The ornamental design for a mountingdevice for pivotably mounting a fill levelradar to a container, as shown and described.
FIG. 1 is a first view of an ornamental design of an exemplary embodiment of a mounting device for pivotably mounting a fill level radar to a container showing our new design;
FIG. 2 is a second view thereof;
FIG. 3 is a third view thereof; and,
FIG. 4 is a fourth perspective view thereof.
The broken lines shown in FIGS. 1-4 are included for illustrative purposes only and form no part of the claimed design.