Exac Corporation

Andrew K Levien

Alan M Young

Erik B Dahlin

Sidney V Kaiser

A dual-tube Coriolis flow meter is disclosed in which each tube is formed into a loop and the loops are connected either in series or in parallel flow relationship to allow each loop to accept at least a portion of the flow in a flow line. The loops are elongated in the direction of the flow line. A drive means is disposed between the tubes at a point between the loop extremities and opposite the cross-over points of the loops. Small permanent magnets are attached to each loop to interact with the drive means to impart oppositely directed drive forces to the two loops. Sensors are positioned at the extremities of the loops and include electromagnetic sensing windings carried by the base and disposed between the loops. Pairs of small permanent magnets are carried by each loop end and create magnetic fields which are cut by arcuate portions of the windings to induce signals in the windings that are proportional to the relative motions of the loop ends. The sensitivity of the device may be improved by coupling a resilient linking member between the loop at their drive points. The linking member has the effect of increasing the spring constants of the loops in the drive mode without affecting the spring constants in the Coriolis mode.

Sensor apparatus for mass flow rate measurement system

A single tube parallel flow Coriolis mass flow rate sensor including a single continuous tube folded upon itself in a generally elongated helically looped fashion so that a straight input segment of the loop is positioned in parallel to a straight output segment and the fluid flowing through the loop flows in the same direction in both segments. The extremities of the two straight segments are rigidly joined together and affixed to an enclosing housing. An oscillatory drive mechanism is coupled between the straight segments at their mid-points and a pair of sensing mechanisms are coupled between the tubes at points intermediate the respective ends and their mid-points.

Single tube parallel flow coriolis mass flow sensor

A Coriolis mass flow rate measuring apparatus including at least one elongated and helically configured loop 30 of conduit, a drive mechanism 42 for causing oscillatory movement of a portion of the loop in a direction approximately normal to the direction of flow through the conduit portion and approximately parallel to the central axis of the loop, and one or more detectors 46, 48, 56 for detecting the resulting motion caused by the Coriolis forces exerted on other portions of the loop as a result of the mass flow therethrough and the oscillatory translation thereof.

Growing community of inventors

Menlo Park, CA, United States of America

Andrew K Levien