Discuss various pressure measuring devices along with schematic diagram.

Pressure measuring devices, also known as pressure gauges, are used to measure the pressure in a system or container. There are several types of pressure measuring devices, each with its own unique characteristics and uses. Here are a few examples:

1. Manometer: This is the simplest type of pressure measuring device. It consists of a U-shaped tube filled with a liquid (usually mercury or a colored water solution). One end of the tube is connected to the system whose pressure is to be measured, while the other end is left open to the atmosphere. The difference in height of the liquid in the two arms of the tube gives the pressure of the system.

   Schematic Diagram:

2. Bourdon Tube Gauge: This device consists of a curved tube, which straightens out when pressure is applied. The movement of the tube is then translated into a dial reading through a system of mechanical linkages.

   Schematic Diagram:

3. Diaphragm or Capsule Gauge: These gauges consist of a flexible diaphragm or capsule which expands or contracts based on the pressure applied. This movement is then translated into a dial reading.

   Schematic Diagram:

4. Bellows Gauge: This device consists of a set of expanding and contracting bellows. The movement of the bellows is used to move a pointer on a dial.

   Schematic Diagram:

5. Electronic Pressure Sensors: These devices use a variety of techniques to convert pressure into an electrical signal. Some use piezoelectric materials, which generate a voltage when pressure is applied. Others use capacitive techniques, where the pressure changes the capacitance of a circuit.

   Schematic Diagram:

Each of these devices has its own advantages and disadvantages, and the choice of which to use depends on the specific requirements of the application.