A new float flowmeter design is presented based on the nuli method, with electric output signal and either manual or automatic current control in a coil to bring the float back to zero position. The instrument concerned is a constriction-type device and based on its theory a simple expression can be derived for describing the input-output relationship in quadratic terms. In addition to a description of the device, the static calibration curves using air at 295.16 ± 0.50 K are also provided for volumetric flowrates ranging from 11 to 16 dm 3 /min and Reynolds numbers between 500 and 800. Typical inaccuracy is 1.8% offlowrate over this range.
A load-cell anemometric sensor is presented for simultaneous measurement of flow rates and flow direction of a fluid. The tests were carried out in steady flow conditions with air temperature of 28.5 ± 0.5 ·C, flow-rate range ofl0-20 mls and a pressure of 101.1 kPa.
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