Panasonic sf4b series type 4 light curtains hand protection panasonic sf4b h28v2 this 28 beam advanced light curtain has a protective height of 550mm and is designed to be part of a hand protection safety system the universal design can be used anywhere in the world and supports both pnp and npn outputs in a single model the unit has improved environmental resistance performance and enhanced operability and is equipped with a digital error indicator that makes it easy to diagnose problems