Importance

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Abstract

A flowmeter utilizing the property of dry saturated steam that the density of the steam is dependent upon the temperature thereof has a first sensor that is a rotation sensor (1) which includes a flap (14) which is disposed in a steam flow passage (12) to be deflected by steam flow so as to rotate a rotatable member (4) of the rotation sensor, and a second sensor that is a temperature sensor (20) for sensing the temperature of the flowing steam. Signals from these two sensors (1, 20) which are, respectively, dependent upon steam flow, and steam temperature and hence density, are processable in process means for obtaining the true mass flow rate of the steam. For other fluids, such as superheated steam, the flowmeter has a third sensor which is a pressure transducer, signals from the three sensor being processable in process means for obtaining the true mass flow rate. The flap (14) is connected to the rotatable member (4) of the rotation sensor through an opening in an otherwise sealed enclosure (8), the sealing being effected by a sealing ring (40) that is disposed between parts, a body (10) and a base plate (38), which are stationary relative to one another.

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First Claim