Phoenix Contact 1157852 The ex-i-NAMUR signal conditioner is designed for use in areas where explosive gases are present, such as Ex zones. It transmits signals from proximity sensors and switches to a safe area through two transistor outputs that are passive, meaning they do not require any power source to operate. The standard configuration of this signal conditioner includes line fault detection, which ensures the system remains functional even if there is an issue with the circuitry. Additionally, it meets safety standards for SIL levels 3, as required by IEC 61508, and features screw connections for easy installation and maintenance.