The ornamental design for gas sensor, as shown and described.
1. Gas sensor
2. Gas sensor
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Right
1.6 : Top
1.7 : Bottom
1.8 : Cross sectional
2.1 : Perspective
2.2 : Front
2.3 : Back
2.4 : Left
2.5 : Right
2.6 : Top
2.7 : Bottom
2.8 : Cross sectional
In the reproductions, the broken lines illustrate unclaimed portions of the articles and form no part of the claimed designs; the dash-dot broken lines illustrate only the boundary between the claimed designs and the other portions of the articles; the portion of the gas detectors indicated by the oblique shading lines in the reproductions Nos. 1.3 to 1.5 and 1.7 of design No. 1 and 2.3 to 2.5 and 2.7 of the design No. 2 represents a translucent surface; the solid black surface shading in the reproductions Nos. 1.1 to 1.7 of design No. 1 represents the color black; the reproductions Nos. 1.8 and 2.8 partially illustrate cross-sectional views of the front panel, which are taken along the vertical line extending through the middle of the gas detectors in the front views; hatched areas in the cross-sectional views represent cross-sections of the subject articles.