Differential pressure gauges

A differential gauge can measure the differential pressure in two separate pressure systems. They dispose of two connections: one for high (+) and one for low (-) pressure. At EMVO Techniek we have got many different types of differential gauges in stock. They are based on two operating principles:

• With Bourdon tube;
• With diaphragm.

Bourdon tube

A pressure gauge with a Bourdon tube measures pressure using a little metal U shaped tube. The tube is flexible and when the pressure of the measured medium increases, the tube will deform. That movement causes the needle in the display to move and indicate the pressure on a scale.

Diaphragm

This type of pressure gauge uses a thin, flexible diaphragm that will deform according the increase or decrease of fluid or gas pressure in a system, which will result in a movement of the pointer in the display. The diaphragm separates the interior mechanism of the pressure gauge from the media to be measured, which makes this type very appropiate for use in for example corrosive, polluted or viscous media.

Functioning in differential gauges

The functioning of the Bourdon and diaphragm principle in differential gauges is comparable to that of a regular pressure gauge.

Differential gauge with Bourdon tube

In this type of differential gauge, two separate Bourdon tubes will provoke one or two indicators to start moving. If only one needle is applied, it will indicate the differential pressure on the scale. If two needles are used, one needle will indicate high pressure, and the other one low pressure. In this last case, pressure in both systems as well as the differential pressure can be measured.

Differential gauge with diaphragm

Two pressure chambers are separated bij a diaphragm. When pressure in one of them changes, the balance between the two chambers is disrupted and the diaphragm will caus a needle to start moving in the display, where differential pressure can be read.

Contact

Do you have any questions or do you need any help choosing the right differential gauge? Please feel free to contact us; our experts will be happy to help you.