The Weidmüller ACT20X-2SDI-2HDO-S is a 2-channel intrinsically safe isolating converter designed to control pneumatic or hydraulic valves, solenoids, and alarm transmitters located in hazardous areas (Ex zone 0, 1, 2). It receives switching signals (NPN or PNP) from the safe area and provides a digital, intrinsically safe output to the field in Ex zone 0.