Patent ID: 7168330
Filing Date: 2007-01-30
Classification: G01F,G01L

Abstract:
1. A media flow transducer comprising: an enclosure having an inner bore that defines a port; an inner chamber coaxial with the inner bore and disposed in the enclosure; a sensing tube surrounding at least a portion of the inner chamber; a flow force sensing beam having a first end that extends through the sensing tube toward a signal end of the transducer and a second end that extends through the port outside the enclosure toward a measurement end of the transducer, the flow force sensing beam being configured to sense a flow of media along a media flow axis at the measurement end and transfer a bending moment of the beam to the sensing tube; a flow sensor with measuring portions positioned on the sensing tube along a flow sensing axis that is substantially parallel to the media flow axis that provides a first signal indicative of the media flow rate at the measurement end of the flow force sensing beam and pressure in the sensing tube; a pressure error sensor with measuring portions positioned on the sensing tube along a neutral axis, that is substantially perpendicular and 90° offset from the flow sensing axis, that provides a second signal indicative of the pressure in the sensing tube; and a circuit operative to subtract the second signal from the first signal to provide an output signal indicative of the media flow rate at the measurement end of the transducer compensated for pressure in the sensing tube.