Specs at a glance Input: 0/4…20 mA / HART feeding/not feeding Output: 0/4…20 mA / HART active/passive Power Supply: 24 V DC ---------------------------------------- Field of application Endress Hauser's The 1- or 2-channel RN22 active barrier powers analog instrument loops and safety instrumented systems up to SIL 2 (SC 3). The intrinsically safe, HART® transparent interface establishes a reliable link between field devices and process control. It interfaces with 2-/4-wire devices in hazardous areas and provides a second galvanically isolated signal output acc. to NAMUR NE 175. This opens a second channel for the process optimization domain without affecting the traditional automation system. • Single- or two-channel active barrier, power supply or signal doubler • 0/4 to 20 mA analog signal transmission (NAMUR NE 43) and galvanic isolation • Intrinsic safety for operation in hazardous areas (Zone 2) • Bidirectional HART® communication (transparent) • 2- and 4-wire capability for instruments in hazardous areas (Zones 0/20) • Ambient temperature range: -40 … 60 °C (-40 … 140 °F)