So, a pressure gauge is crucial for overall plant safety. This post discusses the working principle and other details of a pressure gauge. There is inner pressure and outer pressure. So, when pressure is applied on the surface of the object, it is more on the inner side as the pressure area is less.
Bourdon pressure gauges are widely used across industries, and they work on this principle. Digital pressure gauges are nowadays commonly used.
In case of digital pressure gauges, the AC and DC power supplies play a major role. The switching circuit or AC is converted to DC. The measured pressure is transmitted to the sensor diaphragm which senses the pressure, based on which an electrical signal is generated to reach to the computer or smartphone. These gauges come with a small LCD display. Pressure gauges range from basic measuring ones to completely automated ones, which can be connected to your smartphone to send alerts.
This is one of the main causes of failure of the pressure gauges. Abad Controls. Foc Follet, 39 baixos E Barcelona. Legal notice Privacy policy Cookies policy. Although this change in cross-section may be hardly noticeable, and thus involving moderate stresses within the elastic range of easily workable materials, the strain of the material of the tube is magnified by forming the tube into a C shape or even a helix, such that the entire tube tends to straighten out or uncoil, elastically, as it is pressurized.
In practice, a flattened thin-wall, closed-end tube is connected at the hollow end to a fixed pipe containing the fluid pressure to be measured. As the pressure increases, the closed end moves in an arc, and this motion is converted into the rotation of a segment of a gear by a connecting link that is usually adjustable. Bourdon tube operation is simple. They consist of a semicircular and flat tube of metal, fixed at one end and attached to a sensitive lever mechanism at the other. As pressure increases inside the tube, the force of the fluid attempts to straighten out the curved tube.
The tube then pulls away from the lever, which being connected to the needle on the display, shows the pressure at the fluid port. While bellow gauges function similarly to Bourdon tubes, they differ in the fact that they use a spring to judge the amount of energy to push the dial. The spring is expanded and compressed by the pressure in the tubes and the energy created by that movement is transferred into gears that move the pressure dial.
The pressure range at which the gauge will be working is a primary selection factor for the type of material used to make the gauge.
Gauges operating at higher pressures generally tend to be made of materials such as steel; when operating at lower pressures, they tend to be made of bronze. The use of test-point adapters at various locations on the hydraulic system allows for measurement during troubleshooting without having to purchase dozens of pressure gauges.
The test-point fitting attaches to the gauge, which can be screwed onto the test points throughout the circuit, allowing you to connect under pressure to measure at various points in the system. Whether used for testing equipment or operating machinery, the right pressure gauge helps reduce costly downtime.
In mechanical gauge applications for hydraulic systems, the common threats to gauge reliability are vibration, pulsation and pressure spikes.
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