What is Zener vs Galvanic Isolation in Intrinsic Safety Loops Intrinsic safety loops using 4 to 20 mA signals are widely used to keep instrumentation circuits safe in hazardous atmospheres. The choice between a Zener barrier and a galvanic isolator affects grounding practice, available loop voltage, diagnostics, maintenance and long term reliability. This article provides … Continue reading Understanding Zener vs Galvanic Isolation in IS Loops for 4 to 20 mA Systems