Certified Pulmonary Function Technologist (CPFT) Practice Exam

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What is a pressure differential pneumotachometer composed of?

  1. A single large tube

  2. A bunch of little tubes that create laminar flow

  3. A diaphragm and spring mechanism

  4. A rotating fan mechanism

The correct answer is: A bunch of little tubes that create laminar flow

A pressure differential pneumotachometer is designed to measure airflow by assessing the difference in pressure across a flow-resisting element. It consists of a series of small tubes that create laminar flow. The principle of operation relies on the fact that when air flows through these narrow tubes, the flow becomes laminar, allowing for accurate pressure readings. This configuration enables the device to precisely measure the flow rate of gas, as it calculates the pressure drop across the tubes. This method of using a collection of smaller tubes is critical in ensuring that the measurement is not influenced by turbulence, which can distort results. The layout and design optimize the laminar flow condition, facilitating accurate assessment of respiratory function.

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