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Thursday, 17 May 2018

Types Of Pressure Gauges And Its Calibration

Pressure gauges are used to measure the pressure of a container containing any form of compressed gas or liquid. They are extensively used in our day to day life for example measuring the pressure of air in our car tubes‚ measuring gas levels in cylinders etc.
The Pressure Gauges Manufacturers make available these in various styles and specifications. Though, there is a need to get the these products calibrated from time to time in order to ensure accurate results. Calibration process is really imperative for the devices that are used for safety purposes in hospitals or power plants.

What Are The Main Types Of Pressure Gauges?

The Bourdon Tube gauges, capsule gauges and differential pressure gauges are common types of pressure gauges used in the engineering and manufacturing industries. Pressure gauges are defined as a mechanical device, consisting of a moving part inside the gauge that responds or moves whenever there is a change in the pressure and eventually provides a measured reading of the pressure.

What Is A Bourdon Tube Pressure Gauge?

In 1849, Frenchman Eugene Bourdon invented his pressure gauge design. One of the most commonly used pressure gauges in the 21st Century, Bourdon Tube models are a popular choice due to their high level of accuracy and sensitivity.

The Bourdon tube pressure gauge is the original kind of visual measurement device, consisting of a ‘bourdon tube’- a ‘C’ shaped tube that tries to straighten itself when pressure is applied. When this happens, the pointer responds by moving around the dial.

What Is a Capsule Pressure Gauge?

The capsule pressure gauge contains a bellow type element instead of a Bourdon tube and is specifically used to measure low pressure efficiently. The capsule pressure gauge can measure negative values up to 600mbar with a high level of accuracy.
The pressure gauge is made up of two thin diaphragms that are welded together. When the pressure change, it causes the capsule to change shape on both sides of the measuring element. It is then transferred through mechanical movement, causing the pointer to show the pressure measurement. Most capsule gauges are made out of stainle ss steel, making them suitable for use in corrosive environments and gaseous media.
What Is A Differential Pressure Gauge?

Differential pressure gauges use a U-tube to illustrate the difference in pressure between two points. The instrument contains two entrance ports, which are both connected to monitored pressure capacities.
This allows the instrument to display both pressure measurements, making it more efficient than reading the pressure from two gauges and calculating the difference.

There Are Three Types Of Differential Pressure Gauges:
  1. Piston
  2. Dual Diaphragm
  3. All Welded
These three differential pressure gauges are suitable for varying applications and the choice of pressure gauge will depend on specific applications. Dual diaphragms work best with low differential pressure, while all welded pressure gauges are perfect for corrosive atmospheres. Piston differential pressure gauges work best with gaseous media.