The ornamental design for a gasdetector, as shown and described.
FIG. 1 is a top and front and right side perspective view of the gas detector showing the new design;
FIG. 2 is a right side view of the embodiment of FIG. 1;
FIG. 3 is a front view of the embodiment of FIG. 1;
FIG. 4 is a top view of the embodiment of FIG. 1;
FIG. 5 is rear elevation view of the embodiment of FIG. 1;
FIG. 6 is a left side view of the embodiment of FIG. 1;
FIG. 7 is a bottom view of the embodiment of FIG. 1;
FIG. 8 is a top and front and right side perspective view of the gas detector showing the new design and having a cap covering the top of the gas detector;
FIG. 9 is a right side view of the embodiment of FIG. 8;
FIG. 10 is a front view of the embodiment of FIG. 8;
FIG. 11 is a top view of the embodiment of FIG. 8;
FIG. 12 is rear elevation view of the embodiment of FIG. 8;
FIG. 13 is a left side view of the embodiment of FIG. 8; and,
FIG. 14 is a bottom view of the embodiment of FIG. 8.