The small (5 7 in.) sensors have a scratch-resistant spherical sapphire lens that projects a cylindrical light beam with a <4-mm diameter for vertical or horizontal mounting. The selfcontained devices are short-circuitproof, operate at 10 to 30 Vdc, have a 100-mA output current, and are fully vacuum potted.

Contrinex Inc., 2 Business Park Rd., Old Saybrook, CT 06475, (866) 289-2899,