Pressure Gauges

One of the most common types of pressure measurement devices, assisting workplace safety and effective machine operation.

They are a stalwart of any system where the measurement of pressure is involved and can be used in a wide range of applications, from measuring the pressure of air in car tyres, right through to the accurate differential pressure measurement of highly toxic gases on a petrochemical refinery.

The two main types of gauges are liquid filled and dry pressure gauges. Liquid pressure gauges are also commonly known as glycerine filled pressure gauges, as they are usually filled with a type of oil called glycerine, providing extreme accuracy when measuring pressure. Commonly used in adverse conditions, they may occasionally be filled with other types of liquid, such as silicone. On the contrary, dry pressure gauges are used in general applications and are commonly known as the ‘traditional’ form of pressure measurement.

At MGA Controls, we stock a wide range of pressure gauges, including dry and glycerine pressure gauges in a range of sizes, pressure ranges and materials. We are leading instrumentation and control suppliers, with over 25 years’ experience in the industry and unparalleled knowledge. If you require a pressure gauge, we have the knowledge and expertise to find the right solution for your specific application.

If you require more information about pressure gauges, the boxes and PDF downloads below answer some frequently asked questions about pressure gauges. If you require information about our range of pressure measurement devices please contact us today, on 01704 898980 or email, our team of experts are on hand to answer questions about our pressure gauge devices with your enquiry.

PDF downloads

Frequently asked questions

Advantages of liquid filled pressure gauges

One of the main causes of pressure gauge failure is due to vibration resistance. Liquid filled pressure gauges offer superb shock and vibration resistance and are therefore commonly used in high stress environments. Liquid pressure gauges are able to provide extreme precision and accurate readings, due to the weight of the liquid positioning the pointer.

A huge advantage to the liquid filled pressure gauge is the lack of condensation. Often, pressure gauges have a build-up of condensation due to humidity issues, which can often lead to visibility issues when reading the measurement. Liquid pressure gauges are designed to prevent any moisture entering the casing of the gauge, minimising condensation.

What is a capsule pressure gauge?

A Capsule Pressure Gauge is specially designed to measure low pressure signals, and employs the use of a welded capsule with two thin diaphragms. One diaphragm measures the pressure signal, and the other is used as a reference point. The relative deflection of the capsule is then traslated through mechanical linkages to a rotational movement of the gauge pointer around the dial.

Advantages of dry pressure gauges

Known as the traditional pressure gauge, dry gauges one of the original pressure measurement devices. They are commonly used in general applications, as they aren’t shock resistant like liquid filled gauges. If necessary, many dry pressure gauges can be altered to house an oil or liquid, making the gauge multi-functional, as both a dry or liquid pressure gauge.
Dry pressure gauges are available in a range of materials, making the casing durable and resistant to corrosive environments. The most common dry pressure gauge material is stainless steel. Advantages of dry pressure gauges include their ability to withstand corrosion and waterproof casing.

What is a contacts gauge?

A Contacts Gauge is a pressure measurement device that contains an electrical or inductive contact and can be used in a variety of ways. Most commonly, Contacts Gauges can be wired to other instrumentation for monitoring or switching purposes. The switching point of the contact can be easily adjusted by turning a small knob in the centre of the gauge window. In the event that the pressure exceeds the contact set point, a number of functions can be performed depending on the configuration of the switch (common operations are ‘make on rise’ or ‘break on rise.’

For more information, please click to view our dedicated Contacts Gauge page.


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