Journal of Applied Physiology
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J Appl Physiol 10: 210-214, 1957;
8750-7587/57 $5.00
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Evaluation of Three Types of Respiratory Flowmeters

Donald L. Fry 1, Robert E. Hyatt 1, Charles B. McCall 1, and Alexander J. Mallos 1

1 From the Laboratory of General Medicine and Experimental Therapeutics, National Heart Institute, National Institutes of Health, Bethesda, Maryland

The physical properties of three types of respiratory flowmeters were evaluated and discussed. The three types of meters studied had flow resistive elements consisting of concentric cylinders (meter A), of 2–325/in. screens (meter B) and of parallel vertical plates (meter C). Meter C gave a linear indication of flow to 12 l/sec. The calibration factors of meters B and C were minimally affected by condensation. The dead spaces of meters A, B and C were 41, 310 and 85 ml, respectively. The over-all impedance to respiratory flow was least in meters B and C. With certain restrictions all meters had good dynamic response curves.

Submitted on September 21, 1956






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