What are the three categories of flowmeters commonly used in medical practice?

In the context of medical practice, flowmeters are essential for accurately measuring and controlling the flow of gases, particularly in respiratory therapy and anesthesia. The three categories of flowmeters commonly used are flow restrictors, Bourdon gauges, and Thorpe tubes. Each type has specific applications and operates based on different principles.

Flow restrictors are devices that allow gas to flow at a limited rate regardless of the pressure behind them, making them useful in situations where a constant flow is required without the need for further adjustment. They are often used for simple applications where flow control is less critical.

Bourdon gauges measure pressure and are particularly effective for high-pressure gases. They typically consist of a coiled tube that straightens as the pressure increases, moving a needle along a dial to indicate the pressure level. This type is commonly found in compressed gas delivery systems.

Thorpe tubes, on the other hand, are variable flow rate devices that allow users to see flow rates directly in terms of volume per time, usually indicated by a floating ball in a tapered tube. Their clear design allows for easy visual assessment of the flow rate, making them ideal for settings that require precise adjustments.

These categories encompass fundamental types of flow measurement tools used in medical gas applications, each tailored to