Sensor

FIG. 1 is a perspective view of a sensor showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

In these drawings, the solid lines illustrate the claimed ornamental design, whereas the broken lines illustrate unclaimed environmental features and form no part of the claimed design.