c3controls makes several types of proximity sensors including inductive, capacitive, and cylindrical models, rated for type 1, 2, 3, 3R, 4/4X, 6, 6P, 12, 13, and IP67 applications.

OMRON Corp manufactures several types of proximity sensors including capacitive, cylindrical, separate amplifier, and rectangular models for high temperatures, cleaning processes, long and short distance detection, splatter resistant models, and more.

Panasonic makes cylindrical, inductive, and rectangular proximity sensors including high-stability, miniature, top sensing, 3-wire, compact, and 2-wire models.