Dual Circuit System (Electronic Only)

A dual circuit system may be simply parallel component series circuits, but variations can be endless. The most reliable system would comprise two completely redundant parallel single circuits, from sensors through and including redundant final trip valves.

The advantage of a dual circuit system is that if a single component fails the other component will continue to function. In fact, one system can be tested independently of the other. The disadvantage is the increased number of components and the consequent increased maintenance and testing.

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