Process interface, with intricately output insurance, 0/4 ... 20mA, Input signal 0/4 ... 20 mA with HART Communication Bidirectional, load up to 75 Ohms, supply 20 ... 30Vdc, Certificates [Ex ia ] IIC, TÜV00ATEX1524, PI-Ex-ME-IDS-Line I / I, Phoenix.