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SAFETY BARRIERS
Safety Barriers also referred to as zener barriers, are passive devices which contain zener diodes, resistors and fuses to limit excess voltage and current.
These are the basic building blocks which are contained in all other intrinsically safe barriers.
There is always a voltage drop across zener barriers because of the resistors so some selection is required as well as a ground connection. This selection has been greatly simplified as demonstrated in the application section.
Grounded barriers are also very versatile and can be applied in many other applications. Safety barriers are the smallest devices, have the lowest initial product cost but require costly field wiring and ground connections.
Advantages:
lowest initial cost per unit
very precise signal response
small power requirements
versatile for “other” circuits
Other considerations:
requires high integrity ground
barrier resistance can influence circuit function
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