The encapsulated, pressure-proof encoder operates on the optical sensing technique and depending on the product variant provides 250 to 2.500 impulses/turn. Inner through-hollow shaft diameters from 30 to 70 mm, high bearing load capacity of 650 N radial, and 450 N axial ensure maximum service life. The housing reliably protects the encoder against adverse ambient conditions, and the large terminal box enabling four different mounting positions will considerably ease electrical installation.