Flat And Corrugated Diaphragms Gauge

FLAT AND CORRUGATED DIAPHRAGMS FOR PRESSURE GAUGE

The diaphragm must be made in such a way that the deflection is linear, i.e. that a similar increase in the pressure should always correspond to a similar deflection of the diaphragm.

A flat diaphragm made of metal will only be linear when the deflection is very small, too small to have sufficient movement of the pointer.

At larger deflections, a flat diaphragm loses its linearity since more and more stress will occur in the diaphragm. The diaphragm becomes increasingly stiffer due to the growing tension, resulting in less deflection of the diaphragm for a similar increase in pressure.

A flexible material, such as a thin sheet of nylon, can however serve as a flat diaphragm. The diaphragm will then be opposed by a calibrated spring which ensures the linearity and pushes the diaphragm back to its starting position.

For industrial applications, usually corrugated metal diaphragms are being used. The corrugations ensure that the diaphragm will be more elastic and they are arranged such that the deflection of the diaphragm is linear. There are different types of corrugated profiles as you can see in the figure below.

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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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