The ornamental design of a variable orificeflowsensor, as shown and described.
FIG. 1 is an isometric view of a variable orifice flow sensor incorporating my new design, wherein the portions illustrated in dotted lines form no part of the claimed design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left side elevation view thereof; and,