June 13, 2021

The bellows pressure sensor is a one-piece, collapsible, seamless metallic unit that has deep folds formed from very thin-walled tubing. It looks like a stake of capsules. It is more sensitive than the diaphragm and capsule pressure sensors. The diameter of the bellows ranges from 1.2 to 30 cm and may have as many as

In order to improve the sensitivity, two corrugated diaphragms are combined by arranging these in back-to-back and sealed together at the periphery to obtain shell-like shape as shown in fig(capsule pressure sensor) . These are called as capsules. One of the diaphragms is provided with a central reinforced port to allow the pressure to be

The diaphragm pressure sensor uses the elastic deformation of a diaphragm (i.e. membrane) to measure the difference between an unknown pressure and a reference pressure. Diaphragm is a thin circular elastic membrane made of generally silicon as show in fig. As pressure changed, the diaphragm moves, and. this motion is the measure of differential pressure.

This is an example for absorption type hydraulic dynamometer. Principle: When a conducting material moves through a magnetic flux field, voltage is generated, which causes current to flow. If the conductor is a wire forming, a part of a complete circuit current will be caused to flow through that circuit, and with some form of