Ship set to sun set

What is a pressure gauge?

What is...

What is a pressure gauge?

In this edition of our new series of blog posts “What is…” you can read about pressure gauges. Their function and different types. And why is there liquid in some pressure gauges?

We all know it, putting too muchWat is een manometer pressure on something. This can consider your work, your appearance, your relationship, anything actually. When we speak for ourselves, it’s quite hard to make sure to measure the amount of pressure you should put on something in life. Inmost cases, this results in too much or too little pressure. Seeing ourselves as human machines, this can cause real trouble. Sometimes even leading to depression. But not just us human machines struggle with this problem, real machines do too. Luckily for those, there’s a solution.

What does a pressure gauge do?

Even though a pressure gauge looks like a stopwatch, measuring time is not what it does. A pressure gauge is essential, since it shows the pressure in a liquid or gas in a process or a machine on an analogue scale. From the reading it can be determined if the current pressure in the system is still acceptable. Without pressure gauges, machines wouldn’t be as reliable and predictable as they are with them.

Types of pressure gauges

For different types of use, there are different types of pressure gauges. The most common ones are:

  • Bourdon pressure gauges. These are used for measuring medium to high pressures. Out of these three, this one is used the most.
  • Diaphragm pressure gauges. This type is suited for all amounts of pressure and is protected against failure as a result of high overpressure. Also, this type of pressure gauges is suited for critical media, like acids.
  • Capsule pressure gauges. This type of gauges is used for low pressure measurement.

The pressure gauges above function in different ways. Besides functionality, they differ themselves in size. 40, 63, 80, 100 and 160 mm are the most common diameters. Pressure gauges also differ themselves in scale range. This varies from 0 … 0,5 mbar to 0 … 6.000 bar. Depending on needs, the materials are chosen. For example, there are pressure elements made of brass, stainless steel or special materials. The connection is also completely customized to best fit the situation.

Why is there liquid in some pressure gauges?

Some pressure gauges contain liquid in the scale. This liquid is called glycerin. Other liquids like silicone are also being used in these pressure gauges, but glycerin is the most popular one. This filling liquid serves as dampening for the moving parts in the pressure gauges’ casing. Pressure gauges may have to endure a lot of vibrations, which can cause damage. When it’s filled with liquid, the chance of damage will reduce. Also humidity can be a problem for dry pressure gauges. Combined with low temperatures, this can even result in icing. Another consequence of this humidity can be condensation, which makes reading the pressure gauge difficult.

Know your pressure

Even though preventing human depression isn’t that easy. It is for machines. We can help you out with that last one. We understand that we would be putting a lot of pressure on you if we asked you to tell us which kind of pressure gauge you require. But that’s what we’re here for, since our specialists are happy to give advice about which one suits you best!

General contact

Driemanssteeweg 190
3084 CB Rotterdam
The Netherlands
GMS Instruments Office