Systems and methods of chemical sensing in fuel cell systems are described. In one aspect, a replaceable sacrificial sensor system includes an input that is configured to be coupled to a fuel stream delivery system, two or more sacrificial chemical sensor fuel cells, and a manifold that is configured to selectively couple the sacrificial chemical sensor fuel cells to the input. In another aspect, a fuel cell system includes a main fuel cell, a fuel stream delivery system that is configured to direct a fuel stream to the main fuel cell, an oxidant stream delivery system that is configured to direct an oxidant stream to the main fuel cell, and a sensor system. The sensor system is coupled to the fuel stream delivery system at a location upstream of the main fuel cell and includes two or more sacrificial chemical sensors and a manifold that is configured to selectively couple the sacrificial chemical sensors to the fuel stream delivery system. A fuel cell monitoring method also is described.
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