A pressure gauge is a device that measures and displays the pressure of a fluid or gas. While the specific design may vary depending on the type and application of the pressure gauge, most pressure gauges consist of several common components:
- The dial is the circular face of the pressure gauge that displays the pressure readings. It typically has calibrated markings and a pointer that indicates the current pressure.
- The pointer is attached to the measuring element (e.g., Bourdon tube or diaphragm) and moves across the dial to indicate the pressure reading.
- The case encloses and protects the internal components of the pressure gauge. It is usually made of metal, plastic, or other materials that can withstand the environmental conditions of the application.
- Some pressure gauges have a transparent window on the dial, allowing users to view the readings while protecting the gauge from external elements.
Bourdon Tube or Diaphragm:
- The Bourdon tube or diaphragm is the primary sensing element that deforms in response to changes in pressure. The movement of this element is translated into the movement of the pointer on the dial.
- The movement mechanism connects the sensing element (Bourdon tube or diaphragm) to the pointer, ensuring that the movement of the sensing element is accurately represented on the dial.
- The connection port is where the pressure medium (gas or liquid) enters the pressure gauge. It is connected to the sensing element, allowing the pressure to be measured.
- The connection threads are located around the connection port and are used to attach the pressure gauge to the system or pipeline where pressure is being measured.
Adjustment Screw (Optional):
- Some pressure gauges may have an adjustment screw that allows for calibration or zero-point adjustments to ensure accurate readings.
Fill Fluid (Optional):
- In certain applications, especially those with vibrations or pulsations, a pressure gauge may be filled with a damping fluid to reduce the effects of these external factors on the measurement.
Overpressure Protection (Optional):
- Some pressure gauges include features or mechanisms to protect the gauge from damage due to overpressure conditions.
These components work together to accurately measure and display the pressure in a given system. The specific design and materials used can vary based on factors such as the type of pressure gauge (e.g., Bourdon tube, diaphragm, digital) and the environmental conditions in which it will be used.