Diaphragm Pressure Gauge Animation

Diaphragm pressure gauge animation

Diaphragm pressure gauge working principle

The diaphragm pressure gauge consists of a circular membrane, made from sheet metal of precise dimensions, which can either be flat or corrugated.

The diaphragm is mechanically connected to the transmission mechanism which will amplify the small deflections of the diaphragm and transfer them to the pointer.

The animation below shows the pressure gauge working principle. You can see the movement of the diaphragm and the functioning of the transmission mechanism.

The process pressure is applied to the lower side of the diaphragm, while the upper side is at atmospheric pressure. The differential pressure arising across the diaphragm, lifts up the diaphragm and puts the pointer in motion.

The deflection of the diaphragm is very small (+/- 1 mm) making it necessary to use a high-ratio multiplying movement to rotate the pointer along the full length of the scale. The actuation of such a high-ratio transmission mechanism is possible because diaphragm deflection is able to generate large forces.

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Pros:

• The flexible membrane function allows it to be used for more aggressive and contaminated media.

• The cabinet has a diameter of 100 mm and a scale with a division of 0.02 bar, which makes it possible to read the values accurately.

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