A diaphragm pressure gauge measures pressure using a thin, flexible diaphragm that deflects when pressure is applied. This deflection is mechanically amplified and displayed on the dial, allowing accurate measurement of low pressures and pressures involving corrosive, viscous, or contaminated media.

Diaphragm pressure gauges are especially suitable for applications where the process fluid must be isolated from the gauge mechanism. They are often used with diaphragm seals to prevent clogging and protect the sensing element from aggressive chemicals or hygienic process requirements. Available in various diaphragm materials and connection types such as threaded, flanged, or sanitary clamp, these gauges are commonly used in chemical processing, pharmaceuticals, food and beverage, water treatment, and low-pressure gas applications.