Why is the use of a fixed orifice in flowmeters significant?

The significance of using a fixed orifice in flowmeters mainly lies in its ability to simplify the design and usage of the device. A fixed orifice allows for consistent and straightforward measurement of gas flow rates by creating a defined path through which the gas must travel. This not only reduces the complexity of the system but also minimizes the potential for variations in flow due to changing system pressures.

With a fixed orifice, the design remains uncomplicated, making the flowmeter easier to manufacture, maintain, and operate. As a result, it typically requires less calibration and can be operated without extensive training, contributing to more reliable everyday use in clinical settings. By having a predetermined size and shape, the fixed orifice facilitates predictable flow patterns, which assists healthcare professionals in delivering accurate therapeutic interventions with gases.

In summary, the use of a fixed orifice in flowmeters is primarily significant for its simplicity and the operational ease it provides, leading to reliable performance in respiratory care applications.