Gauge pressure is measured relative to ambient atmospheric pressure. One common method involves using a diaphragm sensor.
Diaphragm Sensor Method
A diaphragm sensor works by comparing the pressure you want to measure to the surrounding atmospheric pressure. Here's how it functions:
- Diaphragm: A flexible diaphragm is the core component.
- Pressure Exposure: One side of the diaphragm is exposed to the pressure media (the fluid or gas whose pressure you want to measure).
- Atmospheric Reference: The other side of the diaphragm is exposed to the ambient atmospheric pressure.
- Deflection and Measurement: The difference between these two pressures causes the diaphragm to deflect or move. The amount of deflection is directly proportional to the difference in pressure (the gauge pressure). This deflection is then measured, often using strain gauges or capacitive sensors, and converted into an electrical signal representing the gauge pressure.
In summary, measuring gauge pressure with a diaphragm sensor involves comparing the pressure of the media to atmospheric pressure and measuring the resulting deflection of the diaphragm.
