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Differential Pressure Sensors

Piston Gauge vs. Diaphragm Gauge Comparison

How Pressure Differential Sensors Work
View our piston differential pressure gauges
View our diaphragm differential pressure gauges

Differential pressure sensor models

Below, a 15 psi differential in pressure results in movement of the spring-loaded sensor (piston or diaphragm) from the high pressure port to the lower pressure port (left to right). The sensor magnet induces a rotation in the pointer magnet and the attached pointer. The pointer reflects the 15 psi differential on the dial scale. A reed switch actuates as the differential pressure sensor magnet moves into close proximity.

Differential Pressure Sensor Diagram

Piston vs. Diaphragm Differential Pressure Sensors

Our piston differential pressure sensor models are primarily designed for liquid applications. They exhibit a slight amount of bypass as the fluid migrates from the high to the low pressure port. Because gas molecules are smaller, the migration is often deemed too great for the application. We incorporate a flexible Teflon cup seal in our differential pressure sensor, which keeps the bypass very low.

In our diaphragm differential pressure sensor models the high and low-pressure ports are completely isolated from each other. There is no bypass and therefore they are appropriate for air or gas along with liquids. They also come in a variety of sizes allowing for very sensitive measurements. Consider some of our diaphragm differential pressure sensor models for the addition of a diaphragm seal. Contact us for details.