Phoenix Contact 1291191 An ex-i-Feed and input signal conditioner is used to feed and condition measuring transducers with 2-, 3- or 4-conductor configurations. It can transmit signals at a ratio of 1:1, either passively or actively, up to 20 mA. This device also handles active non-ex i input signals while producing an ex i output signal. The standard configuration features three-way isolation and can be configured in one channel, making it HART-transparent. Additionally, this unit operates at a Safety Integrity Level (SIL) of 3, adhering to IEC 61508 standards, and is equipped with screw connections for easy installation.