How a Differential Pressure Gauge Works

Are you curious about how differential pressure gauges work? Well it’s good for you to know that differential pressure gauges are an important part of a wide variety of applications including dust collection, cleanroom monitoring, pneumatic conveying, air handling, filter monitoring, and many others. These applications all rely on accurate pressure readings to indicate the status of the application and whether something needs to be done to correct the status.

Let’s dig into how these gauges actually work. There are a few important components that make up each gauge; a diaphragm, a spring, a magnet, a needle, and a metal helix. Each component plays an important part in how the gauge functions.

The diaphragm is used to determine the direction the spring moves, either backwards or forwards. When pressure enters the high ports of a gauge, air fills up the high pressure chamber and pushes the diaphragm toward the back of the gauge, pulling the spring with it. The gauges can also be used for negative pressure in which the negative pressure would be applied to the low port of the gauge, which would also pull the spring along with the diaphragm. For differential pressure, both the high and low pressure chambers would fill up with air and push on the diaphragm. In this instance, it’s important that the higher of the two pressures is connected to the high port.

Differential Pressure Gauge Needle

The needle is the visual indicator which moves along a scale to show the pressure or differential pressure being measured. The needle is attached to a metal helix that rotates, allowing the needle to move back and forth.

Differential Pressure Gauge Magnet Helix

The magnet and spring are the final combination of components that make the gauge work. The spring, which we mentioned as being attached to the diaphragm, is also attached to a magnet. This magnet moves with the spring either backward or forward. As the spring moves, the magnet attracts the metal helix, causing the helix to rotate and allowing the needle to indicate the pressure.

The Sensocon Series S2000 Differential Pressure Gauges are a unique combination of components that continue to measure positive, negative, and differential pressures in many different industry applications. You can learn more about these types of pressures here. You can find more information on the Series S2000 by visiting the product page here. For information on all of the other products Sensocon has to offer, visit us at