Properties Of The Diaphragm Gauge

Properties of the diaphragm gauge

The pressure ranges of diaphragm gauges fall between 10 mbar (0,145 psi) and 40 bar (580,15 psi).

For smaller measuring ranges (in the order of the mbar), diaphragms are used with a larger diameter.

This increases the sensitivity of the diaphragm for small pressure differences and also increases the stroke length. Due to the increased sensitivity, the accuracy will be higher. The large stroke length ensures that the transmission mechanism can be equipped with a lower transmission ratio. The latter is useful since, by the very low pressure, the diaphragm exerts less force on the transmission mechanism.

At pressures below 10 mbar, the diaphragm gauge runs up against its limits. To be able to measure such small pressures, the diaphragm should be ultra-thin in order to possess sufficient elasticity, making it no longer reliably stable. The measurement of very low pressures is the scope of the capsule pressure gauge.

Diaphragm pressure gauges are available in accuracy classes from 0.6 to 1 - 1.6 - 2.5 and 4. As always expressed as a percentage full scale. The accuracy is determined among others by the type of material, the thickness, the waveform and the diameter of the diaphragm.

The annular clamping of the diaphragm makes these pressure gauges insensitive to vibrations.

Because of their structure, these gauges provide good protection against overpressure, since the diaphragm is pressed against the upper flange when the pressure is too high. By default, these pressure gauges can resist pressures of about 5 times the full scale value. Compared with the 1.3 times full scale value overpressure protection of a Bourdon tube pressure gauge, this is so much higher. When the upper flange is provided with matching convolutions to the diaphragm, the overpressure protection may even rise to 100 times the full scale value.

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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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