This is the engineering summary of an open reference architecture. The paper, its object model as JSON and the model register are free to reuse under CC BY 4.0: https://muhammadumar89.github.io/codeninja-research/factory-fire-monitoring-saudi-arabia/ . The operator is described by class, never by name. An operator of industrial cities in Saudi Arabia has a factory estate in the thousands, a hundred of them classed high risk. Fire alarm panels, fire pumps, fire water tanks and energy meters ...