Types of Test Pressure Gauges

August 26, 2022

When working with any type of liquid, gas, steam, or water in a pressurized environment, it is best to use the most suitable test pressure gauge that has been properly calibrated to ensure the most accurate reading. In order to understand the different types of test pressure gauges, it is important to first understand different types of pressure. There are four types of pressure:

  • Sealed pressure or vacuum pressure
  • Gauge pressure
  • Differential pressure
  • Absolute pressure

There are different types of test pressure gauges that measure the different types of pressure, including:

Absolute Pressure Gauge

This device is used to measure pressure that is independent of atmospheric pressure. A vacuum, with zero pressure and no variation, is attached to the measuring element. The media and vacuum chambers are separated by a diaphragm. As pressure rises, the vacuum chamber deforms.

Piezometer Pressure Gauge

This is a type of manometer. It is essentially a glass tube with two openings used to measure the medium pressure of liquid. One end is open to the atmosphere while the other is connected to a pipeline where the pressure needs to be measured in a liquid. The height of the liquid indicates the pressure.

Bourdon Tube Pressure Gauge

A digital readout indicates the pressure present when a curved tube straightens out as pressure is applied. The change in pressure information is sent to a rotary gear with a pointer.

Diaphragm Pressure Gauge

The working principle of this device is similar to that of the Bourdon pressure gauge. The difference between applied and reference pressure is indicated through the diaphragm.

Bellows Pressure Gauge

This pressure gauge is extremely sensitive and used for low pressure readings.

Capsule Pressure Gauge

These gauges are primarily used for measuring the pressure in gas.

Differential Pressure Gauge

This pressure gauge is used to measure the difference in pressure between two pressure points.

Manometer Pressure Gauge

One column of fluid is measured against another to determine pressure when using this device.

What are Test Pressure Gauges?

A test pressure gauge is a device or an industrial piece of equipment that is generally used to measure and visually indicate pressure or pressure fluctuations. Essentially, these devices measure the pressure in an environment.

The test pressure gauge is exceptionally important as pressure plays a vital role in many applications and industries, such as in the field of science or in an industrial setting. A test pressure gauge typically measures the pressure of liquid, gas, water, or steam within a pressure system. The device aims to measure the difference in pressure between two pressure points or the pressure inside a vacuum.

It is critical that the test pressure gauge is accurate. To ensure that gauges work as intended, it is advised to calibrate the pressure gauges frequently. Testing, calibration, and validation are often conducted before as well as during any application.

Precision test gauges

A precision test gauge is a high accuracy test gauge that is used to calibrate other gauges and is often used in quality control. Additionally, these gauges may be used in fittings in laboratories or used to measure pressure in tanks and pipes.


There are several advantages to using the correct test pressure gauge in your business:

  • Accurate readings
  • Complying to International OHS standards
  • Travel ready

Mid-West Instrument

Since 1958, Mid-West Instrument has been a leading global manufacturer of differential pressure gauges, transmitters, and switches. Our company is family owned and operated from our facility located in Sterling Heights, MI.

Our state of the art factory is equipped the latest CNC machine tool technology, test equipment, calibrations standards, and oxygen clean room.  This allows us to maintain precise tolerances and product quality with the shortest lead times in the industry.

Contact our experienced professionals or visit our website to learn which differential pressure instrument best fits your application.