4 channels, Inputs Ex ia, Mounting in Zone 2, Class I/Div.2 or in the safe area, Converter for 2-, 3- and 4-wire RTDs (Pt100 ... Pt1000), slide wire sensors etc., Explosion protection: Ex ia, Field device: resistance thermometer, Field device [2]: slide-wire sensors, Field device [3]: potentiometer, Connection: 2-wire sensor, Connection [2]: 3-wire sensor, Connection [3]: 4-wire sensor