38 Field Instrumentation GEN Rev)
Diaphragm pressure sensor •
Single diaphragm: uses only one flexible element.
Single diaphragm •
Capsule diaphragm: uses two flexible elements.
39 Field Instrumentation GEN Rev) Diaphragm capsule
maybe made of phosphor bronze, stainless steel or other metal alloys. Two diaphragms are welded together around the edge to make the capsule. The inside of the diaphragm is then connected to the process pressure and outside pressure is the reference. Outside of the capsule is exposed to the atmosphere (for measuring gauge pressure. Capsule can be enclosed in sealed container so that reference can be either a vacuum or one side of a process pressure. Capsule diaphragm III.
Bellows pressure sensors It is formed from a homogenous piece of seamless tubing. When
pressure is applied to one end, the circular sections expand axially and this motion is used as a measure of the pressure. It is usually made of brass or stainless steel.
Bellows pressure sensors 40 Field Instrumentation GEN Rev)
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