Abstract
Water passing through the flowmeter causes a free-running rotor to revolve. Rotational speed is measured directly by observing the rotor and timing it, or remotely by electrical impulses transmitted to a counter and recorder. The flowmeter is suitable for applications where water velocity in a pipeline is low and restriction to flow has to be minimal, as for example in thermosiphoning water-heating systems. This instrument has been in continuous use for six months and has worked reliably at mean water velocities down to 2 mm s-1, equivalent to a volume flow rate of 1.66 ml s-1 in a 31.75 mm bore pipe, and at temperatures between 10 and 60 degrees C. Full details of construction are given.
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