Aneroid Barometer and Pressure Gauges — Lesson 3

This lesson covers the principles and applications of the aneroid barometer, diaphragm gauge, and bellow gauge. It begins with an explanation of the aneroid barometer, its constructional features, and its operational principle. The lesson then moves on to discuss the diaphragm and bellow gauges, their working principles, and their advantageous features. The lesson also highlights the importance of temperature and latitude correction in pressure measurements. For instance, the aneroid barometer allows us to couple up the measurement of atmospheric pressure with a gauge pressure measurement for most applications.

Video Highlights

01:20 - The constructional features of the aneroid barometer
13:24 - Diaphragm and bellow gauges
18:10 - Advantageous features of diaphragm and bellow gauges
21:51 - How a diaphragm gauge works
26:21 - Schematic depiction of a bellow gauge

Key Takeaways

- The aneroid barometer is a well-type manometer with a vertical sealed arm, used to measure atmospheric pressure.
- Diaphragm and bellow gauges work on the principle that a structure will deform when a pressure difference is applied.
- The deflection of the diaphragm or the expansion of the bellow can be converted into an electrical signal, which can be used in a control circuit or digitized for computer processing.
- Temperature and latitude correction is crucial in pressure measurements.