are calibrated periodically to confirm that they are working properly. Regulation of pressure is very critical especially to the safety of the users or employees.

How are the pressure gauges used?

They work in two different ways. They can be used to compare the air pressure in a container or a vessel like a tire to the pressure with that of a complete vacuum. They can also be used for measuring relative pressure about the air, ambient and outside pressure. The pressure gauges are either mechanical or digital in nature.


The mechanical ones constitute of a gauge which moves as the pressure changes. This gauge has a pointer which indicates the measured reading. The digital pressure gauge provides digital readouts.

Types of pressure gauges

These are the various types of pressure gauges

Bourdon tube

It is the most commonly used pressure gauge. It is mainly used for measuring high pressures. This gauge is designed with a coiled tube which can straighten out when there is an increase in pressure.

The diaphragm

This is another type of pressure gauge that is used in measuring the sensitive pressure changes. It consists of a flexible membrane which separates the two regions which are under different pressure. Te deflection diaphragm’s membrane is used in determining the desired pressure. Its deflection or deformation of the diaphragm is dependent on the pressure variation between the two sides or faces. Its reference face is either exposed to the atmosphere for measuring the pressure or sealed in a vacuum to measure the absolute pressure. The amount of deformation is measured using the following techniques; optical, capacitive or mechanical.

Applications of pressurized systems

These systems are found in different places. The car’s brake fluids, fuel, and lubricants are all pressurized. The air in the tires is also under pressure. These pressurized systems are also used in the industrial setups for coordinating the various control systems.


The control systems controlled by pressure changes are designed in different sizes and shapes. Workers should be able to monitor the changes in pressure. This would help them in identifying the safety concerns when the pressures are extremely low or high. Extreme changes in pressure could lead to failure of the various systems or even endanger the lives of people.