All Field Analog temperature transducers are 2-wire transmitters. You do not need a separate power supply, as the products are supplied with power directly via the 4 mA ... 20 mA measuring line. This reduces wiring effort.
Ex i-Output loop-powered temperature transducer for transmitting RTD and TC sensor signals as well as from resistance and voltage sensors via 4 mA ... 20 mA. HART, Ex i signal conditioners, Standard configuration, Screw connection