WORLD-BEAM QS18 Universal Voltage sensors include compact housing that has 18 mm threaded barrel or basemount, side-mount, and retrofit bracket options. They offer 20–140 Vac/dc or 20–270 Vac/dc operation with P-MOSFET (sourcing)/N-MOSFET (sinking) solid-state output. Sensing modes include opposed pair, retro-reflective, polarized retro-reflective, diffuse, and long range diffuse models for sensing up to 1 m.