Patent ID: 7703336

Claim:
A device for use in a mass flow rate metering system which incorporates a flow medium traveling along a flow path towards a destination, wherein the destination utilizes the flow medium, said device comprising: (a) a flow conduit insertable into at least a portion of the flow path to define a flow channel, said flow conduit having an inlet and an outlet, said outlet including a coupler for establishing fluid communication between the flow conduit and the destination; (b) at least one mark depositor operatively connectable to a signal generator to introduce at least one mark into the flow channel at an introduction location and thereby cause a variation in the flow medium; and (c) a plurality of mark detection sensors each comprising at least one electrode having an associated detection portion disposed in the flow channel in direct contact with said flow medium, each sensor configured to detect variations in the flow medium caused by introduction of said at least one mark.