How does pressure gauge work?


A pressure gauge is a measuring instrument used to measure the level of pressure in a liquid or gas, across industries. It is a crucial instrument as it also helps control the levels of pressure in liquids and gases and keep them in the required limit. It raises an alarm in case the pressure exceeds. This is important from a safety perspective because an instrument or machine may explode if the pressure level exceeds and goes unnoticed for a long time. This may harm the workers as well as damage the equipment. So, a pressure gauge is crucial for overall plant safety. This post discusses the working principle and other details of a pressure gauge.

Working Principle of a Pressure Gauge

The working principle of pressure gauges is based on Hooke’s law, which states that the force required to expand or compress a spring scales in a linear manner with regards to the distance of extension or compression. There is inner pressure and outer pressure. So, when pressure is applied on the surface of the object, it is more on the inner side as the pressure area is less. Bourdon pressure gauges are widely used across industries, and they work on this principle.


Other Important Details of Pressure Gauges

Pressure gauges range from basic measuring ones to completely automated ones, which can be connected to your smartphone to send alerts. Pressure sensors are crucial components of pressure gauges. There are various types of pressure gauges in the market such as commercial gauges, general service gauges, stainless steel industrial pressure gauges, differential pressure gauges, double-sided pressure gauges, and so on. With so many choices, it is obvious to get confused. Among various factors, the size of an application must be one of the key considerations when it comes to choosing the pressure gauges for any process. These pressure gauges need to be serviced and maintained regularly as an out of service gauge is as much a threat to the plant as not having one. So, it is always better to have few but well-serviced gauges in your plant. From an accuracy perspective, installing and correct calibration of the pressure gauge are important aspects. Calibration can be a complicated task and needs to be done by experts, after considering the application requirements.

A Focus on Double-Sided Pressure Gauges
Double-sided pressure gauges are one of the most important types of pressure gauges. They are widely used in industries such as chemical and oil & gas. Here are some beneficial features of double-sided pressure gauges:

Mostly made of a plastic body, they have a heavy duty rugged design.
They are resistant to chemicals, corrosion, abrasive materials, high temperatures and so on.
They are highly accurate and compatible in multiple pressure ranges.
They have a Bourdon tube Teflon diaphragm.
You do not require any filling for these gauges, as they are pre-filled with glycerin or optical silicone gauge fluid.
They come with a polycarbonate lens, which has a high impact resistance and a colored display with bright range tabs.
They come with a dual scale and you can choose the unit between PSI/KPA and PSI/BAR.
They have an alert mechanism in case the filter or BAG need to be replaced.
These are suitable even in areas where visibility is an issue. You can install on machines or chemical pumps in such areas.

If you are a manufacturer in oil & gas or other such industries, you would need high-quality pressure gauges. Ensure you study all the features of the gauge and the autonomy of its operation, and source them from certified and trusted manufacturers and suppliers.  SPMK is one of the professional  suppliers of various types of pressure gauges and pressure calibrators. We stock gauges made by reputed and trustworthy brands.


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