Diaphragm pressure gauge – Diagram , Application ,Advantages

Pressure gauge with diaphragm is pressure gauge which uses diaphragm to measure pressure. The meaning of diaphragm is a material which easy to bend or so-called membrane, which is usually made ​​of thin metal, leather, rubber, clan, etc. The working principle pressure gauge with diaphragm is shown in Figure 1 based on the resilience properties of metal / thin plate due to the curvature of iteration pressure at membrane plane, the membrane device is used to measure the difference of two different pressures.

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The ability of pressure gauge with diaphragm to read the different pressure is based on:

  • The area of ​​membrane.
  • Thick membrane.
  • Type of membrane material.
Diaphragm pressure gauge
Diaphragm pressure gauge

The advantages of pressure gauge with diaphragm as follow:

– Very sensitive due to changes in pressure
– Can be used to measure the height of liquid surface
– Can be used for different pressure
– Can be used at transmitter
– Can be used to measure flow

Diaphragm pressure gauge Diagram :

Pressure Gauge with Diaphragm
Pressure Gauge with Diaphragm

Types of diaphragm pressure transducers

Two types of diaphragm are generally used:

1) Metallic diaphragm gauge – It consists of a thin flexible diaphragm made of materials such as brass or bronze. The motion of the diaphragm operates an indicating or a recording type of instrument.

This type of gauge is capable of working in any position and is portable, and therefore well adapted for use or for installation in moving equipments such as aircrafts.

2) Slack diaphragm gauge-  It is more difficult to measure pressure below the atmospheric pressure because the changes are small. The full range from atmospheric pressure to a perfect vacuum is only 14.7 psi (1 kg/cm2)

A slack diaphragm gauge with a weak spring and a large area can be used over pressure ranges as low as 0.01- 0.40 mm Hg (torr). It is possible to achieve accuracies of 1-2%.

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