Compensated vane airflow meter

Details Compensated vane airflow meter Compensated vane airflow meter

G - Physics

01

F

73/132

G01F 1/28 (2006.01) G01F 15/04 (2006.01)

Patent

CA 1161663

360-77-0540 ABSTRACT OF THE DISCLOSURE An airflow sensor with a rectangularly shaped sensing vane is disclosed. The vane is pivotally mounted in a cylindrical bore perpendicular to the airflow direction of the sensor and yields an airflow signal proportional to its angular rotation. An air motor mechanically coupled to the vane maintains a constant pressure drop across the vane. The air motor assists in pivoting the vane by magnifying the force on the vane for changes in airflow. In one embodiment, a gas filled bellows modifies the positioning of the vane by the air motor to compensate for temperature and barometric variations. In another embodiment, an absolute pressure sensor, located between the vane and a throttling member, compensates for barometric changes and transient delays in the response of the vane.

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