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Measuring principle

Isolated barriers are a combination of an intrinsic safety zener barrier and a galvanic isolation network. The energy limitation delivered to the fi eld (voltage and current) is achieved through the zener barrier. In simple terms, a zener barrier contains a zener diode for voltage limitation and a resistor for current limitation.These components are protected with a fuse.
The galvanic isolation contained within the isolated barriers prevents noise,potential eff ects and transients from aff ecting the measurement signals. Although necessary for stand-alone, zener barriers, an isolated barrier does not require a connection to earth (ground). Separating instruments separate intrinsically circuits from nonintrinsically safe circuits.

Application guidelines
Isolated barriers for intrinsic safety applications are used in factory and process control for the galvanic isolation of control and instrumentation signals, such as NAMUR sensors, 4 mA to 20 mA and 0 V to 10 V signals. These devices are also used to convert specialized measurement signals into standard control signals. Isolated barriers have intrinsically safe control circuits in order to operate and communicate with fi eld devices in hazardous areas..
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