Describes an instrument that measures gas volumetric flow rate using a capillary tube laminar-flow principle. Presents its construction, operation, accuracy and rangeability. Discusses integrating the differential-pressure- producing flowmeter with appropriate temperature and pressure devices to produce a digital flowmeter system capable of measuring volumetric and mass flow rates. Describes typical applications, such as calibrating fans and blowers.

KEYWORDS: Gases, fluid flow, measuring, instruments, measuring equipment, streamline flow, calibrating, fans, air blowers, capillary tubes