The ornamental design of an optical gassensor, as shown and described.
FIG. 1 is a top perspective view of the ornamental design of the optical gas sensor, wherein solid lines illustrate upper and lower portions of the optical gas sensor, and broken lines illustrate a circuit board and other features that form no part of the claimed ornamental design;
FIG. 2 is a top elevational view of the ornamental design of the optical gas sensor of FIG. 1;
FIG. 3 is a bottom elevational view of the ornamental design of the optical gas sensor of FIG. 1;
FIG. 4 is a right elevational side view of the ornamental design of the optical gas sensor of FIG. 1;
FIG. 5 is a left side elevational view of the ornamental design of the optical gas sensor of FIG. 1;
FIG. 6 is a rear elevational view of the ornamental design of the optical gas sensor of FIG. 1; and,
FIG. 7 is a front elevational view of the ornamental design of the optical gas sensor of FIG. 1.
In these drawings, the solid lines illustrate the claimed ornamental design, whereas the broken lines illustrate environmental features that from no part of the claimed ornamental design.