We claim the ornamental design for a personnel lift device, as shown and described.
FIG. 1 is a left rear perspective view of a personnel lift device showing our new design;
FIG. 2 is a right rear perspective view thereof;
FIG. 3 is a left front perspective view thereof;
FIG. 4 is a right front perspective view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a front elevational view thereof;
FIG. 8 is a rear elevational view thereof;
FIG. 9 is a top plan view thereof; and,
FIG. 10 is a bottom plan view thereof.
The broken lines shown in the figures are for the purpose of illustrating portions of the personnel lift vehicle and form no part of the claimed design.