The ornamental design for gas mask with thermal sensor, as shown and described.
FIG. 1 is a front elevation view of the gas mask with thermal sensor of the present invention.
FIG. 2 is a left side elevation view of the gas mask with thermal sensor.
FIG. 3 is a right side elevation view of the gas mask with thermal sensor.
FIG. 4 is a top plan view of the gas mask with thermal sensor; and,
FIG. 5 is a bottom plan view of the gas mask with thermal sensor.
The broken line showing of portions of the article immediately adjacent the shaded areas is included for the purpose of illustrating environmental structure with the lines themselves and the areas within forming no part of the claimed design.