Pressure measuring equipment typically consists of several key components that work together to accurately measure and display pressure readings. Here’s an overview of the main components commonly found in pressure measuring systems:

1. Sensing Element

• Bourdon Tube: A curved metal tube that straightens under pressure. The movement is converted into a readable measurement.

• Diaphragm: A flexible membrane that deflects under pressure, translating the pressure change into a mechanical movement.

• Capsule: Similar to diaphragm gauges, this component consists of two diaphragms that form a capsule, used for low-pressure applications.

• Piezoelectric Sensor: A material that generates an electrical charge when subjected to pressure, commonly used for dynamic pressure measurements.

2. Transducer/Transmitter

• Conversion Mechanism: Converts the mechanical movement or pressure change from the sensing element into an electrical signal (e.g., voltage, current) for transmission to a display or control system.

3. Display Unit

• Analog Display: A dial with a pointer that indicates the pressure reading on a scale.

• Digital Display: Provides a numerical readout of pressure values, often with additional features like alarms, data logging, or connectivity options.

4. Connection Fitting

• Process Connection: The interface that connects the pressure measuring device to the system being monitored, ensuring a secure and leak-free fit. This can include threaded, flanged, or welded connections.

5. Housing/Enclosure

• Protective Casing: Shields the internal components from environmental factors like dust, moisture, and mechanical damage. This is especially important in industrial settings.

6. Calibration and Adjustment Features

• Zero Adjustment: A mechanism that allows users to calibrate the device to read zero pressure accurately.

• Span Adjustment: Used to adjust the full-scale output of the instrument to match the measurement range.

7. Power Supply

• Power Source: Many modern pressure measuring devices require a power source, which can be AC, DC, or battery-operated, especially for portable units.

8. Output Interface

• Analog Output: Commonly in 4-20 mA or 0-10 V formats for integration with control systems.

• Digital Communication: Protocols such as HART, Modbus, or Fieldbus for data transmission to control systems or monitoring software.