New flow sensor

Citation

(1998), "New flow sensor", Sensor Review, Vol. 18 No. 1. https://doi.org/10.1108/sr.1998.08718aaf.001

New flow sensor

New flow sensor

Positioning flow sensors at proper insertion depths or angles can be difficult. Sensors mounted imprecisely can yield deceptive readings. But, an in-line flow sensor with a built-in paddle wheel automatically aligns itself and will not budge. The sensor from Burkert Fluid Control Systems in Irvine, California, ensures accurate measurements because the paddle wheel is part of a fitting. Electronic modules are attached to the fitting with just a quarter turn of a bayonet-style mounting platform. The mounting contains either a coil or Hall sensor. The open-cell paddle wheel consists of four PVDF blades, each encapsulating a permanent magnet, mounted on ceramic bearings. When liquid flows through a pipe, the paddle wheel rotates, producing a voltage signal proportional to the flow. The induced ac voltage in the transducer is transmitted and determines the flow rate. The sensor measures flow rates as small as 0.3ft/sec. Besides modules that just measure flow, another electronic model handles batch control and can be easily programmed for seven different batch amounts. Fittings for both styles are available in plastic, brass, and stainless steel in sizes ranging from 1.5 to 2 inches. Sensors measure continuous flow of clean or corrosive, solid-free liquids at temperatures up to 212°F.