Abstract: In one embodiment, a touch input device has a flame and explosion resistant enclosure supporting a display device which is observable from outside the enclosure. The touch screen input device comprises a frame attachable to an axial end of the housing. A transparent window is receivable in the frame for securement to the housing to form an end of the enclosure and defining a view port for viewing the display device. An interface between the window and the frame defines a flame suppressing path extending continuously about the periphery of the interface. A light emitting device is located within the enclosure for directing a beam of light through the window. A first reflector is located on a side of the window opposite the light emitting device for reflecting the beam of light across the view port.