Home » Measuring instruments » Mechanical Pressure Gauges: Types, Working, Applications, Advantages

Mechanical Pressure Gauges: Types, Working, Applications, Advantages

In this post, you will learn what is a Pressure gauge and how it is done with Its Working principles, Applications, Advantages, Types of pressure gauges, and more

Mechanical Pressure Gauges

Pressure measurement is the study of the force applied by a fluid to a surface. Pressure is usually calculated in units of force per unit of surface area. The pressure gauges or mechanical gauges are the devices used for measuring the pressure by balancing the column of fluid by spring or dead weight.

Types of Pressure Gauges

Following are the commonly used mechanical pressure gauges:

  1. Diaphragm pressure gauge
  2. Bourdon tube pressure gauge
  3. Bellows pressure gauge
  4. Dead-weight pressure gauge

1. Diaphragm Pressure Gauge

A mechanical pressure-measuring instrument used to measure pressure above or below the atmospheric pressure. It is usually employed to measure relatively low pressures. A diaphragm pressure gauge, in its simplest form, consists of a corrugated diaphragm as shown in the figure.

Diaphragm pressure gauge

The gauge is connected to the fluid which is under pressure causing some deformation of the diaphragm. With the help of a pinion system, elastic deformation of the diaphragm rotates the pointer. This pointer moves over a calibrated scale, which directly gives the pressure.

Read Next:

Advantages of Diaphragm Pressure Gauge

  1. This is good for low pressure.
  2. It is inexpensive.
  3. It has a wide range
  4. Used to measure gauge, atmospheric and differential.
  5. it is very reliable.

Disadvantages of Diaphragm pressure gauge

  1. Impact resistance is not good.
  2. Difficulty in maintenance.
  3. Lower measurement pressure.

2. Bourdon’s Tube Pressure Gauge

A mechanical pressure-measuring instrument employing as its sensing element a curved or twisted metal tube flattened in cross-section and closed known as the Bourdon tube.

Bourdon's tube pressure gauge

It is a device for measuring the pressure of gases or liquids. It consists of a semicircular or coiled, flexible metal tube connected to a gauge, which records the degree to which the tube is straightened by the pressure of the gas or liquid inside. Generally, it is used for measuring high pressures.

The instrument is connected to the fluid which is under pressure and flows into the Bourdon’s tube. As a result of the increased pressure, the tube tends to straighten itself. Since the tube is encased in a circular cover, therefore it tends to become circular instead of straight.

With the help of a simple pinion and sector arrangement, the elastic deformation of the Bourdon’s tube rotates the pointer. This pointer moves over a calibrated scale, which directly gives the pressure.

Advantages of Bourdon Tube Pressure Gauge

  1. Construction is simple and the cost is low.
  2. It has excellent sensitivities.
  3. It has high accuracy.
  4. This gauge is available for various ranges

Disadvantages of Bourdon Tube Pressure Gauge

  1. Slow response to a change in pressure.
  2. Prone to shock and vibrations.
  3. It is subjected to hysteresis.
  4. Not available for the low-pressure condition.

Application of Bourdon Tube Pressure gauge

  1. Gas distribution system.
  2. Used in the hydraulic installation.
  3. Used in pneumatic installation.

3. Bellows Pressure Gauge

It is a device, the pressure-responsive element is made of a thin metal tube with a deep circumference when the pressure changes as the elastic elements increase or decrease.

Bellows pressure gauge

A pointer is connected to it which indicates reading on the circular dial. It expands when the pressure increases and when the pressure is low the elastic elements in the pressure gauge contract.

That’s it. Thanks for reading if you have any questions about “Types of Pressure Gauge” ask in the comments. If you found this post helpful then please share it with your friends.

[jetpack_subscription_form show_subscribers_total=”false” button_on_newline=”false” custom_font_size=”16px” custom_border_radius=”0″ custom_border_weight=”1″ custom_padding=”15″ custom_spacing=”10″ submit_button_classes=”has-contrast-border-color has-background has-accent-background-color” email_field_classes=”has-contrast-border-color” show_only_email_and_button=”true” success_message=”Success! An email was just sent to confirm your subscription. Please find the email now and click ‘Confirm Follow’ to start subscribing.”]

Download PDF of this article:

Read also:

About Saif M

Saif M. is a Mechanical Engineer by profession. He completed his engineering studies in 2014 and is currently working in a large firm as Mechanical Engineer. He is also an author and editor at www.theengineerspost.com

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.