Series 25 Heavy Duty Rugged Housing Shaft Encoders Protected Against Seawater and Tropical Climates Anodized aluminum or nickel-plated housing Rugged housing with protection class up to IP68 Protects against contamination by dust and liquids. Models for use in hazardous environments are ATEX certified. Precise photoelectric or magnetic sensing technology, good electromagnetic compatibility Up to 16384 P/R pulses per revolution Over-voltage, over-current, surge protection Rugged metal housing, double bearing design, protection class up to IP68 Reverse short-circuit and short-circuit protection to minimize the impact of installation errors on the encoder.